JP2003230520A - Nonwoven fabric for wiper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric for a wiper that has good aesthetic properties and durability against washing and excels in removing a variety of soils from oil slicks to greasy dirt and can effectively carry out cleaning by even coping with the irregularity of an object to be wiped out. <P>SOLUTION: The nonwoven fabric for a wiper that contains ultrafine fibers has irregularities on the surface and is provided with an adhesive area formed on the whole area of the fabric. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric for wipers, and more specifically, to stains such as an oil film,
The present invention relates to a non-woven fabric for a wiper, which can wipe off stubborn stains that have sticked to it, generate little fluff even after repeated use, and have excellent washing durability and dimensional stability.

[0002]

2. Description of the Related Art Nonwoven fabric wipers using ultrafine fibers are
Various proposals have been made and are currently widely used. For example, Japanese Patent Application Laid-Open No. 3-152255 proposes a wiping material in which a heat-fusible fiber web and an ultrafine fiber web are integrated by hydroentanglement to fuse the heat-fusible fibers.
However, although such wiping material can wipe off small dirt such as dust and dust, it is difficult to wipe out stubborn dirt, and the problem that surface fluff and fiber fall off after washing and the nonwoven fabric becomes harder When the object had irregularities, a sufficient wiping effect was not obtained.

Japanese Patent No. 3112185 discloses a wiper non-woven fabric containing ultrafine fibers and capable of being wiped off and used for a long period of time.
Especially, the stubborn stain removability was not satisfactory.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and its object is to remove stubborn dirt from dirt such as an oil film and to deal with unevenness of an object to be wiped off. Another object of the present invention is to provide a non-woven fabric for wipers, which is capable of exerting a cleaning effect and has excellent feeling, washing durability and dimensional stability.

[0005]

That is, the present invention is a non-woven fabric for wipers containing ultrafine fibers, wherein the non-woven fabric has irregularities on its surface and an adhesive region is formed on the entire surface of the non-woven fabric. A nonwoven fabric for wipers, which is characterized in that

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The nonwoven fabric for wipers of the present invention is characterized in that it contains ultrafine fibers and has an adhesive region on the entire surface of the nonwoven fabric. Due to the existence of such an adhesive area and a non-adhesive area, from fine dirt such as oil film and ink,
Excellent in removing sticky and stubborn stains, less fluffing, washable and reusable.

The single fiber fineness of the ultrafine fibers used in the present invention is
It is preferably 0.5 dtex or less, more preferably 0.0
It is 5 to 0.45 dtex. Examples of such ultrafine fibers include direct spinning fibers and splittable conjugate fibers. In the present invention, splittable conjugate fibers are preferably used. Above all, it is more preferable to use an ultrafine fiber obtained by dividing a splittable conjugate fiber having a substantially circular cross-sectional shape, because the cross-sectional shape has a sharp corner, so that dirt such as an oil film can be easily wiped off. Ultrafine fibers can be obtained by splitting such splittable conjugate fibers mechanically by water flow, needle punching, or by chemical action such as dissolution removal, swelling and shrinkage.

In the present invention, as the splittable conjugate fiber, a conjugate fiber composed of two or more kinds of resins can be used. Examples of such resin include polyester-based polymers, polyolefin-based polymers, polyamide-based polymers, polystyrene-based polymers, polyacrylonitrile-based polymers, polyvinyl alcohol-based polymers, ethylene-vinyl alcohol-based copolymers, polylactic acid-based polymers. Examples thereof include polymers, and each component may be one type or two or more types of polymers, but is not limited thereto.

As the polyester, terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenoxy) ethane,
Aromatic dicarboxylic acids such as 4,4-dicarboxydiphenyl and 5-sodium sulfoisophthalic acid; Aliphatic dicarboxylic acids such as azelaic acid, adipic acid and sebacic acid or esters thereof; ethylene glycol, diethylene glycol, 1,3- Propanediol, 1,4-
Examples of the fiber-forming polyester include diols such as butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol, and polytetramethylene glycol. It is preferable that mol% or more is an ethylene terephthalate unit.

As the polyamide, an aliphatic polyamide containing nylon 6, nylon 66 and nylon 12 as a main component,
A semi-aromatic polyamide can be mentioned, and a polyamide containing a small amount of a third component may be used.

The composite form of these resin components is not particularly limited. For example, as the arrangement of two types of resin components, chrysanthemum-shaped fibers and components having a cross-sectional shape in which one component is radially arranged between other components are used. A bimetal type having a cross-sectional shape in which layers are alternately laminated, a sea-island fiber having a cross-sectional shape in which one component is dispersed in another component in an island shape, and the like can be given. Among these splittable conjugate fibers, ultrafine fibers obtained from chrysanthemum-type fibers and bimetal-type fibers have a sharp cross-sectional shape portion, are more easily scraped off dirt, and are easily used for oily dirt.

Further, in the present invention, heat fusible fibers may be used. By using the heat-fusible fiber, it is possible to improve the shape stability of the nonwoven fabric for wiper. At this time, the mixing ratio of the ultrafine fibers is preferably 50% or more. If the mixing ratio is less than 50%, the wiping performance may deteriorate. Especially when used for removing dirt such as oil film, the mixing ratio of split fibers is preferably 80% or more. At this time, as the heat-fusible fiber, a heat-fusible fiber composed of a single component may be used.
It is more preferable to use a composite type heat fusible fiber such as a side-by-side type or a core-sheath type, which is composed of more than one kind of resin component, because the fiber strength is maintained by the non-fused portion. The melting point of the fusion component preferably has a melting point temperature difference of 10 ° C. or more in order to prevent the ultrafine fibers from being fused.

As a component of the heat-fusible fiber, 6 nylon / polyethylene, polypropylene / polyethylene, polypropylene / ethylene-vinyl acetate copolymer, polyester / polypropylene, polyester / polyethylene, 6 nylon / 66 nylon, high density polyester /
A combination of low density polyester and the like can be exemplified, but the invention is not limited thereto.

As the non-woven fabric for wipers of the present invention, only the above-mentioned non-woven fabric made of ultrafine fibers may be used, or a non-woven fabric used in combination with other fibers may be used. Other fibers include
There is no particular limitation, and various synthetic fibers and natural fibers can be used.

The method for producing the nonwoven fabric for wipers of the present invention is not particularly limited, and examples thereof include a dry method such as a card method, an air lay method, a spun bond method, and a wet method. Above all, in the present invention, it is preferable to form the fibrous web by a card method, an air lay method or the like. As the fibrous web, it is preferable to use a parallel web, a semi-random web, a cross web, or the like, and a parallel web having particularly high productivity is preferable.

In particular, the nonwoven fabric for wiper of the present invention is preferably formed by mixing various fibers such as the above-mentioned ultrafine fibers and heat-fusible fibers, and then forming a fiber web by a card method or an air-lay method.

When the ultrafine fibers are obtained by mechanically splitting from the splittable conjugate fiber, the splittable conjugate fiber may be split before forming the fiber web, but after the fiber webs are laminated, needle punching is performed. Alternatively, it is preferable to perform mechanical action such as hydroentanglement to divide and entangle the splittable conjugate fibers because the fibers can be more firmly bonded.

The nonwoven fabric for wipers of the present invention is characterized in that it has irregularities on the surface, and by having irregularities, excellent wiping performance is achieved. That is, the convex portion on the surface of the non-woven fabric has a synergistic effect with the bonding area described later, and the wiping performance is further exhibited. In addition, by having unevenness on the surface of the nonwoven fabric, it is possible to exhibit excellent wiping properties even when the object has unevenness, and at the same time, it becomes easier for ultrafine fibers to appear on the surface of the nonwoven fabric, making it easier to scrape fine dirt such as oil films. It is considered to be. As a method for imparting irregularities to the surface of the non-woven fabric, a mesh-like resin net, a wire net, etc. are used as a support and a fiber web is placed on the support, and the web surface is hydroentangled to form a knuckle of warp and weft of a mesh belt. The method of using a water flow such as that obtained by transferring the height difference of the non-woven web to the nonwoven web, a method of using an embossing roll, and the like can be mentioned, but in the present invention, a softer nonwoven fabric is obtained, and unevenness easily remains after washing. Application by hydroentanglement is preferred.

The shape of the irregularities formed on the nonwoven fabric for wipers of the present invention may be, for example, a herringbone shape, a parallel oblique line shape, a lattice shape, a square shape, etc., as shown in FIG. The concave portions or the convex portions may be continuous or may be scattered in a mountain valley shape, but a continuous shape is preferable in terms of wiping property. In addition, the distance between the nearest parallel concave portions and the convex portions or the distance between the concave portions and the convex portions that are scattered is preferably 0.5 to 6 mm, and more preferably 0.5. ~ 3.5 mm. In particular, a cedar twill shape is preferably such that the twill direction is symmetrical with a cycle of 10 to 35 mm, and the unevenness between twill patterns is preferably in the range of 0.5 to 6 mm.

Further, in the present invention, it is preferable that the height difference between the convex portion and the concave portion is 20% or more with respect to the thickness of the nonwoven fabric. If the height difference is 20% or more, the surface area of the non-woven fabric increases, so that the distance that the non-woven fabric comes into contact with dirt becomes long and the wiping becomes easy. In addition, stains are physically caught on the protrusions, and at the same time, they easily adhere to the protrusions, which is effective in wiping. Further, depending on the dirt, the dirt is retained in the concave portion, and recontamination can be prevented. If the height difference is less than 20%, the surface of the non-woven fabric becomes flat, so that it may be less likely to be caught by stains and may not exhibit sufficient wiping performance, or stains once wiped may be redeposited. The height difference referred to in the present invention can be determined by the method described below.

Further, the nonwoven fabric for wipers of the present invention is characterized in that an adhesive region is formed on the entire surface. The adhesive area formed on the entire surface of the non-woven fabric can wipe off the stubborn stains that have stuck to the nonwoven fabric, and thus exhibits excellent wiping performance against various stains. Since fibers are partially fixed in the adhesive region and the adhesive region is harder than the non-adhesive region, stubborn dirt can be easily scraped off and shape stability is maintained even when washed. Furthermore, workability is improved by having the adhesive region. That is, since the non-woven fabric has a fixed and hardened adhesive portion, the non-woven fabric has a firm feeling, and it has a good hand-held feeling and is easy to work at the time of wiping.

The adhesive region referred to in the present invention can be formed by using a resin binder or the like.
Emulsion resin binders can be used. Examples of the binder resin include, but are not limited to, acrylic resins, acrylic ester copolymer resins, polyurethane resins, vinyl acetate copolymer resins, epoxy resins, and styrene-acrylic copolymer resins.

The method for forming the adhesive region is not particularly limited as long as the adhesive region is formed on the entire surface of the nonwoven fabric, and a dipping method, a spray method or the like can be used. Among them, in the present invention, the dipping method is preferable because it is possible to impregnate the inside of the non-woven fabric with the binder resin and form the adhesive region uniformly near the surface of the fiber material.

When the binder resin is applied to the nonwoven fabric, it is preferably 5 to 15%, more preferably 8 to 12%, based on the weight of the nonwoven fabric. If the coating amount is less than 5%, the resin may not be uniformly coated on the entire fiber and may be partially weakened. Therefore, sufficient morphological stability cannot be obtained, fluffing is likely to occur, and it may not be possible to withstand repeated washing. On the other hand, if the coating amount exceeds 15%, more resin than necessary adheres to the fibers and forms a film, so the effective edge of the ultrafine fibers for wiping is completely covered and the wiping effect is achieved. May not be exhibited. Further, the non-woven fabric becomes stiff and uncomfortable to hold, and at the same time, it may not be possible to flexibly deal with the fine irregularities of the object to be wiped, and the wiping effect may be reduced.

The binder resin that has penetrated in the thickness direction of the non-woven fabric for wipers may be unevenly distributed on both sides of the non-woven fabric depending on the drying conditions after coating, or may exist uniformly in the thickness direction. Surface fluff and washing durability can be sufficiently obtained even when the binder resin is unevenly distributed on both sides of the nonwoven fabric or even when the binder resin is uniformly present in the thickness direction. In particular, in the present invention, the binder resin also exists inside the nonwoven fabric. Is preferable from the viewpoint of preventing the occurrence of surface fluff and washing durability.

Further, in the present invention, the surface of the non-woven fabric is fluffed,
In order to prevent the fibers from falling off, it is preferable that the fibers are divided and entangled by hydroentangling or the like, and then a binder resin or the like is applied to the non-woven fabric to form an adhesive region. Due to this, there is more space between the superfine fibers that have been divided and entangled, due to the binder resin,
It is firmly fixed.

As described above, the non-woven fabric for wipers of the present invention prevents the fluff of the non-woven fabric from being fluffed by the adhesive region existing on the entire surface of the non-woven fabric, and the entanglement points of the fibers do not shift even after washing and the non-woven fabric shape does not collapse. , Can be used again. Further, the use of ultrafine fibers having an edge in the non-woven fabric has an advantage that very fine dirt can be wiped off and the removed fine dirt can be easily taken into the non-woven cloth.

The nonwoven fabric for wipers of the present invention can be used for various wipers, and can be used for wiping off stains such as glass, electric appliances, furniture, and gas stoves. In addition, the wiper obtained by the present invention has excellent washing durability and therefore can be repeatedly used, which is advantageous in terms of cost.

[0029]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Each physical property value in this example was measured by the following methods.

Non-woven fabric thickness The measurement was performed using a CCD laser displacement sensor LK-2000 (manufactured by Keyence Corporation).

Measurement was performed using a height difference CCD laser displacement sensor LK-2000 (manufactured by Keyence Corporation) of unevenness of the nonwoven fabric. The measurement was carried out under no load, and the high peak portion thickness 6 points and the low peak portion thickness 6 points were averaged, and the difference in both average values was divided by the nonwoven fabric thickness to obtain the height difference.

Example 1 Splittable conjugate fiber having a cross-sectional shape in which nylon 6 and polyethylene terephthalate were laminated alternately (WRAMP manufactured by Kuraray Co., Ltd., fineness 3.8 dtex, fiber length 51 mm) 1
00% was supplied to the card machine to obtain a fiber web. The obtained web was divided into ultrafine pieces by hydroentanglement, and at the same time, fibers were entangled. Then, a water flow was applied from the non-woven fabric side on the net on which the concavo-convex could be imparted to impart the irregularity as shown in FIG. 1 (a) to the non-woven fabric. Then, an acrylic resin (FX-32 manufactured by Nippon Carbide Co., Ltd.) was prepared by a dip-nip method.
2) was applied, and 8% of the resin based on the mass of the non-woven fabric was uniformly attached to the whole non-woven fabric to obtain a non-woven fabric for wipers having a basis weight of 80 g / m ² . When the obtained non-woven fabric was observed in detail,
It was confirmed that the binder resin was also present inside the nonwoven fabric. The results are shown in Table 1.

Example 2 Split-type composite fiber having a cross-sectional shape in which nylon 6 and polyethylene terephthalate were alternately laminated in layers (WRAMP manufactured by Kuraray Co., Ltd., fineness 3.8 dtex, fiber length 51 mm).
85%, 15% of core-sheath type composite binder fibers (polypropylene as core component and polyethylene as sheath component) (NBF (H), 2.2 dtex, 51 mm manufactured by Daiwabo Co., Ltd.) were mixed and fed to the card machine, and then the fiber web. Was hydro-entangled to be divided into ultrafine pieces, and at the same time, fibers were entangled to obtain a nonwoven fabric. Then, a water flow was applied from the non-woven fabric side on the net on which the non-woven fabric could be provided to give the non-woven fabric the irregularities as shown in FIG. 1 (a). Thereafter, 5% of an acrylic resin (FX-322 manufactured by Nippon Carbide Co., Ltd.) was applied to the mass of the non-woven fabric by the dip-nip method, and the resin liquid was dried by a heating cylinder and the sheath component of the heat-sealing fiber was fused, A nonwoven fabric for wipers having a basis weight of 80 g / m ² was obtained. When the obtained nonwoven fabric was observed in detail, it was confirmed that the acrylic resin was present inside the nonwoven fabric. (Table 1)

Comparative Example 1 A nonwoven fabric for wipers having a basis weight of 80 g / m ² was obtained without subjecting the fibrous web obtained in Example 1 to surface unevenness and acrylic resin coating. (Table 1)

Comparative Example 2 An acrylic resin was applied to the surface of the nonwoven fabric by the printing method as shown in FIG.
Example 1 except that the coating as shown in FIG.
A nonwoven fabric for wipers having a basis weight of 80 g / m ² was obtained in the same manner as in. The obtained nonwoven fabric for wipers was 5 with respect to the weight of the nonwoven fabric.
% Of the resin was partially attached. (Table 1)

[0036]

[Table 1]

Using the nonwoven fabrics for wipers obtained in the above-mentioned Examples and Comparative Examples, wipers were prepared and evaluated as follows. The results are shown in Table 2.

・ Evaluation of fluff removal property Drop 0.1 g of water on the mirror surface with a dropper, fold a 15 cm square wiper in four and hold it by hand.
The fluff after being wiped 0 times was observed. The evaluation was performed in five stages. 5: No shedding of fluff 4: 1 to 5 pieces 3: 6 to 25 pieces 2:26 to 50 pieces 1:51 or more

A 20 cm square is marked on the washing durability evaluation sample, and JIS L1
Washing was carried out 5 times according to the washing evaluation method of 096, and the change in shrinkage of the sample after washing was measured. The evaluation was made on the basis of the change in shrinkage ratio in the lateral (CD) direction according to the following four stages. ◎: Less than ± 1% ○: ± 1% or more and less than 3% △: ± 3% or more and less than 5% ×: ± 5% or more

Evaluation of Oil Film Wipeability A circular plate of oil-based ink was pressed on a glass plate. 15 cm
The sample of the image was folded in four and held by hand, and the glass plate was wiped until the stain was completely removed, and the number of times of wiping until the stain was completely removed was measured.

Evaluation of stubborn dirt wiping-off property "Moriwiper" by measuring the absorbance (A) of a glass plate
(Sumitomo Lubricant Co., Ltd.) was applied in a circular shape and dried. After drying, the absorbance (B) was measured and attached to the base of a friction fastness measuring device. A sample whose moisture content was adjusted to 100% was attached to a friction element and reciprocated once, and the absorbance (C) after the removal was measured. The removal rate of dirt was measured by the calculation formula shown below. Removal rate = (C−B) / (A−B) × 100

-Hand feeling evaluation The hand-held feeling at the time of wiping was evaluated by three levels. ○: Soft texture △: Slightly hard texture ×: Hard texture

[0043]

[Table 2]

[0044]

According to the present invention, an excellent wiping effect can be achieved under any cleaning condition from dirt such as oil film to stubborn dirt. Further, there is provided a wiper made of a non-woven fabric which has less fluffing and excellent washing durability.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a handle of a nonwoven fabric that can be used in the present invention.

FIG. 2 is a plan view showing a handle of a non-woven fabric used in a comparative example of the present invention.

[Explanation of symbols]

A: recess B: convex C: Bonded area D: Non-bonded area

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3B074 AA02 AA08 AB01                 4L047 AA21 AA23 AA27 AB08 BA04                       BA15 BC07 CC16

Claims (3)

[Claims] 1. A non-woven fabric for wipers, which comprises ultra fine fibers, wherein the non-woven fabric has irregularities on the surface thereof and an adhesive region is formed on the entire surface of the non-woven fabric. 2. The nonwoven fabric for wipers according to claim 1, wherein the adhesive region is formed of a resin binder, and the resin binder is present inside the nonwoven fabric. 3. A wiper using the nonwoven fabric for wiper according to claim 1.