JP2004076248A - Melt-blown nonwoven fabric, laminated melt-blown nonwoven fabric and wiper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melt-blown nonwoven fabric with peculiar rustle feeling, a laminated melt-blown nonwoven fabric and to provide a wiper suitable for matters or persons. <P>SOLUTION: The melt-blown nonwoven fabric with hard surface and excellent wear resistance is obtained by containing connecting fibers (3) forming connected parts (4) by mutually adhering to each other at least a part in the length direction of the fiber by bundling more than one adjacent melt-brown filaments (2) in the melt-blown web (1). The wiper excellent in wiping property to sticking stains is obtained by composing the wiping surface with the melt-blown web (1). <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a melt-blown non-woven fabric and a laminated melt-blown non-woven fabric having a peculiar texture, and more particularly to glass, metal, plastic, household or commercial objects used for wiping and polishing of tiles, or for skin. The present invention relates to a wiper suitable for personal use, which is used for wiping keratin and sticky dirt.

汚 れ In many cases, dirt stuck on window glass, bathroom tiles, floor plastic tiles, tableware, sinks, ranges, etc. cannot be completely removed with a conventional nonwoven wiper impregnated with a cleaning agent. Therefore, a wiper impregnated with a cleaning agent mixed with abrasive fine particles or a wiper in which abrasive fine particles are fixed to a nonwoven fabric has been used.

On the other hand, nonwoven fabrics for wipers are known to be formed by superposing a hydrophilic layer for holding a detergent and a hydrophobic layer for wiping off dirt, and using a meltblown nonwoven fabric for the hydrophobic layer. For example, Japanese Patent Application Laid-Open No. 6-99533 (Patent Document 1) describes an example of a wiping cloth made of a laminated composite of a melt blown nonwoven fabric and a nonwoven fabric having water retention properties. JP-A-6-294060 (Patent Document 2) describes an example in which a composite nonwoven fabric obtained by combining a hydroentangled nonwoven fabric and a meltblown nonwoven fabric is used for a disposable rag. Japanese Patent Application Laid-Open No. H10-57292 (Patent Document 3) describes an example in which a hydroentangled nonwoven fabric whose one surface is a meltblown nonwoven fabric is used as a cleaning sheet for manufacturing precision equipment. JP-A-11-343500 (Patent Document 4) describes a cleaning sheet in which a mixed nonwoven fabric of lipophilic fiber and hydrophilic fiber and a meltblown nonwoven fabric are laminated.

Further, Japanese Patent Application Laid-Open No. 2000-93382 (Patent Document 5) discloses that a thermoplastic fiber sheet is subjected to a heat treatment to solidify a molten component into a nodular shape on a fiber to form a nodular solid, and to adhere to the nodular solid on the fiber surface. Polishing sheets have been proposed that polish the soil that has been polished, and then retain the polished soil in entanglement with the fibers of a bulky nonwoven web.

JP-A-6-99533 JP-A-6-294060 JP-A-10-57292 JP-A-11-343500 JP 2000-93382 A

However, the wiper has the following problems. For example, in JP-A-6-99533, JP-A-6-294060, JP-A-10-57292 and JP-A-11-343500, the wiping surface is too soft because a normal melt blown nonwoven fabric is used. It is not suitable for removing firmly adhered dirt. In addition, as in JP-A-2000-93382, since the knob-like solid provided on the surface of the single fiber is very small, strong dirt cannot be easily removed. Further, it is not easy to form a nodular solid of the molten resin on the surface of the fiber by a normal heat treatment method such as a hot air treatment or a hot roll treatment.

The present invention has been made in view of such problems, and has a unique nonwoven fabric surface that is hard to achieve with a conventional meltblown nonwoven fabric having a soft nonwoven fabric surface, has a unique texture that is cut down, and has excellent wear resistance. The purpose is to provide. In particular, to provide a wiper capable of wiping or polishing dirt sticking to glass, metal, plastic, tile, or the like without using abrasive fine particles, or a wiper usable for wiping a human body such as skin keratin or sticky dirt. With the goal.

The present inventors have found that a plurality of melt-blown single fibers are bundled together in a melt-blown web to form connected fibers, so that the non-woven fabric has a hard surface, has a unique texture of squat, and has excellent wear resistance. The present inventors have found that a laminated melt-blown nonwoven fabric and a wiper capable of wiping and polishing the adhered dirt are obtained. That is, the melt-blown nonwoven fabric of the present invention includes, in the melt-blown web, a plurality of adjacent melt-blown single fibers bundled together, and at least a portion in the fiber length direction includes connecting fibers forming a connecting portion bonded to each other. It is characterized by.

The laminated melt blown nonwoven fabric of the present invention is characterized in that the melt blown web is laminated with another fiber aggregate, and the melt blown web constitutes at least one surface.

ワ イ The wiper according to the present invention is characterized by comprising the melt blown nonwoven fabric or the laminated meltblown nonwoven fabric, wherein the surface of the meltblown web constitutes a wiping surface.

洗浄 The cleaning wiper of the present invention is characterized in that a detergent is applied to the melt blown nonwoven fabric or the laminated meltblown nonwoven fabric.

The melt-blown nonwoven fabric of the present invention has a unique texture in which the surface of the non-woven fabric is hard, has a unique texture of being slid down, and has excellent abrasion resistance by forming a plurality of melt-blown single fibers bound together and bonded fibers in the melt-blown web. A nonwoven fabric is obtained, which is useful for applications such as wipers and filters.

The laminated melt-blown nonwoven fabric of the present invention can impart a function such as hydrophilicity by being laminated with another fiber aggregate while the melt-blown web forms at least one surface, and retains a liquid or the like, for example. Useful for

The wiper of the present invention is characterized in that the melt blown web constitutes a wiping surface, so that a wiper capable of wiping or polishing dirt stuck to glass, metal, plastic, tile, or the like without using abrasive fine particles, or a keratin of skin or It is useful for a wiper that can be used for wiping a human body such as sticky dirt.

洗浄 The cleaning wiper of the present invention can improve the cleaning effect on the dirt on the target surface by applying a cleaning agent to the nonwoven fabric. Further, in the laminated melt blown nonwoven fabric, by using an open nonwoven fabric as the other fiber aggregate, the foaming property of the detergent is excellent, and the effect of cleaning the surface of the object can be further improved.

メ ル The melt-blown nonwoven fabric of the present invention includes connecting fibers in which a plurality of adjacent melt-blown single fibers are bundled together, and at least a part in the fiber length direction forms a connecting portion where the fibers are bonded to each other. The term “multiple bundles” in the connection fibers refers to a state in which about 2 to 20 single fibers are bundled and aggregated. The preferred number of convergence is 2 to 10. The portions where the fibers are bundled and in which the fibers are in contact with each other are mainly bonded to form a connecting portion. The bonding at the connecting portion may be performed by melting a resin constituting the single fiber, and may be formed at least in part in the fiber length direction, or may be formed in the entire length direction. It is preferable that the connecting portion is formed over 1 mm or more in the fiber length direction. A more preferable length of the connecting portion is 3 mm or more. When the length of the connecting portion is 1 mm or more, the strength of the connecting portion is improved, the fiber strength is improved, and thus the surface of the nonwoven fabric is hard, and has a unique texture that is cut down, and a melt-blown nonwoven fabric having excellent wear resistance is obtained. can get. In addition, the said connection part can be confirmed if the nonwoven fabric surface is enlarged 30 times or more with an electron microscope.

Hereinafter, the melt blown nonwoven fabric of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic view of the surface of the melt blown nonwoven fabric of the present invention. The melt-blown nonwoven fabric of the present invention forms a connecting portion (4) in the melt-blown web (1) in which a plurality of melt-blown single fibers (2) are bundled together and at least a part in the fiber length direction is mutually bonded. Connecting fibers (3).

連結 The connecting fibers are preferably bonded at intersections with the fibers constituting the melt blown web. Further, it is preferable that the entire fiber constituting the melt blown web is melted and adhered. Adhesion between the connecting fibers and the fibers constituting the meltblown web results in a nonwoven fabric having a harder surface, a unique texture that is cut down, and has excellent abrasion resistance, which is preferable.

連結 When the surface of the nonwoven fabric is magnified 40 times with an electron microscope, it is preferable that three or more connection fibers are present in the surface layer portion of the nonwoven fabric per 1 mm square. The nonwoven fabric surface layer means a range that can be visually recognized when the surface of the nonwoven fabric is photographed with an electron microscope. A more preferable amount of the connecting fiber is 5 or more in the surface layer portion of the nonwoven fabric. When the amount of the connecting fibers is less than three in the surface layer of the nonwoven fabric, the surface of the nonwoven fabric is hard, and the unique texture of the woven fabric cannot be exhibited, and the abrasion resistance tends to be inferior. This is because it is inferior in wiping off the adhered dirt. The connecting fibers are preferably present not only in the surface layer of the nonwoven fabric but also in the nonwoven fabric where the connecting fibers and the melt-blown single fibers are superimposed and adhered to each other.

The melt-blown non-woven fabric made of the melt-blown web has a hard non-woven surface and a rough feel, and is different from a conventional melt-blown non-woven fabric in which single fibers are simply accumulated one by one. It is possible to obtain a wiper that works effectively for wiping off the dirt. The detailed contents of the melt blown nonwoven fabric of the present invention will be described together with an example of a production method.

The resin used in the melt-blown nonwoven fabric of the present invention is not particularly limited as long as it is a resin having a melt-blown fiber forming property such as a polyester resin, a polyamide resin, a polyolefin resin, and a polyurethane resin. It is preferable to use a resin having a low softening point and a low crystallization rate. According to the resin, the melt blown fiber spun from the spinning nozzle is used for a conveyor (used for conveying a web or for forming a pattern) or a conveyor. Even if the resin temperature is lowered before contact with other fiber aggregates placed on the resin, the resin fibers are still in a softened or molten state, so that the single fibers are bundled together and adhered to obtain a connected fiber. Can be preferred. Examples of the resin include copolymerized polyester and polybutene-1. In particular, polybutene-1 is easy to be bundled during spinning to form a bonded portion which is bonded to each other, and is bonded to a fiber constituting the melt blown web. Not only is it easy to perform, but also a suitable nonwoven fabric surface hardness, specifically a nonwoven fabric surface hardness suitable for wiping sticking dirt, is preferable.

繊 維 The fiber form of the melt-blown nonwoven fabric of the present invention may be a single fiber or a conjugate fiber, and the cross-sectional shape of the fiber may be any of circular, irregular, and hollow. In order to efficiently spin the connecting fiber during melt-blow spinning, it is necessary to use two or more resins with different melting points (a low-melting resin and a high-melting resin with a higher melting point than the low-melting resin). It is preferable to use a conjugate fiber having a cross-sectional structure such as a mold, a multi-layer, or a split mold, in which a low melting point resin is arranged so as to occupy a majority of the fiber surface. The most preferred fiber form is a composite fiber in which the low melting point resin completely covers the fiber surface. According to the above-described conjugate fiber, not only can the connection fiber be stably obtained, but also when laminated with another fiber aggregate described later, the conjugate fiber is accumulated in a softened or molten state that is not yet solidified while being spun. This is because sometimes the adhesiveness with other fiber aggregates is excellent, or the adhesiveness by heat treatment or the like after laminating a melt blown web made of a conjugate fiber and another fiber aggregate.

The two or more resins having different melting points constituting the conjugate fiber are preferably conjugate fibers composed of a low-melting resin and a high-melting resin having a melting point higher by 10 ° C. or more than the low-melting resin. According to such a configuration, the connection fiber can be stably obtained.

組 み 合 わ せ The combination of two or more resins having different melting points is not particularly limited, but a combination of polybutene-1 and polypropylene or a combination of polybutene-1 and polyester is preferable in view of spinnability.

す る に は In order to efficiently spin the connected fibers during melt-blow spinning, it is preferable that the interval between the discharge holes of the spinning nozzle (the distance between the centers of the discharge holes) is in the range of 0.5 to 8 mm. A more preferable discharge hole interval is in the range of 0.6 to 2 mm. If the interval between the discharge holes of the spinning nozzle is less than 0.5 mm, it is difficult to fabricate the spinning nozzle itself. If the interval between the discharge holes exceeds 8 mm, adjacent single fibers are placed on a conveyor or another fiber assembly placed on the conveyor. This is because it is difficult to converge and adhere before contact with an object.

In the melt-blown nonwoven fabric of the present invention, it is preferable to spin the melt-blown single fiber itself so that the average fiber diameter becomes 10 μm or more, and adjust the average fiber diameter by increasing the discharge rate and reducing the flow rate of hot air. It is possible. A more preferable lower limit of the average fiber diameter is 12 μm. A more preferred lower limit of the average fiber diameter is 15 μm. The preferred upper limit of the average fiber diameter is 30 μm. A more preferable upper limit of the average fiber diameter is 25 μm. The average fiber diameter referred to here is a median value obtained by measuring the diameter of 150 fibers when the surface of the nonwoven fabric is magnified 500 times with an electron microscope. However, in the case where the boundary of the connection portion in the connection fiber was visually recognizable by an electron microscope, each was divided into single fibers and measured.

The average fiber diameter can also be adjusted by lowering the melt viscosity of the resin to be spun. For example, the melt flow rate (MFR; g / 10 min) (according to JIS-K-6760) is measured at 230 ° C. when the melting point of the resin is 200 ° C. or less, and 290 ° C. when the melting point of the resin exceeds 200 ° C. Is preferably 2.16 kg (21.2 N)), and a resin satisfying 5 <MFR <200 is preferably used.

距離 The distance between the spinning nozzle and the conveyor or fiber aggregate is preferably 5 to 30 cm. A more preferable distance is 10 to 20 cm. If the distance between the spinning nozzle and the conveyor or the fiber aggregate is less than 5 cm, cooling after spinning is insufficient, making it difficult to maintain the fiber shape, and the nonwoven fabric itself may be film-like and the texture may be too hard. is there. If the distance between the spinning nozzle and the conveyor or the fiber aggregate exceeds 30 cm, there is a possibility that the fibers constituting the melt blown web may have insufficient adhesion.

In order to obtain the melt blown nonwoven fabric of the present invention, it is possible to adjust the distance between the spinning nozzle and the conveyor, the flow rate and speed of air, and the discharge amount of molten resin per nozzle single hole. As a specific example, when the distance between the spinning nozzle and the conveyor is 15 cm, the air flow rate is 5 m ³ / min or more, the air speed is about 100 m / sec, and the discharge rate is about 0.3 g / hole · min. .

In the present invention, the melt blown fiber may be directly blown onto a conveyor to form a melt blown web in which the fibers are bonded to each other, or the melt blown fiber may be blown onto another fiber aggregate placed on the conveyor to form a melt blown web. The melt-blown fibers may be bonded together and joined to fibers constituting another fiber aggregate.

Melt blown web accumulated on the conveyor, or on another fiber aggregate placed on the conveyor, if necessary, hot-bonding machine, hot-rolling machine, etc. Thus, the hardness of the nonwoven fabric surface can be adjusted. When laminated with another fiber aggregate, the adhesion between the melt blown web and the other fiber aggregate can be improved, which is preferable.

The melt blown nonwoven fabric of the present invention preferably has a basis weight of 10 to 200 g / m ² . The more preferable melt-blown nonwoven fabric weight is 15 to 80 g / m ² . If the basis weight of the melt blown nonwoven fabric is less than 10 g / m ² , the strength of the nonwoven fabric is reduced, and the nonwoven fabric may be broken during use. If the basis weight of the meltblown nonwoven fabric exceeds 200 g / m ² , the fibers are too dense and the surface of the nonwoven fabric becomes smooth, and when used as a wiper, there is a possibility that the wiped property of sticky dirt may be poor.

For example, when used as a laminated meltblown nonwoven fabric described later, if the wiper is for an object such as a window glass, a kitchen sink, a range, an oven, a washbasin, a bathroom tile, etc., the basis weight of the meltblown nonwoven fabric is 30 to 80 g / m ^2. Is appropriate. In addition, if the wiper is a personal wiper used for wiping skin keratin and sticky dirt, the meltblown nonwoven fabric preferably has a basis weight of 15 to 60 g / m ² .

The melt-blown nonwoven fabric of the present invention may be laminated with a fiber aggregate, a film, and the like, if necessary.Especially, in the laminated melt-blown nonwoven fabric of the present invention, the melt-blown web is laminated with another fiber aggregate, What a web comprises at least one surface is used. Other fiber aggregates to be laminated with the meltblown web include non-woven fabrics, woven and knitted fabrics, nets, and the like. In particular, when the laminated melt blown nonwoven fabric of the present invention is used as a wiper, it is preferably a hydrophilic fiber aggregate containing 30% by mass or more of hydrophilic fibers. By containing the hydrophilic fiber in an amount of 30% by mass or more, it is possible to sufficiently retain a chemical solution such as moisture and a detergent. A more preferable content of the hydrophilic fiber in the hydrophilic fiber aggregate is 50% by mass or more.

親水 The hydrophilic fiber may be a commonly used fiber such as rayon, natural cotton, cupra, etc. In particular, rayon fiber is suitable for use because its fineness and fiber length can be easily set. The hydrophilic fiber may be 100% by mass, but it is also possible to increase the strength and hardness of the nonwoven fabric by mixing other fibers of 70% by mass or less. As other fibers, polypropylene, polyethylene, polyester and the like are suitable for heating above the melting point to bond adjacent hydrophilic fibers and increase the tensile strength and bulkiness of the nonwoven fabric. In particular, a composite fiber composed of two components is advantageous for heat bonding and reinforcing the hardness and strength of the nonwoven fabric. For example, a parallel-type or sheath-core type heat-adhesive conjugate fiber using polyethylene as a heat-adhesive component and polypropylene or polyester as a reinforcing component can be used.

繊 維 The fiber aggregate containing the hydrophilic fibers is preferably a nonwoven fabric, and may be any of a card web, an air lay web, a wet papermaking web, a spunbond web, and the like. For example, in the case of a card web, it can be subjected to needle punching or hydroentanglement treatment to obtain a hydrophilic nonwoven fabric, and in the case of including the heat-adhesive conjugate fiber, hot air treatment, hot roll treatment alone, or needle punching or hydroentanglement The treatment can be used in combination to form a hydrophilic nonwoven fabric. In particular, a hydroentangled nonwoven fabric is preferable since a nonwoven fabric having good water retention can be obtained. In addition, the shape of the nonwoven fabric may be one having a plain (smooth) surface or one having irregularities, and is not particularly limited. According to the hydroentangled nonwoven fabric, various uneven patterns can be formed, which is preferable. For example, when the surface of the hydro-entangled nonwoven fabric has streaky irregularities, similar streaks may be formed on the meltblown web formed on the hydroentangled nonwoven fabric.

繊 The fineness of the hydrophilic fiber is preferably 1 to 2.5 dtex. The fiber length of the hydrophilic fiber may be set according to a desired web forming method. In the case of a card web, it may be about 25 to 60 mm.

The basis weight of the hydrophilic nonwoven fabric is preferably 15 to 100 g / m ² . If the basis weight of the hydrophilic nonwoven fabric is less than 15 g / m ² , there is a possibility that the wiper may have insufficient ability to retain a detergent, moisture, and the like necessary for the wiper. When the basis weight exceeds 100 g / m ² , for example, when used for a wiper, operability may be deteriorated. For example, when used for an object wiper such as a window glass, a kitchen sink, a range, an oven, a washbasin, and a bathroom tile, the basis weight of the hydrophilic nonwoven fabric is suitably ²⁰ to 50 g / m ² . In addition, if the wiper is a personal wiper used for wiping skin keratin or sticky dirt, the basis weight of the hydrophilic nonwoven fabric is suitably 30 to 80 g / m ² .

開 As another fiber aggregate that can be used for the laminated melt-blown nonwoven fabric of the present invention, it is preferable to use an apertured nonwoven fabric. By using the above-mentioned open nonwoven fabric, it is possible to obtain a wiper which is excellent in foaming property when a cleaning agent is applied, and which is excellent in wiping property against dirt on a target surface.

It is preferable that the open nonwoven fabric includes a hole having a length in at least one direction of 1 mm or more and 3 mm or less. Within such a range, excellent foaming properties can be obtained.

The thickness at a load of 2.94 cN / cm ² of the laminated melt blown nonwoven fabric on which the open nonwoven fabric is laminated is preferably 1 mm or more. When the thickness of the laminated melt-blown nonwoven fabric is 1 mm or more, the foaming property is improved, and the tactile sensation and hand feeling when used in a wet state are improved.

In order to obtain an open nonwoven fabric having the above-described pore size and thickness, for example, a filament having a wire diameter in a range of 0.2 mm or more and 2 mm or less is woven in a range of 5 mesh or more and 30 mesh or less. It is preferable to place a fibrous web on a net of plain weave or the like, jet a stream of water to entangle the fibers and rearrange them to provide openings corresponding to the knuckles of the net.

繊 維 Fibers constituting the perforated nonwoven fabric are not particularly limited, but it is preferable that the above-mentioned hydrophilic fibers be constituted by 30% by mass or more in consideration of the retention of the detergent. In addition, in order to maintain the thickness of the nonwoven fabric, it is preferable to mix synthetic fibers such as polyester fibers. When a certain strength is required for the perforated nonwoven fabric, a binder component such as a heat-adhesive fiber may be mixed as necessary. Specifically, it is preferable that the content of the hydrophilic fiber is 30 to 80% by mass, the content of the polyester fiber is 10 to 60% by mass, and the content of the thermoadhesive fiber is 10 to 60% by mass.

As another method for obtaining the laminated melt-blown nonwoven fabric of the present invention, the melt-blown nonwoven fabric of the present invention may be prepared, and then laminated and joined to a separately prepared hydrophilic nonwoven fabric. Bonding methods include a method in which the nonwoven fabric is reheated by heat treatment and the resin is self-bonded, a method in which the low-melting fiber on the surface of the meltblown nonwoven fabric is melt-bonded by hot roll embossing, and a hot air or Although there is a processing method using a roll or the like, when a hot roll is used, the bulk of the melt blown nonwoven fabric may be reduced. Therefore, the basis weight is preferably at least 20 g / m ² .

Hereinafter, the laminated melt blown nonwoven fabric of the present invention will be described with reference to the drawings. FIG. 2 is a schematic cross-sectional view of a nonwoven fabric obtained by using a hydroentangled nonwoven fabric as the hydrophilic nonwoven fabric (5), spinning meltblown fibers from above and laminating the meltblown web (1), and cutting the nonwoven fabric at right angles to the machine direction. . A plurality of melt-blown single fibers (2) adjacent to each other in a melt-blown web (1) laminated on a hydrophilic nonwoven fabric (5) are bundled together, and at least a part in a fiber length direction is bonded to each other. (4) is included. In addition, the fibers constituting the meltblown web (1) are bonded together, and the fibers constituting the hydrophilic nonwoven fabric (5) and the meltblown fibers are joined and adhered.

Next, the wiper of the present invention is composed of the melt blown nonwoven fabric or the laminated meltblown nonwoven fabric, and the surface of the meltblown web constitutes a wiping surface. In the melt blown web, since the connecting fibers are present on the wiping surface, the connecting fibers have an effect of forming fine irregularities on the surface of the nonwoven fabric, and thus are particularly effective for hard dirt. It is possible to obtain a wiper capable of wiping dirt adhered to plastics, tiles and the like, and polishing.

In the wiper, the hardness of the surface of the melt blown web, that is, the ability to wipe off sticky dirt is substituted by the tensile force (T) on the nonwoven fabric surface measured by the following evaluation method.
[Non-woven fabric surface tension]
A sample having a width of 10 cm and a length of 10 cm is prepared on a mat (acrylic plate manufactured by KOKUYO Co., Ltd., product number MA-268N) placed on a horizontal table, and placed so that the melt blown web surface is in contact with the mat surface. A sample having a mass of 900 g and a bottom area of 29.25 cm ² (6.5 cm long, 4.5 cm wide) is placed on the sample, the sample is pulled horizontally, and the force T (N) when the sample starts moving is measured. The measurement was performed using a digital force gauge (model name: AD-4923-50-N) manufactured by A & D Corporation.

(4) The greater the pulling force (T), the greater the resistance to movement against the surface to be wiped, indicating that the melted blown web firmly captures the adhered dirt and wipes it off. And it is preferable that the said pulling force (T) is 4N or more. By setting the pulling force (T) to 4N or more, it works effectively when the dirt stuck as a wiper is wiped off. When a pattern such as unevenness is formed on the surface of the wiper, it is preferable to measure the average in the vertical direction and the horizontal direction of the wiper.

FIG. 3 is a diagram showing a method for measuring the effect of wiping off dirt in the wiper of the present invention. The wiper (8) of the present invention is placed on a mat (7) (manufactured by KOKUYO Co., Ltd., product number MA-268N) with the melt blown web (1) face down on a mat (7) placed on a horizontal table (6), A weight (9) of 900 g is placed on the nonwoven fabric (5). A pull string (10) is attached to the end of the wiper and joined to a measuring device (11). This is pulled in the horizontal direction, and the force when it starts moving is read by a measuring device.

ワ イ The wiper of the present invention is preferably used as a cleaning wiper after being provided with a cleaning agent. Examples of the detergent include nonionic surfactants, zwitterionic surfactants, cationic surfactants, and anionic surfactants, which have a cleaning effect. The ratio (content) of the detergent in the nonwoven fabric is preferably 10% by mass or more. When the cleaning agent is diluted with water or the like and impregnated as a cleaning liquid and used as a wet (wet) wiper, the cleaning liquid is preferably 100 to 800% by mass based on the mass of the nonwoven fabric.

Hereinafter, examples and comparative examples of the melt-blown nonwoven fabric, the laminated melt-blown nonwoven fabric, and the wiper using the same will be described.

[Example 1]
100% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., fiber length 40 mm, fineness 1.7 dtex) as a hydrophilic nonwoven fabric, and a card web having a basis weight of 40 g / m ² are subjected to high pressure water entanglement treatment at a water pressure of 4 MPa and a nozzle interval of 1 mm, and are weighted. A hydroentangled nonwoven fabric of 40 g / m ² was obtained.

Next, the hydroentangled nonwoven fabric was placed on a belt conveyor of a nonwoven fabric manufacturing machine of a melt blowing method, and operated at a speed of 4.4 m / min. From above, polybutene-1 (trade name: Tuffmer, manufactured by Mitsui Chemicals, Inc.) A sheath-core composite fiber having a melting point of 123 ° C., MFR of 28 g / 10 min, and a density of 0.92 g / cm ³ ) having a sheath component of polypropylene having a melting point of 163 ° C. and a core component of a spinning nozzle having a discharge hole interval of 0.8 mm. From the arranged spinning nozzle, melt-blowing at a spinning temperature of 290 ° C., an air flow rate of 8.8 m ³ / min, an air speed of 156 m / sec, a discharge rate of 0.2 g / hole / min, and a distance of 17 cm between the spinning nozzle and the conveyor, the meltblown web to obtain a hydroentangled nonwoven fabric are integrated with softened molten state by joining layers on multilayer meltblown nonwoven fabric was without a wiper of the present invention having a basis weight of 100 g / m ²

In the wiper, the sheath-core type composite fiber and the rayon fiber were adhered by the polybutene-1 resin, and the melt blown web and the hydro-entangled nonwoven fabric could not be easily separated. The melt blown web is rough and uneven, and when viewed with an electron microscope at a magnification of 40 times, it is in a fiber state as shown in FIG. 1, and about 2 to 5 adjacent melt blown single fibers are bundled and the fiber length is increased. There were nine connecting fibers per square having a length of 3 mm or more in the longitudinal direction and forming connecting portions bonded to each other over a length of 3 mm. The average fiber diameter of the melt blown single fibers was about 17 μm. Further, it had a nonwoven fabric cross section as shown in FIG. 2, and the fibers constituting the melt blown web including the connecting fibers were bonded to each other.

[Example 2]
As the hydrophilic nonwoven fabric, a sheath-core composite fiber of 35% by mass of rayon fiber of Example 1, a sheath component of polyethylene and a core component of polypropylene (manufactured by Daiwa Spinning Co., Ltd., trade name: NBF (H), fiber length 38 mm, fineness) 1.5 dtex) A card web having a basis weight of 40 g / m ² mixed with 65% by mass was treated with hot air at 140 ° C., and a hydrophilic nonwoven fabric having a thickness of 0.5 mm was used. The wiper of the present invention was used. In this case, as in Example 1, the two nonwoven fabric layers did not easily peel off. The melt blown web is rough and uneven, and when viewed with an electron microscope at a magnification of 40 times, it is in a fiber state as shown in FIG. 1, and about 2 to 5 adjacent melt blown single fibers are bundled and the fiber length is increased. There were eight connecting fibers per square having a length of 3 mm or more in the longitudinal direction and forming connecting parts bonded to each other. The average fiber diameter of the melt blown single fibers was about 16 μm.

[Example 3]
The hydroentangled nonwoven fabric of Example 1 was placed on a belt conveyor of a melt-blowing nonwoven fabric manufacturing machine, and operated at a speed of 18.7 m / min, from which polybutene-1 (trade name: Tuffmer, manufactured by Mitsui Chemicals, Inc.) A sheath-core composite fiber having a melting point of 123 ° C., MFR of 28 g / 10 min, and a density of 0.92 g / cm ³ ) having a sheath component of polypropylene having a melting point of 163 ° C. and a core component of a spinning nozzle having a discharge hole interval of 0.8 mm. Melt blow spinning from the arranged spinning nozzle at a spinning temperature of 290 ° C., an air flow rate of 8.8 m ³ / min, an air speed of 156 m / sec, a discharge rate of 0.2 g / hole / min, and a distance of 17 cm between the spinning nozzle and the conveyor. The web was accumulated on a hydroentangled nonwoven fabric in a softened and melted state, and the layers were joined to obtain a laminated melt blown nonwoven fabric, which was a wiper of the present invention having a basis weight of 55 g / m ² .

も In this case, as in Example 1, both nonwoven fabric layers were not easily peeled off. The melt blown web is rough and uneven, and when viewed with an electron microscope at a magnification of 40 times, it is in a fiber state as shown in FIG. 1, and about 2 to 5 adjacent melt blown single fibers are bundled and the fiber length is increased. There were 10 connecting fibers per 1 mm square forming connecting portions bonded to each other over a length of 3 mm or more in the length direction. The average fiber diameter of the melt blown single fibers was about 17 μm. Further, it had a nonwoven fabric cross section as shown in FIG. 2, and the fibers constituting the melt blown web including the connecting fibers were bonded to each other.

[Comparative Example 1]
A polypropylene spunbonded nonwoven fabric having a basis weight of 15 g / m ² and a fineness of ² dtex (trade name: ELTAS, manufactured by Asahi Kasei Corporation) was bonded to the hydroentangled nonwoven fabric of Example 1 to form a wiper having a spunbonded surface wiped off.

In the wipers of the above Examples and Comparative Examples, when the melt blown nonwoven fabric surface was used as the nonwoven fabric surface and the tensile force (T) was measured, Examples 1 and 2 showed 4.6N, and the nonwoven fabric surface was rough and hard. Met. On the other hand, Comparative Example 1 was 3.7 N, and the hardness of the nonwoven fabric surface was not sufficient.

(4) The wipers obtained in Example 1 and Example 2 were soaked in water, and the inside of a microwave oven used at home was wiped off. Fine oil stains could be easily wiped off. In addition, when a household detergent was added and the area around the gas range was wiped, sticky oil stains could be wiped off. On the other hand, with the nonwoven fabric of Comparative Example 1, dirt from the microwave oven and the gas range could not be sufficiently wiped.

(4) The wiper obtained in Example 3 was lathered with soap and rubbed against the skin of a human body, whereby dirt such as dirt could be wiped off. When the wiper of Example 3 was lightly moistened to rub the skin of a human body, old dead skin and the like could be wiped off.

[Example 4]
As a hydrophilic nonwoven fabric, 40% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., fiber length: 40 mm, fineness: 1.7 dtex), polyethylene terephthalate fiber (manufactured by Teijin Limited, TT04B, fiber length: 51 mm, fineness: 2.2 dtex) ), And 30% by mass of heat-adhesive conjugate fiber (manufactured by Daiwa Spinning Co., Ltd., NBF (H), fiber length 51 mm, fineness 1.7 dtex) having polypropylene as a core component and high-density polyethylene as a sheath component. The mixture was prepared at a mixing ratio of mass%, and a card web having a basis weight of 60 g / m ² was prepared. Next, the card web was placed on a plain woven net having a wire diameter of 0.5 mm and a mesh number of 17, and subjected to high-pressure hydroentanglement at a water pressure of 8 MPa and a nozzle interval of 1 mm to obtain a hydroentangled open nonwoven fabric having a basis weight of 60 g / m ^2. Was. The obtained hydroentangled nonwoven fabric had a large number of holes having a length in at least one direction of about 1 to 2 mm.

Next, the hydroentangled nonwoven fabric was placed on a belt conveyor of a meltblowing nonwoven fabric manufacturing machine and operated at a speed of 4.4 m / min, and from above, polybutene-1 (trade name, manufactured by Mitsui Chemicals, Inc.) Taffmer, melting point 123 ° C., MFR 28 g / 10 min, density 0.92 g / cm ³ ) as a sheath component, and a sheath-core type composite fiber having a melting point of 163 ° C. as a core component and a spinning nozzle having a discharge hole interval of 0.1 mm. Melt blow spinning from a spinning nozzle arranged at 8 mm at a spinning temperature of 290 ° C., an air flow rate of 8.8 m ³ / min, an air speed of 156 m / sec, a discharge rate of 0.2 g / hole / min, and a distance of 17 cm between the spinning nozzle and the conveyor. and, to obtain by integrating meltblown web while softened molten on hydroentangled apertured nonwoven bonded to the interlayer laminated meltblown nonwoven wiper of the present invention having a basis weight of 120 g / m ² Was none. The thickness of the wiper of the present invention at a load of 2.94 cN / cm ² was 1.55 mm. The thickness under a load of 2.94 cN / cm ² was measured as follows.

[Thickness]
Using a thickness measuring device (manufactured by Mitutoyo Corporation, trade name: ABSOLUTE ID-C1012C), measurement was performed at five places under a load of 2.94 cN / cm ² , and the average value was obtained.

The wiper could not easily peel off the melt blown web and the hydroentangled nonwoven fabric due to the melting of the polybutene-1 resin. The melt blown web is rough and uneven, and when viewed with an electron microscope at a magnification of 40 times, it is in a fiber state as shown in FIG. 1, and about 2 to 5 adjacent melt blown single fibers are bundled and the fiber length is increased. There were nine connecting fibers per square having a length of 3 mm or more in the longitudinal direction and forming connecting portions bonded to each other over a length of 3 mm. The average fiber diameter of the melt blown single fibers was about 17 μm. Further, it had a nonwoven fabric cross section as shown in FIG. 2, and the fibers constituting the melt blown web including the connecting fibers were bonded to each other.

[Comparative Example 2]
100% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., fiber length: 40 mm, fineness: 1.7 dtex) is prepared as a hydrophilic nonwoven fabric, and a card web having a basis weight of 60 g / m ² is subjected to high-pressure hydroentanglement with a water pressure of 8 MPa and a nozzle interval of 1 mm. This was treated to produce a hydroentangled open nonwoven fabric having a basis weight of 60 g / m ² . On the other hand, a thermoadhesive conjugate fiber (manufactured by Daiwa Spinning Co., Ltd., NBF (H), fiber length 51 mm, fineness 1.7 dtex) having polypropylene as a core component and high-density polyethylene as a sheath component was prepared at 100% by mass, A card web having a basis weight of 40 g / m ² was heat-treated with a hot air processing machine (wind speed 2 m / sec, 140 ° C., conveyor speed 10 m / min) to produce a thermally bonded nonwoven fabric having a basis weight of 40 g / m ² .

Then laminating the hydrophilic nonwoven fabric and thermal bond nonwoven fabric, heat roll processing machine (temperature 140 ° C., speed 4m / min, linear pressure 0.7 kg / cm) bonded to a heat treatment at, for basis weight 100 g / m ² A non-woven fabric was obtained.

Soap water (mixed) of water and liquid soap (Super Mild Body Soap NE (C), manufactured by FT Shiseido Co., Ltd., active ingredient 40%) as a cleaning agent and the nonwoven fabric of Example 4 and Comparative Example 2 Ratio 1: 1) was impregnated so as to be 200% by mass based on the mass of the nonwoven fabric. Then, the lathering property and the feel in a wet (wet) state were evaluated as follows.

[Bubbling property]
The state of generation of foam when the wet wiper impregnated with the soap water was lightly rubbed several times by hand was evaluated according to the following criteria.
：: The foam is large and large, and the foam increases each time the nonwoven fabric is rubbed.
Δ: The foam has a certain size, but the increase in the foam is small even when the nonwoven fabric is rubbed.
X: The bubbles are small and small, and the bubbles hardly increase even when the nonwoven fabric is rubbed.

[Tactile sensation in wet state]
The tactile sensation of the wet wiper impregnated with the soap water was evaluated according to the following criteria.
：: Simultaneous feel and voluminous feeling are satisfied at the same time.
Δ: One of the above feelings is missing.
X: Both of the above feelings are lacking.

ワ イ Since the wiper of Example 4 was excellent in foaming property and tactile sensation, it was possible to wipe off dirt on the skin without irritating the skin even if the skin of the human body was lightly rubbed. On the other hand, the wiper of Comparative Example 2 was inferior in wiping off stains on the skin because of less foaming.

The present invention relates to a wiper capable of wiping and polishing dirt stuck to glass, metal, plastic, tile, ceramics, and the like, a wiper, a polishing cloth, a filter, and a shoe that can be used for wiping a human body such as skin keratin and stuck dirt. It is useful for non-slip materials such as insoles, mouse pads, carpets, and foot wipe mats.

It is an enlarged view showing the surface of the melt blown nonwoven fabric of the present invention. It is an enlarged view showing a section of lamination melt blown nonwoven fabric of the present invention. It is the schematic which shows the method of measuring the wiping effect of the dirt in the wiper of this invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Melt blown web 2 Melt blow single fiber 3 Connecting fiber 4 Connecting part 5 Hydrophilic nonwoven fabric 6 Horizontal base 7 Mat 8 Wiper 9 Weight 10 Pull string 11 Measuring device

Claims (13)

(4) A melt-blown nonwoven fabric comprising, in a melt-blown web, a plurality of adjacent melt-blown single fibers bundled together, and connection fibers in which at least a portion in the fiber length direction forms a connection portion bonded to each other. The melt-blown nonwoven fabric according to claim 1, wherein the connection portion of the connection fiber extends over 1 mm or more in the fiber length direction. 3. The melt-blown nonwoven fabric according to claim 1, wherein the connecting fibers are bonded to fibers constituting the melt-blown web. The melt-blown nonwoven fabric according to any one of claims 1 to 3, wherein the melt-blown single fiber is a composite fiber composed of a low-melting resin and a high-melting resin having a melting point higher by 10 ° C or more than the low-melting resin. A laminated melt-blown nonwoven fabric comprising the melt-blown web according to any one of claims 1 to 4 laminated with another fiber aggregate, and the melt-blown web constituting at least one surface. The laminated melt-blown nonwoven fabric according to claim 5, wherein the fibers constituting the melt-blown web and the fibers constituting another fiber aggregate are joined. 7. The laminated melt-blown nonwoven fabric according to claim 6, wherein the fibers constituting the melt-blown web and the fibers constituting another fiber aggregate are joined by softening or melting the fibers constituting the melt-blown web. The laminated melt-blown nonwoven fabric according to any one of claims 5 to 7, wherein the other fiber aggregate is a hydrophilic fiber aggregate containing 30% by mass or more of hydrophilic fibers. The laminated melt blown nonwoven fabric according to any one of claims 5 to 8, wherein the other fiber aggregate is a hydroentangled nonwoven fabric. 積 層 The laminated melt-blown nonwoven fabric according to any one of claims 5 to 9, wherein the other fiber aggregate is an open nonwoven fabric including holes having a length in at least one direction in a range of 1 mm or more and 3 mm or less. A wiper comprising the melt blown nonwoven fabric according to any one of claims 1 to 4, or the laminated meltblown nonwoven fabric according to any one of claims 5 to 10, wherein the surface of the meltblown web constitutes a wiping surface. The wiper according to claim 11, wherein the tensile force (T) on the surface of the nonwoven fabric measured by the following evaluation method is 4N or more.
[Non-woven fabric surface tension]
A sample having a width of 10 cm and a length of 10 cm is placed on a mat (manufactured by KOKUYO Co., Ltd., product number M-268N) so that the melt blown web surface becomes a mat surface, and the sample is weighed 900 g. When a sample is pulled horizontally with a load of 29.25 cm ² (6.5 cm in length, 4.5 cm in width) on the bottom area, the force T (N) when the sample starts to move is measured. A cleaning wiper obtained by applying a detergent to the melt blown nonwoven fabric according to any one of claims 1 to 4, or the laminated meltblown nonwoven fabric according to any one of claims 5 to 10.

Images