JPH1072757A - Nonwoven fabric for cleaning material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject nonwoven fabric consisting of a spunbonded nonwoven fabric, having each specific thermofused portions and napped portions, thus bearing adsorptivity and holding ability for minute dust such as soil dust, also excellent in trapping performance for relatively large-sized dust such as bread crumb and the hair. SOLUTION: This nonwoven fabric, which consists of a spunbonded nonwoven fabric, has thermofused portions 12a-12c as a result of mutual fusing of the constituent fibers 11a-11c and napped portions as fiber ends 13a-13d as a result of tensile breakage of the constituent fibers, and has the following characteristics: basis weight stands at 20-100g/m<2> , bulk density stands at 0.03-0.13g/cm<3> , and the fineness of the constituent fiber stands at 1-15 denier. It is preferable that there exist the napped portions at 10-100/cm on the surface, the area of each of the thermofused portions 12a-12c stands at <=2mm2 , the distance between the centers of the thermofused portions 12a-12c adjacent to one another stands at 1-5mm, and the total area of the thermofused portions 12a-12c accounts for 5-30% of the surface area of this nonwoven fabric. Besides, it is preferable that a partially fused nonwoven fabric is raised by needle punching at a needle depth of at least 1st varve and >=5mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric for a wiping material and a method for producing the same, and more particularly to a nonwoven fabric for a wiping material suitable for use as a cleaning sheet for business use or home use, various wiping materials, and the like. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, many materials based on nonwoven fabrics have been provided for cleaning articles. For example, a cleaning material made of a nonwoven fabric is used. The wiping material is required to have a dust collecting property for absorbing and removing dust on the surface to be cleaned, a dust retaining property for holding the collected dust, and a property for preventing the surface to be cleaned from being damaged. For this reason, the wiping material is required to have a relatively small fiber diameter and a small gap between fibers in order to wipe out small dust. On the other hand, the degree of freedom of the fiber to entangle and hold large dust is required. However, a material having practical strength is required.

In recent years, it has been proposed to use a soft and bulky nonwoven fabric as a wiping material in order to improve the performance such as the dust collecting property, the dust retaining property and the scratch preventing property of the cleaning surface. For example, a nonwoven fabric having naps formed by cutting fiber filaments (Japanese Patent Laid-Open No. 2-124122), a nonwoven fabric aggregate entangled on one or both sides of a mesh sheet (Japanese Patent Laid-Open No. 5-124122). No. 192285) has been proposed.

[0004]

However, in the case of brushing by post-processing of a general non-woven fabric such as a non-woven fabric having raised hair, a special facility for raising the brush is required, so that the production cost is increased and the strength is reduced. A large amount of non-woven fabric must be used in order to increase the bulk while maintaining it, and since the fibers are densely arranged and the fibers in the inner layer do not contact the surface to be cleaned, the use of non-woven fabric as a base material is There are problems such as low efficiency. On the other hand, in the case where the fiber aggregate is entangled with the mesh sheet, there is a problem that the production cost is increased because a compounding step of the mesh sheet and the fiber assembly and a heat treatment step are required.

Further, in the used cleaning material, since various kinds of adsorbed dust are entangled between the fibers, it is not practical to remove the dust by washing or the like and reuse it many times. Therefore, since it is disposable, it must be able to be manufactured at low cost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide not only excellent performance of adsorbing and holding small dust such as dust, but also excellent performance of collecting large dust such as bread dust, hair and cotton dust, and manufacturing at low cost. It is an object of the present invention to provide a nonwoven fabric for a wiping material and a method for producing the same.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention relates to a heat-bonded portion made of a spun-bonded non-woven fabric, wherein constituent fibers of the non-woven fabric are heat-bonded to each other;
An object of the present invention is to provide a nonwoven fabric for a wiping material having a portion other than the heat-sealed portion and a fluff portion formed of an end of a fiber cut in tension.

Hereinafter, the nonwoven fabric for wiping material of the present invention (hereinafter referred to as “nonwoven fabric”)
The “nonwoven fabric of the present invention” will be described in detail.

[0009] The nonwoven fabric of the present invention is based on a spunbonded nonwoven fabric. In the present invention, examples of the thermoplastic resin as the material of the spunbonded nonwoven fabric include synthetic resins such as polyolefins such as polypropylene and polyethylene, polyesters, and polyamides. The constituent fibers of the spunbonded nonwoven fabric are one of these thermoplastic resins.
It consists of a species or a combination of two or more species. Among these, polypropylene is preferred because it is a relatively inexpensive material and is easily fiberized.

The fibers constituting the nonwoven fabric of the present invention have good fineness because they can be easily raised at a high density, have good bulkiness, and can provide a nonwoven fabric having a required tensile strength. Is preferably in the range of 1 to 15d, and more preferably in the range of 1.5 to 10d.

The cross-sectional shape of the fiber is circular, elliptical,
Any shape such as a rhombus and a triangle may be used, and there is no particular limitation. Further, the fiber may have a single structure composed of one or more resin components, or may have a core-sheath or side-by-side composite fiber composed of two or more resin components. Further, the fiber cross section may have a structure such as a split-type fiber having a form in which a plurality of wedge-shaped portions made of two or more resin components are radially arranged.

The nonwoven fabric of the present invention has a good dust-collecting property as a wiping material and has a required tensile strength.
It is preferably in the range of 0 to 100 / cm, and more preferably in the range of 15 to 70 / cm. In the present invention, tensile cutting refers to cutting while applying tensile tension to the fiber, and the end of the tensile-cut fiber is stretched, and the cut portion is in a state in which the fiber is cut off. It is considered to be effective for the performance of absorbing and retaining dust. The method of manufacturing a tensile cut nonwoven fabric is as follows:
From the viewpoint of productivity, a method of forming the nonwoven fabric and then tensile-cutting the constituent fibers is preferable. In particular, a method of pulling and cutting the constituent fibers of the nonwoven fabric by needle punching is preferable because it can be performed using a general-purpose processing machine.

Further, the nonwoven fabric of the present invention has a plurality of heat-sealed portions in which continuous continuous fibers constituting the spunbonded nonwoven fabric are partially heat-sealed, and the heat-sealed portions are uniformly distributed. A large number of irregularities are formed on the surface. further,
In the present invention, have good fuzz resistance in that the nonwoven fabric having the required tensile strength is obtained, it is preferable area of each heat fused portion is 2 mm ² or less, more preferably be 1 mm ² or less The distance between the centers of the adjacent heat-sealed portions is preferably 1 to 5 mm, more preferably 1 to 3 mm. The ratio of the heat-sealed portion to the surface area of the nonwoven fabric is preferably in the range of 5 to 30%, more preferably in the range of 7 to 20%. The shape of the heat-sealed portion is not particularly limited, and may be, for example, any shape such as a circle, a diamond, and a triangle.

In the nonwoven fabric of the present invention, for example, as shown in FIG. 1, the heat fusion portion is formed by forming continuous filaments 11a, 11b, 11c on the surface of the nonwoven fabric at predetermined intervals. It has a form which is focused and heat-sealed at the parts 12a, 12b, 12c. Heat fusion part 12
Between a and 12b, and between 12b and 12c, ends 13a, 13b, 13c, 13d, etc. of the continuous filaments protrude from the surface to form fluff. As described above, in the nonwoven fabric of the present invention, the heat-sealed portion has a large number of fluffs on the surface, the surface of the nonwoven fabric becomes uneven by the heat-sealed portion, and the fibers are arranged in a loop or radially protruding arrangement. As a result, the degree of freedom of the fibers is increased, so that small dusts can be entangled with large dusts such as bread crumbs, hair, and cotton scraps, so that a wide range of dusts can be reliably collected.

The nonwoven fabric of the present invention preferably has a basis weight of 20 to 100 g / m ² , more preferably 30 to 80 g, in that the nonwoven fabric has a good dust-collecting property and a required tensile strength. / M ² .
The bulk density, maintaining bulkiness, also in terms of retaining a required tensile strength is preferably in the range of 0.03~0.13g / m ^2, more preferably 0.05~0.10g / m ²
Range.

In the production of the nonwoven fabric of the present invention, a continuous nonwoven fabric web consisting essentially of continuous filaments formed by a spunbonding method is used, the continuous filaments are partially thermally bonded, and further raised by needle punching. It can be performed according to a method having a step. There is no particular limitation on the method of partially thermally joining the continuous continuous fibers, and a conventional method such as heating with a hot roll or ultrasonic fusion may be used.

Felt needles used in the needle punching process have needle counts of 32 to 42 in consideration of the balance between fluffing and needle breakage.
Are preferred. The cross-sectional shape of the felt needle is
The shape may be a circle, a triangle, a square, or the like.

Further, the number of punches for the needle punching is preferably in the range of 30 to 150 / cm ² from the viewpoints of fluffiness, tensile strength of the nonwoven fabric, and working speed. The depth of the needle is preferably not less than the first barb and not less than 5 mm, and more preferably from 10 to 25 mm from the viewpoint of the working speed, in that the nonwoven fabric has a fuzziness and retains a required tensile strength. It is.

The nonwoven fabric of the present invention can be suitably used for business or household cleaning sheets, various wiping materials, and the like.

[0020]

EXAMPLES Hereinafter, Examples and Comparative Examples of the present invention will be described.
The present invention will be described more specifically. In the following Examples and Comparative Examples, evaluation or measurement of the basis weight, thickness, tensile strength, fluffing and dust collection were performed according to the following methods.

The basis weight was determined in accordance with the method described in 4.2 of JIS L1906.

The thickness was measured under a load of 2 kPa according to the method described in 4.1 of JIS L1906.

Tensile strength Measured according to the method described in JIS L1906, 4.3.1.

Fuzzing A test piece cut into a square of 5 cm × 5 cm was folded in two in the side direction of the square, the broken line portion was magnified 10 times with a microscope and photographed, and the number of fluffing was counted. At this time, counting was carried out only for the fibers having a height of 0.5 mm or more outside the broken line, and two points on each of the front and back sides were measured to obtain an average value.

Polyester film with dimensions of 240 mm x 240 mm
(Thickness: 30-50 μm) on the surface as test dust
1.5 g of IS8 dust was uniformly spread on the surface. Next
Attach the handle to a 5cm x 20cm x 3mm iron plate
5cm × 20 on the bottom of a jig (total weight 320g)
A nonwoven fabric test piece cut into a size of cm was fixed. JI
Cure on polyester film sprayed with S8 type dust
Place the tool and place the nonwoven fabric test piece on the surface of the polyester film.
Abutting one end of the film in the longitudinal direction of the jig.
From the jig to the other end in about 6 seconds
Therefore, the weight of the collected dust was measured. Non-woven this value
Cross section of cloth test piece (0.01m ^Two)
The amount of dust collected per unit area was determined. Also, as test dust
Then, the same test was conducted using 4.5 g of commercially available bread crumbs,
The amount of dust per unit area of the nonwoven fabric test piece was determined.

Example 1 A basis weight of 40 denier made of polypropylene fiber having a fineness of 3 deniers by a spun bond method.
g / m ² of nonwoven web was produced. Next, the nonwoven fabric web is subjected to a linear pressure of 55 ° C. by an embossing roll at 160 ° C.
Embossing treatment was performed at kg / cm to produce a nonwoven fabric having a total area ratio of the heat-sealed portion of 10.2% and a thickness of 0.3 mm. The embossing roll used had 0.48 individual dots.
A square of mm square having a dot center distance of 1.5 mm was used. Next, a felt needle having a needle count of 36 having a square cross-section of the needle was used for the nonwoven fabric, and the number of punches was 7
Needle punching was performed at 0 needles / cm ² and a needle depth of 16 mm to produce a nonwoven fabric for a wiping material. About the obtained nonwoven fabric for wiping materials, evaluation or measurement of the basis weight, thickness, tensile strength, fluffing and dust collection amount were performed. Table 1 shows the results.

Example 2 A nonwoven fabric made of the polypropylene fiber obtained in Example 1 and having a basis weight of 40 g / m ² was embossed in the same manner as in Example 1 to produce a nonwoven fabric. For this nonwoven fabric, a felt needle having a needle count of 36 having a triangular cross section was used, and the number of punches was 100 /
Needle punching was performed at a cm ² and a needle depth of 14 mm to produce a nonwoven fabric for a wiping material. About the obtained nonwoven fabric for wiping materials, evaluation or measurement of the basis weight, thickness, tensile strength, fluffing and dust collection amount were performed. Table 1 shows the results.

Example 3 A nonwoven fabric web having a basis weight of 40 g / m ^{2 made} of 3d polypropylene fiber was produced in the same manner as in Example 1, and then heated at 150 ° C. with an embossing roll at a linear pressure of 27.5 kg / cm. Bonding was performed to produce a nonwoven fabric having a total area ratio of 10.2% and a thickness of 0.3 mm of the heat-sealed portion. The same embossing roll as that used in Example 1 was used. Next, this nonwoven fabric was subjected to needle punching at the number of punches of 50 pieces / cm ² and the needle depth of 16 mm using the same felt needle as that used in Example 1 to produce a nonwoven fabric for a wiping material. did. About the obtained nonwoven fabric for wiping materials, evaluation or measurement of the basis weight, thickness, tensile strength, fluffing and dust collection amount were performed. Table 1 shows the results.

(Example 4) A basis weight of 40 made of a polypropylene fiber having a fineness of 3 deniers by a spun bond method.
g / m ² of nonwoven web was produced. Next, the nonwoven fabric web is subjected to a linear pressure of 60 by an embossing roll at 165 ° C.
Embossing treatment was performed at kg / cm to produce a nonwoven fabric having a total area ratio of the heat-sealed portion of 10.2% and a thickness of 0.4 mm. The same embossing roll as in Example 1 was used.
Next, needle punching was performed in the same manner as in Example 2 to produce a nonwoven fabric for a wiping material. About the obtained nonwoven fabric for wiping materials, evaluation or measurement of the basis weight, thickness, tensile strength, fluffing and dust collection amount were performed. Table 1 shows the results.

Example 5 The basis weight was 30 g / m ² ,
A nonwoven fabric having a thickness of 0.3 mm was produced in the same manner as in Example 4, except that the embossing roll temperature was 150 ° C and the linear pressure was 55 kg / cm. Next, needle punching was performed in the same manner as in Example 2 to produce a nonwoven fabric for a wiping material. About the obtained nonwoven fabric for wiping material, the basis weight, thickness, tensile strength,
The fluff and the amount of dust collection were evaluated or measured. Table 1 shows the results.

(Comparative Example 1) The nonwoven fabric web obtained in Example 1 was evaluated or measured for the basis weight, thickness, tensile strength, fluffing and dust collection without needle punching. Was. Table 1 shows the results.

Comparative Example 2 Needle punching was performed in the same manner as in Example 1 except that the number of punches for needle punching was changed to 150 / cm ² to obtain a nonwoven fabric for a wiping material. Evaluation or measurement of thickness, tensile strength, fluffing and dust collection were performed. Table 1 shows the results.

[0033]

[Table 1]

[0034]

The nonwoven fabric for wiping materials of the present invention is excellent not only in the performance of adsorbing and retaining small dust such as dust, but also in the performance of collecting large dust such as bread dust, hair, cotton dust, etc. And it can be manufactured at low cost.

Further, according to the manufacturing method of the present invention, the nonwoven fabric for a wiping material can be easily manufactured at a low cost at a simple process.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating the structure of a heat-sealed portion of a nonwoven fabric for a wiping material of the present invention.

[Explanation of symbols]

11a, 11b, 11c Continuous continuous fiber 12a, 12b, 12c Heat-fused portion 13a, 13b, 13c, 13d End of continuous continuous fiber cut by tension

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[Procedure amendment]

[Submission date] October 27, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

In the nonwoven fabric of the present invention, for example, as shown in FIG. 1, the heat fusion portion is formed by forming continuous filaments 11a, 11b, 11c on the surface of the nonwoven fabric at predetermined intervals. It has a form which is focused and heat-sealed at the parts 12a, 12b, 12c. Heat fusion part 12
Between a and 12b, and between 12b and 12c, ends 13a, 13b, 13c, 13d, etc. of the continuous filaments protrude from the surface to form fluff. Thus, in the nonwoven fabric of the present invention, heat sealing section is provided with a large number of fuzz on the surface, Ri is Do the uneven <br/> nonwoven surface by heat-sealing portion, also fiber loop Since the degree of freedom of the fibers is increased due to the protruding arrangement in the shape of a circle or a radius, the dust can be entangled from small dust to large dust such as bread dust, hair and cotton dust, and a wide range of dust can be reliably collected.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The nonwoven fabric of the present invention preferably has a basis weight of 20 to 100 g / m ² , more preferably 30 to 80 g, in that the nonwoven fabric has a good dust-collecting property and a required tensile strength. / M ² .
The bulk density, maintaining bulkiness, also in terms of retaining a required tensile strength is preferably in the range of 0.03~0.13g / cm ^3, more preferably 0.05~0.10g / c
m ³ .

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mikio Nakagawa 1-2-1, Waki, Waki-cho, Kuga-gun, Yamaguchi Prefecture Inside Mitsui Petrochemical Industry Co., Ltd.

Claims (5)

[Claims] 1. A heat-sealed portion made of a spun-bonded non-woven fabric, in which constituent fibers of the non-woven fabric are heat-sealed to each other, and an end portion of the fiber which is tensile-cut at a portion other than the heat-sealed portion. A nonwoven fabric for a wiping material having a fluff portion. 2. The nonwoven fabric for a wiping material according to claim 1, wherein a fuzz portion formed of an end portion of the fiber cut by tension is provided in a surface thereof at 10 to 100 pieces / cm. 3. An area of the heat-sealed portion is 2 mm ² or less, and a distance between centers of adjacent heat-sealed portions is 1 to 5 m.
2. The nonwoven fabric for a wiping material according to claim 1, wherein the ratio of the total area of the heat-sealed portion to the surface area of the nonwoven fabric is 5 to 30%. 4. The method according to claim 1, wherein the basis weight is 20 to 100 g / m ² , the bulk density is 0.03 to 0.13 g / cm ³ , and the fineness of the constituent fibers is 1 to 15 d. Non-woven fabric for cleaning materials. 5. A method for producing a nonwoven fabric for a wiping material, comprising the step of raising the partially thermally bonded spunbonded nonwoven fabric by needle punching at a needle depth of at least the first barb and a depth of at least 5 mm. .