JP2000034663A - Sheet for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheet for cleaning excellent in surface strength without causing the falling off of fibers at the time of cleaning and excellent in properties of collecting dust such as hair according to a low-cost and simple method for production. SOLUTION: This sheet for cleaning comprises a layer forming at least a cleaning surface and comprising a nonwoven fabric formed by thermally fusing a fibrous web prepared by mixing thermally fusible fibers with thermally nonfusible fibers without fusing at a temperature within the range of a fusing temperature of the thermally fusible fibers at a temperature within the range of the fusing temperature of the thermally fusible fibers. The nonwoven fabric has 0.15-0.95 N/(13 mm×30 mm) shearing peel force of a mechanical fastener expressed in terms of average value of 5-point average load of a peeling mode measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning sheet which has a small amount of fibers falling off and is excellent in collecting dust such as hair.

[0002]

2. Description of the Related Art Various cleaning sheets made of non-woven fabric have been proposed which are attached to a floor cleaning tool or the like and are mainly used in a dry state to collect dust and hair and other dust. . Nonwoven fabrics manufactured by the hydroentanglement method have conventionally been used for the cleaning sheet, but the hydroentanglement method increases the manufacturing cost. In addition, when performing secondary processing by heat for shape processing, strength improvement, etc., a heat fusible fiber may be added, which causes further problems such as higher cost and reduced dust collecting ability. was there.

A cleaning sheet made of a non-woven fabric made of heat-fusible fibers by a heat bonding method has been conventionally used. However, if the fibers fall off the sheet and remain on the cleaning surface, or if the fibers fall off, the fibers are removed. The balance between cleaning performance and surface strength, such as impairing dust collection, has been a problem.

Accordingly, an object of the present invention is to provide an excellent surface strength, no loss of fibers during cleaning, excellent collection of dust such as hair, and cleaning by an inexpensive and simple manufacturing method. To provide a sheet for use.

[0005]

Means for Solving the Problems The present inventors have formed a cleaning surface layer so as to have a specific strength by heat-treating a fiber mixture in which heat-fusible fibers and non-heat-fusible fibers are mixed. It has been found that a cleaning sheet made of a nonwoven fabric can solve the above problems.

According to the present invention, at least a layer forming a cleaning surface is formed by mixing a heat-fusible fiber with a non-heat-fusible fiber which does not fuse at a temperature within a fusion temperature range of the heat-fusible fiber. A nonwoven fabric formed by heat-sealing a fiber web in the temperature range of the heat-fusible fibers. The nonwoven fabric has a shear release force of a mechanical fastener and an average load of 5 points measured in a release mode. 0.15 to 0.95 N / (13 mm × 30
mm).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cleaning sheet of the present invention has at least a layer forming a cleaning surface (hereinafter, referred to as a "cleaning surface layer").
Is formed of a specific nonwoven fabric. The cleaning surface is a surface located at a position where the cleaning sheet comes into contact with the surface to be cleaned when the cleaning sheet of the present invention is mounted on the cleaning tool.

[0008] Examples of the heat-fusible fibers used in the fibrous web include monofilament fibers and conjugate fibers having a parallel structure or a core-sheath structure comprising a low-melting component and a high-melting component. Specific examples of the components constituting the composite fiber include the following components. In addition, as a component in the case of a single type fiber, ordinary polypropylene (PP) or the like can be used in addition to the low melting point component described below. As the low melting point component, a low melting point component having a melting point of 100 to 220 ° C. is preferable,
Specifically, polyethylene (PE), polybutene and a copolymer of ethylene and / or butene and an α-olefin;
Low melting point PP such as block copolymer, random copolymer or graft copolymer known as a copolymer of propylene and α-olefin; at least one part of terephthalic acid units in polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) And a component such as a low-melting polyester substituted with a dicarboxylic acid. The low melting point component may be a blend of two or more components.
As the high melting point component, a component having a melting point of 160 to 260 ° C. is preferable. Specifically, for example, PET, PB
Polyesters such as T; PP; methylpentene copolymer;
Preferable examples include polyamides such as nylon 6 and nylon 66. In the fiber having a core-sheath structure, the high melting point component is a core component forming a core, and the low melting point component is a sheath component forming a sheath.

The melting point of the high melting point component is preferably higher by 20 to 150 ° C. than the melting point of the low melting point component. As a preferable combination of the low melting point component and the high melting point component, (low melting point component / high melting point component) includes low melting point PP / PET, PE / PET, PE / PP, or the above low melting point PET / normal. PET, nylon 6 / nylon 66
And the like. The mixing ratio of the low melting point component and the high melting point component in the composite fiber is such that the high melting point component is 20 to 80 parts by weight with respect to the low melting point component of 80 to 20 parts by weight.
Parts by weight (the total amount of both is 100 parts by weight).

[0010] The fusion temperature of the heat-fusible fibers (the temperature at which the fibers are fixed to each other by the fusion of the fibers) is 110 to 150.
C. is preferred. The fineness of the heat-fusible fiber is
It is preferably from 0.5 to 4d, more preferably from 0.5 to 3d. The length of the heat-fusible fiber can be used without any limitation as long as it is used for ordinary nonwoven fabric production.
00 mm is preferable, and 25 to 75 mm is more preferable.

The non-heat-fusible fiber used in the fiber web is a fiber that does not fuse within the fusion temperature range of the heat-fusible fiber. (Referred to as a non-heat-fusible component). The non-fusible component is preferably contained in an amount of at least 30 wt%, more preferably at least 50 wt%, of the entire fiber. Examples of the non-heat-fusible component include polyester components such as PET and PBT, rayon components, cupra components, acetate components such as acetate and triacetate, polyamide components such as nylon 6 and nylon 66, and polyacryl such as acrylic. Examples thereof include a nitrile-based component and a fluorine-based component, but are not particularly limited thereto. It is also possible to use a combination of two or more of these.

When the non-heat-fusible component has a fusion temperature, the fusion temperature is not particularly limited as long as it is higher than the melting point of the low-melting component in the heat-fusible fiber. Is preferred. When the non-heat-fusible component does not have a fusion temperature, the non-heat-fusible component only needs to be chemically stable at least at the fusion temperature of the heat-fusible fiber used.
It is preferably chemically stable even at a temperature 20 ° C. or higher than the fusion temperature of the heat-fusible fiber used. In addition, the fineness of the non-heat-fusible fiber is preferably lower, and in practice, in the case of a non-split synthetic fiber, it is preferably 0.5 to 3.0 d. Similarly, even in the case of a synthetic fiber of a split type, it is preferable that the synthetic fiber has a finer fineness. The length of the non-heat-fusible fiber is preferably 10 to 100 mm, and is preferably 25 to 7 mm.
More preferably, it is 5 mm.

The mixing ratio of the heat fusible fiber and the non-heat fusible fiber is preferably in a weight ratio of heat fusible fiber / non-heat fusible fiber = 55/45 to 95/5. And more preferably, heat fusible fiber / non-heat fusible fiber = 60/40 to 90.
/ 10. The blending ratio of the heat-fusible fiber is preferably 55 or more in terms of tensile strength of the obtained sheet-like material and breakage of the sheet when used as a cleaning sheet, and the performance as a cleaning sheet, particularly the capture of hair. 9 in terms of collection performance
It is preferably 5 or less.

[0014] The non-woven fabric is made of the fibrous web (a mixture of the heat-fusible fibers and the non-heat-fusible fibers).
Is thermally fused. The above "heat fusion"
A fiber web uniformly mixed according to a conventional method at the above mixing ratio can be produced by thermocompression bonding between a pair of heated rolls, or can be formed on the same fiber web by 110 to 220.
It may be performed by blowing hot air at a temperature of 0.5 to 3 m / s for 5 to 15 seconds. Specifically, the thermocompression bonding conditions are preferably performed at 110 to 220 ° C., but are preferably changed as appropriate depending on conditions such as the processing speed and the basis weight of the web.

In the nonwoven fabric, intersections formed by the heat fusible fibers are fused. The “intersection” means an intersection between the heat-fusible fiber and the heat-fusible fiber or the non-heat-fusible fiber. That is, the intersection of the non-heat-fusible fibers does not fuse,
Most of the intersections of the heat-fusible fibers are fused,
The intersection of the heat-fusible fiber and the non-heat-fusible fiber is also fused by the action of the heat-fusible fiber. Then, strength is developed by these fused intersections (hereinafter, these intersections are referred to as “fused intersections”). In addition, it is preferable that all the intersections are fusion intersections.However, if a specific shearing peeling force is satisfied, the degree of fusion is low, or fusion is removed in a post-fusion step. There may be intersections that are not fused. In the method in which the fibrous web is thermocompression-bonded between a pair of heated rolls, the above-mentioned fusion intersection partly occurs. In other words, there is a state where a portion where the fusion intersection exists and a portion where the fusion intersection does not exist are mixed. In the method of blowing hot air onto the fibrous web, the fusion intersection points are present evenly throughout the nonwoven fabric in both the width direction and the thickness direction. The fusion intersection may be partially present in a part of the nonwoven fabric as long as a specific shear peeling force is satisfied, and is more preferably present over the entire nonwoven fabric.

The non-woven fabric has a mechanical fastener having a shear release force of 0.15 to 0.95 N / (13 mm × 30 mm), preferably 0.25 to 0.5 N, as an average value of the five-point average loads measured in the release mode. 65N / (13mm × 30mm)
It is. The mechanical fastener is measured using a hook-shaped convex member of "mold magic regular type HTH823" (trade name, manufactured by Kuraray Co., Ltd.) having a width of 13 mm.
Details of the measuring method will be described in the examples section below.
The mechanical fastener of the nonwoven fabric has a shear release force of 0.9
If it exceeds 5 N / (13 mm × 30 mm), the strength (breaking strength) of the surface of the finally obtained cleaning sheet is reduced, and the possibility that fluff or the like dropped off from the cleaning sheet remains on the surface to be cleaned is increased. . On the other hand, 0.15N (13mm ×
If it is lower than 30 mm), the dust collecting property is reduced.

The density of the nonwoven fabric is 40 to 65 kg / m
It is preferably ³ , and more preferably 45 to 55 kg / m ³ . The density is preferably 40 kg / m ³ or more from the viewpoint of surface strength and the strength as a nonwoven fabric, and is preferably 65 kg / m ³ or less from the viewpoint of dust collection. Further, the basis weight of the nonwoven fabric is preferably from 10 to 100 g / m ² , and more preferably from 20 to 60 g / m ² .

The non-woven fabric is a non-woven fabric comprising only the non-heat-fusible fibers used in the non-woven fabric (hereinafter referred to as "non-fusible non-woven fabric").
In this case, this nonwoven fabric is shown).
The bonding strength when bonded at 0 ° C. for a sealing time of 5 seconds is preferably 1.5 N / 30 mm or less, more preferably 1.
0 to 0.3 N / 30 mm. Also, set the sealing time to 1
Except for 0 seconds, the bonding strength when bonded similarly,
It is preferably 2.2 N / 30 mm or less, and 1.8 to
More preferably, it is 0.4 N / 30 mm. Since the non-fusible nonwoven fabric is formed by a fibrous web obtained by removing the heat-fusible fibers from the nonwoven fabric, when two or more types of non-fusible fibers are used in the nonwoven fabric, these fibers are not The mixture is mixed at the same ratio as the mixing ratio in the nonwoven fabric. The basis weight of the non-fusible nonwoven fabric is 0.8 to 2.0 times the basis weight of the nonwoven fabric. In addition, the non-fusible nonwoven fabric is preferably manufactured by a method that does not receive heat history. In addition, the detailed measuring method of the adhesive strength will be described later in the section of Examples.

The above-mentioned adhesive strength indicates the state of fibers on the surface of the sheet, and is preferably in the above range in terms of the ability to collect long fibrous dust such as hair and the like, and the ability of fibers to fall off from the sheet.

A preferred embodiment of the cleaning sheet of the present invention is formed by bonding two rectangular nonwoven fabrics, and the front surface and the back surface are cleaning surface layers. The cleaning sheet of this embodiment can be used by attaching it to a commercially available floor cleaning tool (manufactured by Kao, trade name "Quickle Wiper").

The cleaning sheet may have a single layer or a structure of two or more layers obtained by laminating the nonwoven fabric and another nonwoven fabric, provided that at least one surface is a cleaning surface. As another nonwoven fabric, a nonwoven fabric formed of 100% of the above-mentioned heat-fusible fiber is exemplified. The weight ratio of the nonwoven fabric to the other nonwoven fabric is preferably 10:90 to 90:10, and the basis weight of the other nonwoven fabric is 5 to 45.
g / m ² is preferred. It is also possible to insert a net made of PP or the like between nonwoven fabrics.

The cleaning sheet of this embodiment can be manufactured by using the manufacturing apparatus shown in FIG. Manufacturing apparatus 100 shown in FIG.
Is a first card 1 that supplies the spread fiber supplied from a spread unit (not shown) to the conveyor 101 as a fiber web.
10 and the second card 120, a heat treatment apparatus 130 for heat-treating the laminated fiber web (laminated body 1 ″) supplied from the first card 110 and the second card 120, and pressurizes the heat-treated laminated body 1 ″. The cleaning device includes a pressing device 140 and a winding unit 150 that winds the continuous body 1 ′ of the cleaning sheet manufactured by pressing.

Then, it is produced as follows. First, the raw fiber of the heat-fusible fiber and the non-heat-fusible fiber mainly supplied in a bale state is spread from the aggregated state by the fiber opening unit to a state in which a web can be formed (spread fiber), The heat-fusible fibers and the non-heat-fusible fibers are mixed at a mixing ratio of.
Next, the mixed opened fiber is supplied to the first card 110 and the second card 120 to form a fiber web, respectively. The first card 110 and the second card 120
May be supplied with different fibers.

The fiber web (laminated body) supplied from the first card 110 and the second card 120 and laminated is supplied to the heat treatment apparatus 130 by the conveyor 101, and subjected to the above heat treatment under the above-described conditions. The intersections formed by the heat-fusible fibers are heat-sealed. After the heat treatment is completed, the entire laminate is subjected to a weak pressurizing treatment by the pressurizing device 140, and then the continuous body of the obtained cleaning sheet is taken up by the take-up unit 150. The conditions of each of the above treatments vary depending on the type of the heat-fusible fiber.
The pressure is preferably 3 to 100 N / m. Further, in the present invention, an embossing treatment can be further performed for improving the appearance of the cleaning sheet, integrating two or more nonwoven fabrics, and the like.

The above non-woven fabric, if it satisfies the specified physical properties,
It may be manufactured by a method other than the above manufacturing method.

[0026]

Next, examples and comparative examples will be described. [Example 1] As the heat-fusible fiber, the high melting point component (core component) is composed of PP, the low melting point component (sheath component) is composed of low melting point PP, and the ratio of the high melting point component to the low melting point component is expressed by weight. 50 /
A core-sheath structure fiber “PR” (trade name, manufactured by Ube Nitto Kasei Co., Ltd.) having a size of 2.0 denier (d) × 51 mm, which is 50, and a non-heat-fusible fiber of 0.8 d × 38 m
A polyester (PET) fiber “Teijin Tetron” (trade name, manufactured by Teijin Limited) having a size of m was used. The ratio between the heat-fusible fibers and the non-heat-fusible fibers is 4 by weight.
Each spread fiber was obtained from the spreader so as to be 0/60, and a fiber web for forming a cleaning surface was formed by the first carding machine while mixing so that the mixing ratio was constant. Separately, the core component is made of PP and the sheath component is made of low melting point PP, and the weight ratio of the core component / sheath component is 50/50 and 2.0 d × 51 m.
A non-cleaning surface fibrous web consisting of 100% of the heat fusible fibers was prepared by a second carding machine. The obtained webs were overlapped and laminated, and the laminated sheet was heat-treated with 147 ° C. and hot air having a wind speed of 12 m / s for 6 seconds. Further, when the heat-fusible fiber still has an adhesive ability (immediately after the hot air treatment),
A linear pressure of 8.7 N / m is applied to the entire laminated sheet, and the basis weight is 25.
g / m ² of nonwoven fabric was obtained. The weight ratio between the fiber web for forming the cleaning surface and the fiber web for forming the non-cleaning surface is 30 /.
It was adjusted to be 70.

Next, the nonwoven fabric obtained by the above method is further superimposed so that the non-cleaning surfaces are in contact with each other and each cleaning surface is an outer surface so as to be suitable for a cleaning sheet, and a visual impression is obtained. Embossing (secondary processing) to improve the quality
Was given. In detail, a roll (heating, about 130 mm) in which a grid-shaped embossing pattern of 8 mm × 8 mm arranged in a direction in which fibers are arranged in the nonwoven fabric and a direction perpendicular thereto is imprinted.
° C) and a roll without metal pattern (heating, about 60
(° C.)) to form a lattice (MD direction × CD direction) embossed pattern on the sheet. The pressure at this time is 980 kP
a, and the obtained cleaning sheet was obtained by subjecting the nonwoven fabric to 2PLY, so that the basis weight was 50 g / m ² .

Example 2 As the heat-fusible fiber, a core-sheath structure fiber "HR" (trade name, manufactured by Ube Nitto Kasei Co., Ltd.) shown in Table 1 was used. Using PET fiber "Tetron staple" (trade name, manufactured by Toray Industries, Inc.) shown in Table 1, the ratio of the heat-fusible fiber to the non-heat-fusible fiber is 85/15 by weight. Thus, each fiber was obtained from a fiber opening machine, and a fiber web was produced with a first carding machine while mixing so that the mixing ratio was constant. Similarly, the same fibrous web is produced by the second carding machine and laminated into two layers (the weight ratio of each layer [hereinafter, simply referred to as “ratio” is 1: 1): 142 ° C. Wind speed 1-2m
/ S of hot air for 6 seconds. Next, two sheets of the obtained nonwoven fabric were further laminated so as to be suitable for a cleaning sheet, and embossing was performed in the same manner as in Example 1 to improve a visual impression and to integrate the two sheets. The pressure at this time is 600k
Pa, and the obtained cleaning sheet is made of the above nonwoven fabric by 2
Although it was PLAYed, it shrank slightly due to embossing, and the basis weight was 51 g / m ² .

Example 3 As a heat-fusible fiber, a core-sheath structure fiber "TPC" (trade name, manufactured by Chisso Corporation) shown in Table 1 was used. 1) PET fiber "Tetron staple" (trade name, manufactured by Toray Industries, Inc.) as shown in [1] above, so that the ratio of the heat-fusible fiber to the non-heat-fusible fiber is 70/30 by weight. Each fiber was obtained from a fiber opening machine, and a fiber web was produced while mixing so that the mixing ratio was constant. This fiber web is laminated into two layers (the ratio of each layer is 1: 1), 147 ° C., wind speed 1-2 m /
s for 6 seconds to obtain a nonwoven fabric. Further, when the heat-fusible fiber still has an adhesive ability (immediately after the hot-air treatment), a linear pressure of 9 N / m is applied to the entire laminated body of the sheeted fiber web, and a basis weight of 24 g composed of two layers of nonwoven fabric / M ² of the cleaning sheet.

Example 4 A single fiber of PP shown in Table 1 (2.0 d × 40 mm) was used as the heat-fusible fiber, and a non-heat-fusible fiber having a size of 0.8 d × 38 mm was used. PET fibers of "Teijin Tetron" (trade name, manufactured by Teijin Co., Ltd.), and these were mixed so that the ratio of the heat-fusible fibers to the non-heat-fusible fibers was 80/20 by weight. Was obtained from a fiber opening machine, and a fiber web was produced while mixing so that the mixing ratio was constant. The fibrous web is laminated into two layers (the ratio of each layer is 1: 1) to form a sheet by thermocompression bonding between rolls. Embossing temperature / Flat roll temperature, using an embossing roll in which diamond-shaped projections having a diagonal angle of 1 mm are engraved with patterns arranged at intervals of CD, 1 mm, and MD: 0.5 mm, and a metal flat roll = 150 ° C / 150 ° C, sheeted, basis weight 20g
/ M ² was obtained. Next, the obtained nonwoven fabric was subjected to embossing under the same conditions as in Example 1 in order to further improve the visual image and enhance the surface strength so as to be suitable as a cleaning sheet. The obtained cleaning sheet is made of the above nonwoven fabric by 2P.
Since it was made LY, the basis weight was 40 g / m ² .

Comparative Example 1 The same heat-fusible fibers as in Example 2 and the same non-fusible fibers as in Example 1 were used.
Each fiber was obtained from an opener so that the ratio of the heat-fusible fiber to the non-heat-fusible fiber was 70/30, and a card-like fiber web was produced while mixing so that the mixing ratio was constant. .
(No pressure applied) Two obtained fiber webs were laminated to form a laminate (the ratio of each layer was 1: 1).
The sheet was treated with hot air at 2 ° C. and a wind speed of 1 to 2 m / s for 6 seconds to obtain a cleaning sheet having a basis weight of 25 g / m ² .

[Comparative Example 2] PET fiber "Teijin Tetron" (trade name, manufactured by Teijin Limited) shown in Table 1 was used as the heat-fusible fiber and the non-heat-fusible fiber as in Example 1. Each of these fibers is obtained from a fiber opening machine such that the ratio of the heat-fusible fibers to the non-heat-fusible fibers is 50/50 by weight, and is mixed and cleaned so that the mixing ratio is constant. A fiber web for the face was made. On the other hand, the fiber web (heat-fusible fiber 100 w
t% web). These two types of fiber webs are laminated in two layers (the ratio of each layer is 1: 1), 147 ° C.,
The treatment was performed with hot air having a wind speed of 1 to 2 m / s for 6 seconds. As a result, a nonwoven fabric having a basis weight of 20 g / m ² consisting of two layers of fiber web was obtained. Next, two sheets of the obtained nonwoven fabric are further laminated so as to be suitable for a cleaning sheet, and in order to improve a visual impression, the two fiber webs for the cleaning surface of each nonwoven fabric are directed outward. Laminating two non-woven fabrics, passing between the embossing roll (heating, about 130 ° C.) and the flat roll (heating, about 60 ° C.) with zero clearance, embossing, and forming a grid-like emboss pattern On the sheet. On the embossing roll, an 8 mm × 8 mm lattice-shaped (MD direction × CD direction) pattern arranged in the direction in which fibers are arranged in the nonwoven fabric and in the direction perpendicular thereto is imprinted. The pressure at this time was 600 kPa, and the cleaning sheet obtained
Although it was Y-shaped, shrinkage occurred slightly due to embossing, and the basis weight was 40 g / m ² .

In each of the examples and comparative examples, the shear-peeling force of the mechanical fastener was measured for the nonwoven fabric forming the cleaning surface as follows. The adhesive strength at a sealing temperature of 160 ° C. of the non-fusible nonwoven fabric having a basis weight of 37 g / m ² , which was obtained by a water needle manufacturing method comprising only the non-heat-fusible fibers used in these nonwoven fabrics, was determined as follows. Was measured by the seal test. The results are shown in Table 1
It is shown in [Table 2].

<Measurement Method of Shear Peeling Force> The obtained nonwoven fabric was used as a concave material, and a tape having a width of 13 mm comprising a key portion 210 and an arc-shaped raised portion 220 shown in FIG. 2 [“Mold magic regular type” HTH823 "(trade name, manufactured by Kuraray Co., Ltd.) was used as the hook-shaped convex member 321 of the mechanical fastener. Then, as shown in FIG.
Has a size of 50 x 50 mm, and is about 130 x 50 mm
The sheet is made of a closed-cell foam of chloroprene rubber having a thickness of 3 mm and has a hardness [JIS K6301, vulcanized rubber physical measurement method, spring hardness test (A type)] of 30. Width 50mm so that the tip does not protrude according to the side (130mm direction)
The two are adhered to each other by using the double-sided tape 312 to form a concave material set 310. At this time, the nonwoven fabric is set so that the exposed surface is the surface forming the cleaning surface. On the other hand, as shown in FIG. 4, a double-sided tape 322 having a width of 15 mm
The hook type convex member 321 of 3 × 30 mm is bonded. Thereafter, the copy paper is cut into a size of about 113 × 30 mm. At this time, the hook type convex member 321 is adhered so that the MD direction is along the 30 mm direction (width direction) of the copy paper 323 to form the convex member set 320.

Next, as shown in FIG.
The hook-shaped convex member 321 of FIG. 20 abuts on the portion of the concave material set 310 to which the nonwoven fabric 311 is adhered, slightly apart from the tip of the nonwoven fabric 311 (overlapping) (at this time, the hook-shaped convex member also adhered). Must not protrude from the non-woven fabric), 1 kg of its own weight and 30 mm in width
Non-woven fabric 311 and hook-shaped convex member 32 using rollers of
The two are mechanically fastened by making one reciprocation on a portion where the two overlap. Next, the nonwoven fabric 31 of the concave material set 310 is attached to a lower chuck of a measuring machine (“Tensilon RTM-25”, manufactured by Orientec Co., Ltd.).
1 and the end 313a of the copy sheet 323 without the hook-shaped convex member 321 of the convex member set 320 is attached to the upper chuck by gripping the end 313a of the sheet 313 having no 1 and the both are 5 mm / s (300 mm / min), and the force required to peel the hook-shaped convex member from the cleaning sheet is measured. The same operation was repeated 10 times to obtain measurement data at 10 points, which were obtained by using Orientec Co., Ltd. peel test mode data processing software (trade name, MP
-100 (MS-DOS) Ver. Data processing was carried out using 43.1), and the average value of the five-point average loads was defined as the shear peel force.

<Seal test> ・ Sheet size; MD × CD = about 50 mm × about 100 m
m-Seal direction: CD direction of each sheet (the seal strength is hard to be obtained).・ Seal strength tester: Sealing time (in 0.1 second increments) and sealing temperature (in 1 ° C increments) can be controlled. As a structure, the upper bar moves, and the sample is sandwiched between the fixed lower portion (base portion) and sealing is performed. The upper bar is convex and its width is 5.5 mm. The actual seal is 0.1 mm thick to prevent the sample from sticking to the top bar.
A 080 mm (.about.0.075 mm) sheet made of fluorine coated glass fiber (Norton Co., Ltd., PTFE coated glass cloth # 5310) is placed on the uppermost part, and a sample is made of a water needle nonwoven fabric (described above).
(Base) in order, sealing pressure is 294 kPa
(3 kgf / cm ² ). The temperature is applied only to the upper bar having the convex portion, and the lower portion is kept at room temperature.

<Comparison of Performance> The cleaning sheets of the examples and comparative examples were evaluated as follows with respect to the following three points required as the basic performance of the cleaning sheet. The results are shown in [Table 1] and [Table 2]. 1. The sheet does not break significantly during use (breaking strength). 2. Sufficiently remove dirt to be cleaned (dust collection). 3. Do not leave sheet fibers on the object to be cleaned (fiber shedding).

1. Breaking strength A sample having a width of 30 mm was cut out in the orientation direction of the fibers of the cleaning sheet, and this sample was gripped by a tensile tester (Tensilon tensile tester) at a distance between the chucks of 100 mm, and the orientation direction of the fibers (MD of the sheet). Direction) to 3
The sheet was pulled at a speed of 00 mm / min, and a load value (first peak value of a continuous curve obtained by this measurement) when the sheet started to be cut was measured and evaluated according to the following evaluation criteria. Evaluation criteria: （(no break during use); 14.0 N / 30 mm
○ (No break during use); 13.9-8.0N /
30 mm △ (may break during use); 7.9 to 6.0 N
/ 30mm × (breaks easily. Unusable); 5.9N / 30mm
In the following, a plurality of measurements (10 times) were performed, and when these were straddled between different evaluations, they were expressed by using (for example, △ to △).
X etc.).

2. Dust collection performance The hair collection performance obtained by the following method is used as an index of the dust collection performance. The cleaning sheet is mounted on a cushion material having a surface of 7 cm × 10 cm with the MD of the sheet corresponding to the 10 cm direction of the cushion material. Five straight hairs, cut lengths of 100 mm (about 100 μm diameter), and commercially available flooring (Woody tile MT6 manufactured by Matsushita Electric Works, Ltd.)
13T, surface roughness (grain direction: 1.95 μm), and the cushion material is wiped back and forth five times in the 7 cm direction with a load of 200 g and a stroke of 30 cm. The number of hairs that are sufficiently entangled with the sheet is taken as the number of collected hairs (excluding hairs attached by static electricity, etc.). The above cleaning operation was repeated 10 times, and the collection rate was calculated from the number of collected hairs to be sprayed, and evaluated according to the following evaluation criteria. Evaluation criteria ；: no problem in collection. (100-80%) Δ; (79 to 50%) ×; hardly collected. (49% -0%)

3. Fiber detachability The following friction test was performed, and the evaluation was performed according to the following evaluation criteria according to the amount of the detached fiber and the surface state of the cleaning sheet after the test. Approx. 300 mm (sample MD) x 20
A sample of a cleaning sheet having a size of 0 mm was attached to a quick wiper (made by Kao, a cleaning tool for flooring), and the flooring (woody tile MT6) of about 6 tatami mats was attached.
13T) is wiped almost once with a stroke of about 900 mm in a direction perpendicular to the groove. Evaluation criteria ；: Almost no fibers fall off the flooring. or,
There are no large pills over 10 mm in diameter on the sample surface. (Suitable as a cleaning sheet.) Δ: Some fibers fall off the flooring. or,
Some large pills exceeding 10 mm in diameter are observed on the sample surface. (Can be used as a cleaning sheet.) ×: Many fibers fall off the flooring. or,
Many large pills exceeding 10 mm in diameter are observed on the sample surface. In addition, the sample surface may be rough and the layer itself may be destroyed. (Cannot be used as a cleaning sheet.)

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

The cleaning sheet of the present invention is excellent in surface strength, does not cause fibers to fall off during cleaning, and is excellent in collecting dust such as hair. More specifically, the cleaning sheet of the present invention comprises the heat-fusible fibers containing the non-heat-fusible fibers, and since the intersections of the non-heat-fusible fibers are not fused, the degree of freedom of the fiber is increased. It has a high structure. Due to the high degree of fiber freedom, it is possible to entangle large dusts such as hair, cotton dust and bread crumbs. In addition, in the conventional cleaning sheet, the number of fusion points between fibers is excessively reduced in order to increase the degree of freedom of the fibers, and the strength of the sheet itself is insufficient. However, the cleaning sheet of the present invention has sufficient strength to withstand use. Therefore, the cleaning sheet of the present invention is a cleaning sheet having excellent cleaning performance and high durability. Further, since the surface is macroscopically smooth, the cleaning sheet collects small dust such as poorly water-soluble and dust. It is also possible.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a preferred apparatus for manufacturing a cleaning sheet of the present invention.

FIGS. 2A and 2B are schematic diagrams of a convex member used for measuring a shear peeling force. FIG. 2A is an enlarged perspective view showing details, and FIG. 2B is a key-like portion (arrow). (b direction) is an enlarged side view, and (c) is an enlarged side view (in the direction of arrow c) showing a space between the key portions.

FIG. 3 is an exploded perspective view of a concave material set used for measuring a shearing peeling force.

FIG. 4 is an exploded perspective view of a set of convex members used for measuring a shear peeling force.

FIG. 5 is a schematic view showing a method for measuring a shear peel force.

[Explanation of symbols]

 1 Cleaning sheet 2 Non-woven fabric

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Shizuno 2606 Kabane-cho Akabane, Haga-gun, Tochigi Prefecture Inside Kao Co., Ltd. F term (reference) 3B074 AA00 AA08 AB01 4L047 AA14 AA21 AA27 BA09 BB02 CA18 CB01 CB10 CC16

Claims (4)

[Claims] 1. A fiber comprising at least a layer forming a cleaning surface, which is a mixture of a heat-fusible fiber and a non-heat-fusible fiber that does not fuse at a temperature in a range of a fusion temperature range of the heat-fusible fiber. The web is made of a non-woven fabric formed by heat-sealing the heat-fusible fiber in the temperature range of the heat-fusible fiber. 0.15 to 0.9 in value
A cleaning sheet of 5 N / (13 mm × 30 mm). 2. The weight ratio of the heat fusible fiber to the non-heat fusible fiber is as follows: heat fusible fiber / non-heat fusible fiber = 55 /
The cleaning sheet according to claim 1, wherein the ratio is from 45 to 95/5. 3. The non-woven fabric according to claim 1, wherein the non-woven fabric made of only the non-heat-fusible fibers used in the non-woven fabric has a sealing temperature of 160 ° C.
1.5 N bonding strength when bonded in 5 seconds sealing time
The cleaning sheet according to claim 1, wherein the cleaning sheet has a thickness of / 30 mm or less. 4. The cleaning sheet according to claim 1, wherein in the nonwoven fabric, the intersections formed by the heat-fusible fibers are fused, and the fused intersections are present throughout.