JPH08275915A - Wiping material - Google Patents

Abstract

PURPOSE: To provide a wiping material which can wipe out a large quantity of stains by constituting it of nonwoven fabric which has a rough layer mainly composed of thick fiber not less than a specific denier value and a dense layer mainly composed of very thin fiber not more than a specific denier value and has a hole opening part. CONSTITUTION: In a wiping material, after layering a fiber web being a rough layer mainly composed of thick fiber and a fiber web being a dense layer mainly composed of very thin fiber, a hole opening part is formed. The rough layer is much preferable to contain thick fiber 50 to 60wt.% having fineness of 1 to 5 denier, thick fiber 10 to 30wt.% having fineness not less than 5 denier and divided fiber 10 to 40wt.% which is generated from easily divisible fiber and has fineness not more than 0.8 denier. In density, the abundance ratio in the dense layer mainly composed of very thin fiber having fineness not more than 0.8 denier is preferable to be not less than 60wt.%, and is much preferable to be not less than 80wt.%. The hole opening part can be formed by operating a water flow by using a net having a large hole opening part as a support body on which the fiber web is placed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a wiping member.

[0002]

2. Description of the Related Art A wiping material containing ultrafine fibers having a fineness of 0.8 denier or less is suitable because it can wipe off an oil film or the like which cannot be wiped off by a conventional wiping material. For example, the actual Kaihei 4-33686
Japanese Patent Publication discloses a non-woven fabric for cleaning which is entangled and integrated and which has a lipophilic layer composed of polyolefin ultrafine fibers and polyester ultrafine fibers and a hydrophilic layer composed of rayon fibers or cotton fibers. However, although this non-woven fabric for cleaning is suitable for wiping off fine oil stains on eyeglasses, optical equipment, office automation equipment, etc., it is suitable for wiping off a large amount of oil stains such as ink used for printing. Absent.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiping member capable of wiping off a large amount of dirt.

[0004]

The wiping material of the present invention has a rough layer mainly composed of thick fibers of 1 denier or more,
And a dense layer mainly composed of ultrafine fibers of 8 denier or less,
In addition, it is made of a non-woven fabric having openings.

[0005]

The wiping material of the present invention has a dense layer mainly composed of ultrafine fibers having a denier of 0.8 or less, so that it has excellent wiping property and has an opening portion. Since the boundary portion between the open portion and the non-opened portion can be sharply acted on the object to be cleaned, the wiping property is superior, and the wiped dirt can be moved to the rough layer through the open portion and held. It can wipe off a lot of dirt.

The coarse layer of the wiping material of the present invention is mainly composed of thick fibers having a fineness of 1 denier or more, and relatively large voids are formed, so that there is a large space for holding the dirt wiped by the dense layer and a large amount of it. Can hold dirt. In addition, since the coarse layer is mainly composed of fibers thicker than the dense layer, it is bulky and excellent in workability. In particular, when the thick fibers forming the rough layer contain fine fibers having a fineness of 5 denier or more, preferably 5 to 9 denier, these effects are remarkable. This thick fiber having a fineness of 5 denier or more is preferably contained in an amount of 5% by weight or more, more preferably 10 to
Contains 30% by weight or more. Examples of the thick fibers include recycled fibers such as rayon fibers, animal fibers such as silk and wool, semi-synthetic fibers such as acetate fibers, nylon fibers, vinylon fibers, acrylic fibers, polyester fibers, and polychlorinated fibers. Vinylidene fiber, polyvinyl chloride fiber,
Synthetic fibers such as polyurethane fibers, polyethylene fibers, polypropylene fibers, plant fibers such as cotton fibers, and animal fibers such as wool can be used. Among these, hydrophilic fibers such as rayon fibers and cotton fibers are also suitable because they have excellent water retention.

In addition to these thick fibers, if ultrafine fibers having a fineness of 0.8 denier or less are mixed and entangled with each other, the abrasion resistance of the coarse layer is improved. ,
More preferably, 10 wt% or more is mixed. On the other hand, 50% by weight or less, more preferably 4% by weight, so that the mixing ratio of the ultrafine fibers does not increase and the space for holding dirt does not decrease.
0% by weight. This ultrafine fiber may be obtained by mechanically dividing it, or may be obtained by chemically dividing it, but if it is an ultrafine fiber obtained by mechanically dividing, Since it can be entangled at the same time as division, the degree of entanglement is higher,
It is preferable because abrasion resistance is further improved.

Explaining the method of mechanically splitting to obtain ultrafine fibers, the easily splittable fibers that mechanically split into ultrafine fibers are made of two or more kinds of resins, for example, one component There are chrysanthemum-type fibers having a cross-sectional shape radially arranged between other components, or bimetal-type fibers having a cross-sectional shape in which different components are alternately laminated in layers. The ultrafine fibers generated from these easily splittable fibers have a sharp cross-sectional shape portion and are therefore excellent in wiping property. Regarding the combination of resin components constituting the easily splittable fiber, examples of the combination of two types of resin components are polyamide resin and polyester resin, polyamide resin and polyolefin resin, polyamide resin and polyacrylonitrile resin. There are combination resins, polyester resins and polyolefin resins, polyester resins and polyacrylonitrile resins, and combinations of polyolefin resins and polyacrylonitrile polymer resins. When the organic solvent such as thinner is used for wiping, the easily splittable fiber in which the polyester resin and the polyolefin resin are combined is excellent in affinity with the organic solvent and thus can be preferably used.

From the above, the coarse layer of the present invention comprises 50 to 60% by weight of thick fibers having a fineness of 1 to 5 denier, 10 to 30% by weight of thick fibers having a fineness of 5 denier or more, and fineness generated from easily splittable fibers. 10-40 with split fibers of 0.8 denier or less
Most preferably, it is included by weight.

Further, as the thick fibers of the coarse layer, the heat-fusible fibers are mixed, and the non-woven fabric is formed and then fused, whereby a wiping material having more excellent morphological stability can be obtained. This heat-fusible fiber may be composed of a single component, but if it is a composite type composed of two or more kinds of resin components such as a side-by-side type, a core-sheath type, an eccentric type, etc. Since the strength is maintained by the resin component that does not exist, it is more excellent in shape stability and can be suitably used.
As an example of a combination of resin components constituting the composite heat-fusible fiber, two nylon resin components are exemplified: 6 nylon / polyethylene, polypropylene / polyethylene, polypropylene / ethylene-vinyl acetate copolymer, There are combinations of polyester / polypropylene, polyester / polyethylene, 6 nylon / 66 nylon, polyester / polyester copolymer, high density polyethylene / low density polyethylene and the like.

The dense layer of the wiping material of the present invention has a fineness of 0.8.
Since it is mainly composed of ultrafine fibers of denier or less, it has excellent wiping properties. The ultrafine fibers may be obtained by mechanically or chemically dividing them, or may be obtained by a microspun bond method. Among these, the ultrafine fibers obtained by mechanically dividing can be preferably used because they are entangled at the same time as being divided and have abrasion resistance. As the easily splittable fibers that are mechanically split to produce ultrafine fibers, the same easily splittable fibers that can be used in the rough layer can be used. The presence ratio of the ultrafine fibers in the dense layer is preferably 60% by weight or more, and more preferably 80% by weight or more so that the wiping property is excellent.

The wiping material of the present invention is mainly composed of the thick fibers as described above, and is laminated with a fiber web which is a coarse layer and a fiber web which is a dense layer mainly of ultrafine fibers, and is then formed with an opening. It was done. Examples of the method for forming the fibrous web include a dry method such as a card method and an air lay method, a wet method, and a direct spinning method such as a spun bond method and a micro spun bond method. Among these, the dry method or the wet method is a suitable method for forming a fiber web because it can uniformly disperse two or more kinds of fibers.
When forming a fiber web by the card method,
It is preferable that the unidirectional fiber web is a fiber web crossed with the flow direction by a cross layer or the like so that it has excellent strength in the vertical direction and the transverse direction and can be wiped regardless of the direction. Further, the fiber web to be a rough layer and the fiber web to be a dense layer may be laminated in any manner,
It is preferable to laminate a fibrous web which is a dense layer so that at least one surface of the wiping material is a dense layer so that the wiping material can be wiped with the dense layer. Further, the weight ratio of the fibrous web as the rough layer and the fibrous web as the dense layer is preferably set to 1: 0.5 to 2 so that the coarse layer can easily retain dirt.

Next, by forming an opening in the laminated fiber web, dirt can be transferred to and retained in the coarse layer through the opening, and the opening and the non-opening can be formed. The wiping material has excellent wiping properties at the boundary. As a method of forming the opening, for example, there is a method of punching with an embossing roll or a method of applying a water flow. Among these, the latter method makes it possible to entangle the entire fibrous web, so that it is more excellent in abrasion resistance, and the fibers that were present at the locations where the holes were formed by the action of the water flow Pushed around the aperture,
Therefore, the wiping material becomes bulky and excellent in workability, and thus it is a preferable method. In addition, since the easily splittable fibers described above can be split and entangled at the same time by applying a water stream, this is also a preferable method in the manufacturing process.

The opening can be formed by using a net having a large opening or a perforated plate as a support on which the fibrous web is placed and applying a water flow. For example, it can be formed by using a coarse net of 50 mesh or less and pushing the fibers existing on the net into the openings of the net by a water stream. In order to make the openings formed by this net clearer, it is preferable to use a net of 40 mesh or less, and more preferably 30 mesh or less. In addition, after using two or more kinds of supports having different sizes of the opening, first forming the openings by using the support having the large opening, the support having the smaller opening is used. It may be used to rearrange the fibers to form apertures in the nonwoven. The conditions for operating this water flow are, for example, a nozzle diameter of 0.
A water flow having a water pressure of 10 to 300 kg / cm ² may be jetted from a nozzle plate arranged in one or more rows with a pitch of 0.5 to 0.3 mm and a pitch of 0.2 to 3 mm. Further, the action by the water flow does not have to be performed once, and may be performed twice or more, or may be performed not only on one side but on both sides.

The wiping material thus obtained is
The unit weight is preferably 50 g / m ² or more so as to be bulky and excellent in workability, and is preferably 200 g / m ² or less so that a nonwoven fabric having an opening can be easily manufactured. A more preferable basis weight is 70 to 100 g / m ² .

The wiping material of the present invention may be used as it is, or may be used by impregnating it with a solution containing a surfactant or an organic solvent such as thinner depending on the type of dirt to be wiped.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0018]

(Example) A chrysanthemum-shaped fiber cross section obtained by dividing a polyester component (fineness after splitting of 0.39 denier) into 6 parts with a polypropylene component (fineness after splitting of 0.69 denier) extending radially from the fiber axis. A unidirectional fiber web obtained by opening 100% by weight of a 7-dividable easily-dividable fiber (fineness 3 denier, fiber length 51 mm) with a card machine with a cross layer and having a basis weight of 40 g / m 2. A crossed fiber web A of ² was obtained. On the other hand, 55% by weight of rayon fiber (fineness: 1.5 denier, fiber length: 38 mm), 25% by weight of rayon fiber (fineness: 7 denier, fiber length: 51 mm), and the same 7-dividable easily splittable fiber (fineness: 3) Denier, fiber length 5
(1 mm) 20% by weight was mixed and the unidirectional fiber web obtained by opening with a card machine was crossed with a cross layer to obtain a crossed fiber web B having a basis weight of 40 g / m ² . Then, the crossed fiber web A is laminated on the crossed fiber web B,
After being placed on a 15-mesh net-shaped support, a 90 kg / cm ² water flow was ejected twice from a nozzle plate located above the crossed fiber web A and having a nozzle diameter of 0.13 mm and a pitch of 0.6 mm, The easily splittable fiber was divided and entangled, and at the same time an opening was formed to obtain a wiping material having a basis weight of 80 g / m ² . When a load of 800 g / cm ^{2 was} applied to this wiping material to wipe 100 g / m ² of ink hung on the polyester film, 98% of the ink could be wiped and the wiping property was excellent.

(Comparative Example) When jetting a water stream, except that a 100-mesh net-like support was used, the procedure is exactly the same as in the example, and there is no apparently open hole portion, and the basis weight is 80 g / m ^2.
The wiping material was obtained. When the ink was wiped off with this wiping material in the same manner as in the example, 20% of the ink remained and the wiping property was poor.

[0020]

The wiping material of the present invention has a dense layer mainly composed of ultrafine fibers of 0.8 denier or less.
It has excellent wiping properties, and also has an opening, and since the boundary between the opening and the non-opening can be made to act sharply on the object to be cleaned, it has better wiping properties. Moreover, since the wiped dirt can be moved to and held in the rough layer through the opening, a large amount of dirt can be wiped off.

Claims (5)

[Claims] 1. A non-woven fabric comprising a coarse layer mainly composed of thick fibers of 1 denier or more and a dense layer mainly composed of ultrafine fibers of 0.8 denier or less, and comprising an opening portion. Characteristic wiping material. 2. The wiping material according to claim 1, wherein ultrafine fibers are mixed and entangled in the rough layer. 3. The wiping material according to claim 1, wherein the rough layer contains thick fibers having a fineness of 5 denier or more. 4. The wiping member according to any one of claims 1 to 3, wherein the thick fibers forming the rough layer are hydrophilic fibers. 5. The wiping member according to claim 1, wherein the opening portion is formed by a water flow.