JP4158499B2 - Nonwoven fabric and wiping material using the same - Google Patents

Description

【００６１】
【表２】

【００６２】
【発明の効果】
本発明の不織布は、分割型複合長繊維トウからなるため、分割細繊化することにより表面積が大きくなり、かつ分割細繊化した繊維の自由度が大きいため、髪の毛等の比較的大きなゴミから小さなゴミまで払拭性に優れ、ワイピング材に好適に使用することができる。
【図面の簡単な説明】
【図１】本発明で使用する分割型複合繊維の断面の１模式図である。
【図２】本発明で使用する分割型複合繊維の断面の１模式図である。
【図３】本発明で使用する分割型複合繊維の断面の１模式図である。
【図４】本発明で使用する分割型複合繊維の断面の１模式図である。
【図５】本発明で使用する分割型複合繊維の断面の１模式図である。
【図６】本発明で使用する分割型複合繊維の断面の１模式図である。
【図７】本発明で使用する分割型複合繊維の断面の１模式図である。
【符号の説明】
１：中空部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-woven fabric using split composite long fiber tows. More specifically, the present invention relates to a nonwoven fabric that can be suitably used as a wiping material.
[0002]
[Prior art]
Synthetic fiber tows are processed into sticks or non-woven fabrics, and are used for felt pen (trade name “magic ink”) ink tank fillings, cigarette filters, and wiping materials. As a processed non-woven fabric of tow made of split composite fibers, known is a non-woven fabric in which ultra fine fibers are entangled by hydroentangling tow made of split composite fibers. (For example, refer to Patent Document 1) However, in this nonwoven fabric, the fibers are entangled in three dimensions, the high orientation of the fibers, which is a characteristic of the tow, cannot be used, and the degree of freedom of the fibers themselves is limited. When used in a conventional staple fiber, it is not different from a non-woven fabric obtained by dividing and finely dividing, and since the degree of freedom of the fiber is particularly limited, relatively large dust and hair can be reliably captured. It was difficult and was not suitable as a wiping material.
[0003]
[Patent Document 1]
Japanese Laid-Open Patent Publication No. 4-65567 (first page “Claims”, third page “Example”)
[0004]
[Problems to be solved by the invention]
The subject of this invention is providing the nonwoven fabric which can capture | acquire from a comparatively big garbage to a small garbage, and a wiping material using the same.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventor consists of split-type composite long fiber tows having crimps having a single yarn fineness of 0.5 to 20 dtex and a total fineness of 10,000 to 300,000 dtex. A non-woven fabric, in which the fibers constituting the non-woven fabric are not three-dimensionally entangled or slightly entangled, and at least one portion of the fibers is thermally bonded to each other, and the division is less than 0.5 dtex. Knowing that the above-mentioned problems can be solved by using a non-woven fabric containing at least 5% of the finely divided fibers, the present invention has been completed based on these findings.
[0006]
The present invention has the following configuration.
(1) A nonwoven fabric composed of split-type composite continuous fiber tows having crimps having a single yarn fineness of 0.5 to 20 dtex and a total fineness of 10,000 to 300,000 dtex, wherein the fibers constituting the nonwoven fabric are tertiary. The number of crimps of the split-type composite continuous fiber is 3 to 30/25 mm, and the nonwoven fabric has a fiber entanglement degree of less than 30. And at least one part of the fibers are thermally bonded to each other, and the divided finely divided fibers of less than 0.5 dtex are included in a dividing ratio of at least 5%.A non-woven fabric characterized in that the splitting rate of split composite long fiber tow obtained by the following measurement method is less than 50%.
Measuring method of division ratio: A nonwoven fabric is included in wax and sliced at right angles to the fiber axis with a microtome to prepare a sample piece. This is observed with a microscope, and the cross-sectional image of the fiber is image-processed so that the total area (A) of the partially divided fibers and the total breakage of the undivided fibers among the severable segments of the split-type composite fiber The area (B) is measured and calculated by the following formula.
Division rate (%) = {A / (A + B)} × 100
[0008]
(2) The non-woven fabric split-type composite continuous fiber tow is the non-woven fabric described in the above item (1), which is opened and arranged in the fiber axis direction.
[0009]
(3) Items (1) to (2A wiping material using the nonwoven fabric according to any one of items 1).
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The tow constituting the nonwoven fabric of the present invention comprises split-type composite long fibers made of a thermoplastic resin, the fibers have crimps, and the total fineness is 10,000 to 300,000 dtex. The undivided single yarn fineness is 0.5 to 20 dtex. The thermoplastic resin forming the fiber used in the tow of the present invention is not particularly limited as long as it has fiber formability in the melt spinning process. For example, polypropylene, low-density polyethylene, high-density polyethylene, linear low-density polyethylene, propylene-ethylene copolymer, propylene-ethylene-butene-1 copolymer, two- to three-component co-polymerization of propylene and other α-olefins. Polyolefin resins polymerized using Ziegler-Natta catalysts such as polymers and metallocene catalysts, polyethylene terephthalate, polybutylene terephthalate, low-melting point polyesters copolymerized with isophthalic acid in addition to terephthalic acid as the acid component, etc. Polyester resins such as nylon-6 and nylon-66, polystyrene resins such as atactic polystyrene and syndiotactic polystyrene, elastomeric resins such as polyurethane elastomer and polyester elastomer, Examples include biodegradable resins such as lactic acid, polybutylene succinate, polybutylene succinate adipate, polybutylene succinate terephthalate, polybutylene terephthalate adipate, fluorine resins such as polyvinylidene fluoride, resins such as polyphenylene sulfide and polyketone. . Examples of the thermoplastic resin other than those mentioned above include, for example, vinyl polymers. Specifically, ethylene vinyl alcohol copolymer, polyvinyl acetate, polyacrylic acid ester, ethylene vinyl acetate copolymer, ethylene anhydride maleate. Acid graft copolymers can also be used.
[0011]
The thermoplastic resin used in the present invention further includes an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizer, a nucleating agent, an epoxy stabilizer, a lubricant, an antibacterial agent within the range not impeding the effects of the present invention. Additives such as an agent, a flame retardant, an antistatic agent, a pigment, and a plasticizer may be added as necessary.
[0012]
The tow constituting the nonwoven fabric of the present invention is composed of split-type composite long fibers, and the cross-sectional structure of the split-type composite long fibers has, for example, a cross-sectional structure in which two different components of the thermoplastic resin are alternately arranged. The structure illustrated to 1-7 can be mentioned. For example, as illustrated in FIG. 1 and FIG. 2, a radial division type cross section in which each component is arranged alternately, as shown in FIGS. 3 and 4, a hollow division type cross section in which each component is arranged alternately, FIG. 5 and FIG. 6 illustrates a layered divided cross section in which the components are alternately arranged in layers, and FIG. 7 illustrates a divided cross section in which the components are alternately arranged to make the fiber cross section bent, curved, or flat. can do. Of course, in the split-type composite continuous fiber composed of multi-component resin, a cross-sectional structure in which multi-components are arranged without forming the same components adjacent to each other is formed. The cross-sectional structure and shape of the conjugate fiber illustrated in FIGS. 1 to 7 are model diagrams. During actual fiber production, the conjugate fiber may be subjected to various external stresses and the sectional shape may be deformed. There is no particular problem.
[0013]
The combination of the resin of the split-type composite long fiber can be any combination of the thermoplastic resins, but polyester resin / polyamide resin, polyamide resin / polyolefin resin, polyester resin / polyolefin resin, Examples of polyolefin resins / polyolefin resins include polyethylene terephthalate resin / nylon 66 resin and polyethylene terephthalate resin / polypropylene resin when used under high temperature conditions. In the required field, a combination of polypropylene resin / polyethylene resin is exemplified, and when heat sealability is required, the difference in melting point between the two resin components to be combined is better. For example, polyethylene terephthalate resin / polyethylene resin Etc. It can be shown. In the split-type composite long fiber, the composite ratio of the composite fiber composed of the two-component thermoplastic resin is in the range of 10/90 to 90/10, more preferably 30/70 to 70/30, by volume ratio. is there.
[0014]
If the single yarn fineness before splitting of the split composite long fibers is too thin, the spinnability in the melt spinning process tends to be lowered. From this viewpoint, a single yarn fineness of 0.5 dtex or more is preferable, and 1 dtex is more preferable. On the other hand, if the single yarn fineness is too thick, the convergence of the obtained tow is lowered and the productivity is lowered. From this viewpoint, a single yarn fineness of 20 dtex or less is preferable, and 10 dtex is more preferable.
[0015]
The total fineness of the tow constituting the nonwoven fabric of the present invention is too large or too small, the tow convergence is not obtained, the tow is broken finely, the single yarn is excessively entangled, the spread Opening in the process becomes difficult. From this viewpoint, the total fineness of the tow is preferably 10,000 dtex or more, more preferably 50,000 dtex or more. Similarly, 300,000 dtex or less is preferable, and 200,000 dtex or less is more preferable.
[0016]
If the density of the tow is too small, the convergence of the tow is liable to be lost. In this respect, the tow density is preferably 1000 dtex / mm or more, and more preferably 1500 dtex / mm or more. Moreover, when the density of a tow | toe is too high, it exists in the tendency for it to become difficult to provide a crimp uniformly, and the fiber opening in a fiber opening process becomes difficult. In this respect, the tow density is preferably 8000 dtex / mm or less, and more preferably 5000 dtex / mm or less.
[0017]
The tow has a crimp, and this crimp may be an actual crimp or a latent crimp, and the crimped shape is a zigzag-shaped, U-shaped or spiral-shaped tow in a mountain valley shape. Either may be sufficient. The crimping method includes a method using a stuffer box type crimper, a method using gas intrusion using high-temperature high-pressure steam or heated pressurized air, and a tow between a pair of high-speed rotating bodies such as a high-speed crimper. And a method of imparting crimps.
[0018]
If the number of crimps of the fibers constituting the tow is too small, the convergence of the tow becomes worse. From this viewpoint, it is preferable that the fibers constituting the tow have a number of crimps of 3 peaks / 25 mm or more, more preferably 4 mountains / 25 mm or more, and even more preferably 5 mountains / 25 mm or more. On the other hand, if the number of crimps is too large, the fibers are entangled excessively and the tow opening performance is reduced. From this point of view, the fibers constituting the tow preferably have a number of crimps of 30 peaks / 25 mm or less, more preferably 25 peaks / 25 mm or less, and even more preferably 20 peaks / 25 mm or less.
[0019]
In the tow constituting the nonwoven fabric of the present invention, split composite long fibers and another fiber made of one or more kinds of the thermoplastic resins may be used together (mixed cotton, mixed fiber). The kind of the fiber made of the thermoplastic resin to be blended is not particularly limited, and examples thereof include a component single type fiber and a composite type fiber. When blended as an adhesive or welding component, it is a fiber containing the same type of resin as the thermoplastic resin constituting the split composite long fiber in order to bond the split composite fiber to form a nonwoven fabric. preferable. Further, when the mixed cotton fiber is melted by heat treatment and bonded, the component of the split-type composite long fiber is obtained by using, as an adhesive component, a resin that melts at a temperature lower than the low melting point resin of the split-type composite long fiber. The nonwoven fabric can be formed without melting the resin, and the division and finening can be facilitated. Furthermore, the strength of the nonwoven fabric can be further increased by using composite fibers as adhesive fibers. The cross-sectional shape of the fiber may be circular, irregular, hollow or solid, and the cross-sectional shape of the composite fiber (composite fiber) is a sheath core type, an eccentric sheath core type, a parallel type, Any of a multilayer type, a sea-island type, a radial type, a hollow radial type, and the like may be used. The higher the splitting rate of the split type composite long fiber tow, the better the performance improvement of the wiping material, but considering the workability in the opening process, the splitting rate of the tow determined according to the splitting rate measurement method below is Preferably it is less than 50%.
[0020]
If you want to impart hydrophilicity to the nonwoven fabric or if you want to impregnate a hydrophilic drug, you may mix hydrophilic fibers, knead the hydrophilic agent into the resin, or show hydrophilicity Application of a surfactant to the fiber surface can also be used. Here, the hydrophilic fiber is not limited as long as it is a fiber exhibiting hydrophilicity. For example, regenerated fibers such as rayon and cuvula, semi-synthetic fibers such as acetate and triacetate, synthetic fibers such as polyamide and acrylic, cotton Natural fibers such as wool and hemp.
[0021]
The hydrophilizing agent is not particularly limited as long as it can impart hydrophilicity even when kneaded into a hydrophobic resin such as a polyolefin resin. For example, alkyl sulfonate Na salt, fluorine Examples of the surfactant include fatty acid glycerides, alkoxylated alkylphenols, polyoxyalkylene fatty acid esters, fatty acid amides, and ethers of ethylene glycol. In this case, the surfactant may be a single component or a mixture of a plurality of components.
[0022]
In the nonwoven fabric of the present invention, the tow is further opened with a tow opening machine or the like to form a web, and at least one part of the fibers is thermally bonded to each other, so that the degree of freedom of the individual fibers is increased while maintaining the shape of the nonwoven fabric. It is possible to maintain and highly develop wiping properties when used as a wiping material.
[0023]
Here, thermal bonding refers to a state in which a part of the low melting point component of the fibers constituting the web is melted by heating, and this is used as an adhesive to bond the fibers. Conventionally known methods can be used for the thermal bonding, and examples thereof include a hot air circulation method (through air method), a point bond method, a calendar method, and a heat seal method.
[0024]
The non-woven fabric of the present invention has a small amount even if the split composite long fibers and split fine fibers are not three-dimensionally entangled or three-dimensionally entangled, and substantially three-dimensionally entangled. It is important that the fibers are thermally bonded to each other. When the fibers are three-dimensionally entangled like a normal spunlace nonwoven fabric consisting of short fibers, the nonwoven fabric is excellent in strength and form stability, but on the other hand, the degree of freedom of the fiber is low and it is used as a wiping material. It is difficult to efficiently scrape from large garbage to small garbage. Therefore, the form stability of the nonwoven fabric and the strength of the nonwoven fabric are ensured by thermal bonding between the fibers. Here, the three-dimensional entanglement refers to a state in which the fibers are tightly entangled with each other by needles, stitches, high-pressure air flow, high-pressure water flow, etc., and the shape of the nonwoven fabric is maintained only by such entanglement. It refers to what can be done.
[0025]
More specifically, the degree of three-dimensional entanglement can be determined from the degree of entanglement of the nonwoven fabric. If the three-dimensional entanglement of the fibers is strong (the degree of entanglement is high), fine dust can be wiped off, but it is difficult to reliably wipe off relatively large dust. The degree of entanglement in this case is a value measured by the following evaluation method. Conventionally, the three-dimensional entanglement of a nonwoven fabric could be observed visually or with a microscope, but it was difficult to show this as a quantitative value. However, since it was found that the value measured by this method has a clear correlation with the degree of three-dimensional entanglement of the nonwoven fabric, this value is used as the degree of entanglement in the present invention. In the case of the present invention, this value is preferably less than 30, more preferably less than 20, and most preferably less than 15.
Fiber entanglement of the nonwoven fabric: The nonwoven fabric was fixed to a Frazier-type air permeability tester, and a push-pull gauge equipped with a 2 mm diameter steel rod perpendicular to the nonwoven fabric was lowered at a speed (3 mm / second) to penetrate the nonwoven fabric. Measure the puncture strength at the time. The degree of confounding is calculated from the following formula. Furthermore, the degree of entanglement of the fiber was judged by the following judgment.
Degree of entanglement = {puncture strength (N) / non-woven fabric basis weight (g / m²)} × 100
[0026]
The splitting and finening method of the split-type composite long fibers constituting the nonwoven fabric of the present invention is not particularly limited, but for example, the crimp edge portion may be partially split due to the stress at the time of crimping, After dividing the fiber by a mild water treatment, crimping may be applied to form a tow. Moreover, a tow | toe or a nonwoven fabric can be pinched | interposed with two rolls, a stress can be added and it can also make it partly fine. Examples of the combination of rolls include a metal roll and a metal roll, a metal roll and a rubber roll, and a rubber roll and a rubber roll. Further, the roll surface may be flat or uneven. Examples of the concavo-convex shape include those having convex portions such as straight lines or wavy lines orthogonal to the roll rotation direction. Preferred among these rolls are a combination of metal rolls whose surfaces are flat and a combination of metal rolls where one is a flat surface and the other is an uneven surface.
[0027]
The fineness of the fibers obtained by dividing and finening the split composite long fibers is preferably less than 0.5 dtex, more preferably less than 0.3 dtex. If the fineness after splitting is fine, the number of fibers constituting the same basis will increase, and this will work favorably for collecting dust. The number of divided segments of the split-type composite long fibers may be determined so that the average fineness of the ultrafine fibers obtained by split-finening is less than 0.5 dtex. Although there is an advantage that the fineness afterwards becomes small, it is actually preferable to set the number of segments to 4 to 32 for ease of fiber production. In addition, the fineness of the individual segments does not need to be the same, and when the split-type composite long fibers are not completely divided to fineness, the undivided split-type composite long fibers and the completely divided ultrafine fibers A plurality of fibers having different finenesses may be mixed in the middle. In the present invention, it is necessary that the finely divided fibers of less than 0.5 dtex are contained in a division ratio of at least 5%. This affects the collection efficiency of dust when used as a wiping material. In particular, when used for cleaning to clean fine parts and unevenness, the nonwoven fabric of the present invention is preferably used, but the division further proceeds due to the stress applied when scraping off the dirt, and the division is increased as the dirt is scraped off. As a result, the scraping performance is further improved.
[0028]
In the present invention, for example, when the opened web-like material at the previous stage for producing a tow, nonwoven fabric or nonwoven fabric by hydroentangling is divided into fine fibers, it is necessary to suppress the three-dimensional entanglement of the fibers as much as possible. For that purpose, it is important to apply tension to the fiber. For example, in the case of tow, a mild water flow treatment is performed with tension applied to the fibers. In the case of a non-woven fabric, mild water flow treatment is performed after sufficiently bonding the fibers by thermal bonding in advance. Furthermore, even in the case of a web-like product that has been opened, by applying tension to the fibers, even if the fibers are not entangled or entangled, there is little, and it is possible to reduce the three-dimensional entanglement and to make divided fine fibers Become.
[0029]
When the nonwoven fabric of the present invention is used as a wiping material, it is particularly desirable that the split composite long fiber tows are opened and arranged in the fiber axis direction. At the start of cleaning, the ratio of the finely divided fibers is small, and the degree of freedom of the fibers is large, so that it is excellent for capturing relatively large dust. In addition, while using as a wiping material, the cleaning surface such as the floor and walls and the fiber axis direction work perpendicularly, so the physical stress that rubs up causes the splitting to become finer and the proportion of ultrafine fibers gradually increases. come. Thus, since the fineness of the fiber comprised with time changes, after collecting large dust, it is possible to scrape even smaller dust as the fineness becomes thinner. On the other hand, in the nonwoven fabric in which the division into ultrafine fibers has progressed too much from the beginning, it is difficult to capture relatively large dust, although fine dust can be captured. Furthermore, in the case of a non-woven fabric composed of tow, the fibers are continuous, so that even if the raising treatment is performed, the fibers are not dropped off from the non-woven fabric, and can be suitably used as a wiping material.
[0030]
The nonwoven fabric of the present invention is obtained by laminating a nonwoven fabric or a web-like material composed of other hydrophilic or water-repellent short fibers or long fibers on the tow and the tow-opened web. You can also Lamination may be performed either in the fiber axis direction of the opened tow or in the cross direction. If the fiber is a long fiber, a long fiber web obtained by a spunbond method, a tow opening method, a melt blown method, etc., and if it is a short fiber, a web is created by a method such as carding, air laying, wet lamination, It can be made into a nonwoven fabric by bonding the fiber intersections by heat treatment. The nonwoven fabric of the present invention may be laminated with other fabrics (woven fabrics, knitted fabrics).
[0031]
As an example of a method for producing a split composite long fiber constituting the nonwoven fabric of the present invention, a method for producing a split composite long fiber in which two components of a polypropylene resin and a high density polyethylene resin are combined will be exemplified.
The two components are spun as long fibers by a normal melt spinning machine. In spinning, it is preferable to spin at a spinning temperature in the range of 180 to 300 ° C., and the take-up speed is preferably about 40 m / min to 1500 m / min. Stretching may be performed by multistage stretching as necessary, and the stretching ratio is usually about 3 to 9 times. Further, the obtained tow may be crimped as necessary. Splitting and thinning of the split type composite fiber can be performed by applying a physical stress to the tow at an arbitrary position in the process. In addition, by dividing the tow again into a metal roll or the like at a high pressure after collecting the tow, it is possible to apply physical stress to perform divided finening.
[0032]
In such a process, after spinning the fiber, a surfactant or a kneading hydrophilizing agent is used for the purpose of preventing static electricity of the fiber, improving processability to the fiber molded body, imparting smoothness, imparting hydrophilicity, etc. Can do. The type and concentration of the surfactant are appropriately adjusted according to the application. As a method of attachment, a roller method, a dipping method, or the like can be used. The attachment may be performed in any of a spinning process, a drawing process, and a crimping process. Furthermore, a surfactant can be attached after forming on a fiber molded body, for example, other than the spinning step, the drawing step, and the crimping step.
[0033]
Next, an example of the nonwoven fabric manufacturing method of this invention is shown. Using the split type composite fiber tow, it is made into a web shape using a pinch roll type fiber spreader or the like, and heat-treated at a temperature at which the low melting point resin constituting the fiber melts to produce a nonwoven fabric. At this time, the resin powder that melts at a lower melting point than the fibers constituting the web is mixed with the web in advance, and after sliver, heat treated in a cylindrical container at a temperature at which the powder melts, and then taken out and molded into a nonwoven fabric You can also Furthermore, division | fine-fibering can be performed by making physical stress, such as a high-pressure water flow process, a metal roll, and a scraper, act on a nonwoven fabric in the arbitrary places in a nonwoven fabric processing process.
[0034]
Furthermore, a further additional function can be imparted to the split-type composite continuous fibers by attaching or including a functional agent to the nonwoven fabric of the present invention. A conventionally well-known thing can be used as a functional agent. For example, an antibacterial deodorant, a deodorant, a liquid paraffin etc. can be illustrated. For example, when the functional agent is a solution, it may be used by impregnating the porous substrate, or may be applied directly. Examples of the porous substrate include allophane, imogolite, artificial zeolite, natural zeolite, synthetic zeolite, activated carbon and the like.
[0035]
Antibacterial, deodorant and antifungal agents include inorganic antibacterial agents typified by silver, copper and zinc, benzalkonium chloride, organic silicon quaternary ammonium salts, polyhexamethylene biguanidine hydrochloride and chlorhexidine gluconate Examples thereof include natural antibacterial agents such as chitin chitosan, polylysine, hiba oil, eucalyptus, catechin, and aloe. Examples of the deodorant include betaine double-sided activator, carbonyl compound, photocatalyst represented by titanium dioxide, activated carbon, zeolite, catechin, inorganic deodorant, copper-phthalocyanine, iron-phthalocyanine, metal ion and the like.
[0036]
Since the tow and nonwoven fabric of the present invention are composed of split-type composite long fiber tows, the number of fibers can be increased, and the fibers are not entangled or entangled. Can be wiped from large dust to small dust, and even an oil film, and can be suitably used as a wiping material.
[0037]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention, this invention is not limited by these. The terms and methods for measuring physical properties in Examples and Comparative Examples are as follows.
[0038]
(A) Melting point:
Measurement was performed in accordance with JIS K 7122 using a thermal analyzer DSC Q10 manufactured by TA Instruments.
[0039]
(B) Melt flow rate (MFR): measured in accordance with JIS K 7210.
Raw material polypropylene resin: Condition 14 of JIS Table 1
Raw material polyethylene resin: Condition 4 in JIS Table 1
[0040]
(C) Density: A density gradient tube was used in accordance with JIS K 6760.
[0041]
(D) Intrinsic viscosity of polyethylene terephthalate: It was measured at a concentration of 0.5 g / 100 ml and a temperature of 20 ° C. using an equal weight mixed solvent of phenol and ethane tetrachloride.
[0042]
(E) Division ratio: A nonwoven fabric is included in wax, and sliced at right angles to the fiber axis with a microtome to prepare a sample piece. This is observed with a microscope, and the cross-sectional image of the fiber is image-processed so that the total area (A) of the partially divided fibers and the total breakage of the undivided fibers among the severable segments of the split-type composite fiber The area (B) was measured and calculated by the following formula.
Division rate (%) = {A / (A + B)} × 100
[0043]
(F) Wiping performance: Evaluation of wiping performance when actually wiped by a monitor of five people. Samples prepared by cutting the nonwoven fabric obtained in each example into 20 cm × 20 cm squares, those containing moisture, and those having oil attached thereto are prepared. A 10 cm long hair and 1 g of JIS Z 8901 type 7 test dust are uniformly spread over a 30 cm × 30 cm square area of a square flooring board (50 cm × 50 cm) and wiped off with the prepared sample. There are five levels of wiping on the flooring: Excellent, Good, Normal, Slightly Bad, and Defective, and this is compared with each monitor's point of view. Evaluation was expressed as an average value. The larger the value, the better, and a score of 3 or more was accepted. The moisture was 150% by weight with respect to the weight of the nonwoven fabric, and 63 mPa · s of mineral oil (liquid paraffin) was used for the oily material, and the adhesion amount was 6% by weight.
[0044]
(G) Spreading coefficient: The value obtained by dividing the tow width when the tow was stretched and opened with a pinch roll type spreader at a speed of 60 m / min and a magnification of 1.5 times by the tow width before the opening process. The fiber coefficient was used. A tow having an opening coefficient in the range of 3 to 25 has good opening property. When the spread coefficient is less than 3, the uniform spreadability in high-speed production is inferior. On the other hand, when the spread coefficient exceeds 25, tow cracking occurs in the process of performing the spread process with a spreader.
[0045]
(H) Tow convergence: The state and location of tow cracking per 1 m of tow length were observed. Judgment criteria were good when 0 to 1 parts were tow cracked and completely separated, and poor when there were 2 or more parts.
[0046]
(I) Number of crimps: Measured according to the method of JIS L 1015 (unit: mountain / 25 mm).
[0047]
(J) Fiber entanglement degree of the nonwoven fabric: The nonwoven fabric is fixed to a Frazier-type air permeability tester (Toyo Seiki, inner diameter of material fixing table: 70 mm). Push-pull gauge (Imada Co., Ltd., Mechanical Force Gauge, PS-50N, equipped with an iron rod with a diameter of 2 mm) is lowered at a speed (3 mm / second) vertically to the nonwoven fabric, and the puncture strength when penetrating the nonwoven fabric Measure. The degree of confounding is calculated from the following formula. Furthermore, the entanglement degree of the fiber was judged by the following judgment.
Degree of entanglement = {puncture strength (N) / non-woven fabric basis weight (g / m²)} × 100
Less than 30 degree of entanglement: the fiber is not substantially 3D entangled
Entanglement degree 30 or more: The fibers are entangled three-dimensionally
[0048]
Example 1
(Tow production method)
Using polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A and high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, using a split composite fiber die, volume An undrawn yarn having a ratio of 50/50 and a single yarn denier of 15 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 120 ° C. and 5 times to obtain a drawn yarn tow.
(Nonwoven fabric manufacturing method)
The tow is opened by a spreader to form a web, and the similarly opened webs are arranged so as to overlap in parallel with the fiber axis directions of both webs to produce a web having a width of 20 cm. The web was pressed with a metal roll having a smooth surface at a pressure of 100 N / cm, and divided into fine pieces. Further, the welding width is 3 mm in the direction perpendicular to the fiber alignment direction, the processing temperature is 145 ° C., the pressing time is 0.5 sec, and the pressing pressure is 3 kg weight / cm.²And heat sealed. Similarly, heat sealing was performed at intervals of 5 cm to prepare a nonwoven fabric. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0049]
Example 2
(Tow production method)
Polyethylene terephthalate having an intrinsic viscosity of 0.60 (Kanebo Co., Ltd., K101) as component A, high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, volume ratio 50/50, single yarn denier 10 A 5 dtex split composite long fiber was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 120 ° C. and 3.5 times to obtain a drawn yarn tow. The edge of the crimp was divided by the stress applied during crimping.
(Nonwoven fabric manufacturing method)
It produced according to Example 1. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0050]
Example 3
(Tow production method)
Polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A, high-density polyethylene resin (melting point 131 ° C., MFR 26 g / 10 min) and ethylene maleic anhydride graft copolymer (density 0.931 g / cm)³The blend ratio is 0.15 mol / kg, MFR 14 g / 10 min) at a weight ratio of 80/20, and B component is used. Using a split type composite fiber die, the volume ratio is 50/50, and the single yarn denier is 15 dtex. Undrawn yarn was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 5 times to obtain a drawn yarn tow.
(Nonwoven fabric manufacturing method)
It produced according to Example 1. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0051]
Example 4(Reference example)
(Tow production method)
  Using polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A and high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, using a split composite fiber die, volume An undrawn yarn having a ratio of 50/50 and single yarn denier of 90 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn is drawn at 120 ° C and 5 times, and the tension is applied to the drawn yarn between the crimper and the drawing roll (20N per 10,000 dtex). And a drawn yarn tow was obtained.
  The water flow treatment was performed by the following method. A high pressure water flow of 8 MPa is jetted from three rows of nozzles (nozzle diameter 0.1 mm, nozzle pitch 1 mm, 100 holes) arranged at right angles to the direction of travel of the tow, and passed immediately below at a speed of 30 m / min Promoted splitting and finening.
(Nonwoven fabric manufacturing method)
  The tow is opened with a spreader to form a web, and the similarly opened webs are arranged so as to partially overlap to produce a web having a width of 20 cm. Further, the welding width is 3 mm in the direction perpendicular to the fiber alignment direction, the processing temperature is 145 ° C., the pressing time is 0.5 sec, and the pressing pressure is 3 kg weight / cm.²And heat sealed. Similarly, heat sealing was performed at intervals of 5 cm to produce a nonwoven fabric. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0052]
Example 5(Reference example)
(Nonwoven fabric manufacturing method)
  The drawn yarn tow obtained in Example 1 was opened with a spreader to form a web, and the similarly opened webs were arranged so as to overlap in parallel to the fiber axis direction of both webs to produce a web having a width of 20 cm. To do. Furthermore, the processing temperature is 145 ° C., the pressurization time is 0.5 sec, the pressurization is 3 kgf / cm, the width is 1 mm in the direction perpendicular to the fiber alignment direction.²And heat sealed. Similarly, heat sealing was performed at intervals of 2 cm to prepare a nonwoven fabric. In a state where the tow tension (20 N per 10,000 dtex) was applied, a weak water flow treatment was carried out to promote the splitting and finening. The water flow treatment was performed by the following method. It was placed on a conveyor belt made of 100 mesh plain weave, passed through a nozzle having a nozzle diameter of 0.1 mm and a nozzle pitch of 1 mm at a conveyor conveyor net speed of 5 m / min, and a high-pressure water stream was jetted. First, 3 steps of 3 MPa and 4 steps of 5 MPa were processed. Here, the step is the number of times that the nozzle has passed directly under the nozzle. The nonwoven fabric is in a state in which fibers are fixed and tension is applied by heat treatment before the water flow treatment. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0053]
Example 6
(Nonwoven fabric manufacturing method)
The tow produced in Example 1 is opened by a spreader to form a web, and the similarly opened webs are arranged so as to overlap in parallel with the fiber axis direction of both webs to produce a web having a width of 20 cm. The web was pressed with a metal roll having a smooth surface at a pressure of 100 N / cm, and divided into fine pieces. Furthermore, a polypropylene spunbonded nonwoven fabric (fineness: 2.2 dtex, basis weight: 20 g / m)²), A welding width of 3 mm in the direction perpendicular to the fiber alignment direction, a processing temperature of 145 ° C., a pressurization time of 0.5 sec, and a pressurization of 3 kg weight / cm²And heat sealed. Similarly, heat sealing was performed at intervals of 5 cm to prepare a nonwoven fabric. The non-welded portion of the produced non-woven fabric was cut with a pinch, and brushed up was expressed. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0054]
Example 7
(Tow production method)
Polyethylene terephthalate with intrinsic viscosity of 0.60 (manufactured by Kanebo Co., Ltd., K101) is A component, high-density polyethylene resin (melting point: 131 ° C., MFR: 16 g / 10 min), 4 wt% of alkyl sulfonate Na salt with 14 carbon atoms The added component was B component, and a split-type composite long fiber having a volume ratio of 50/50 and a single yarn denier of 10.5 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 120 ° C. and 3.5 times to obtain a drawn yarn tow. The edge of the crimp was divided by the stress applied during crimping.
(Nonwoven fabric manufacturing method)
It produced according to Example 1. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0055]
Comparative Example 1
Using polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A, high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, using a core-sheath composite fiber die, An undrawn yarn having a volume ratio of 50/50 and a single yarn denier of 15 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn 5 times at 120 ° C. to obtain a drawn yarn tow of a sheath-core type composite fiber.
(Nonwoven fabric manufacturing method)
According to Example 1, it produced without carrying out the division | segmentation fine process. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0056]
Comparative Example 2
(Tow production method)
Using polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A and high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, using a split composite fiber die, volume An undrawn yarn having a ratio of 50/50 and a single yarn denier of 10.5 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 3.5 times to obtain a drawn yarn tow.
(Nonwoven fabric manufacturing method)
According to Example 1, it produced without carrying out the division | segmentation fine process. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0057]
Comparative Example 3
Using polypropylene resin (homopolymer, melting point 163 ° C., MFR 16 g / 10 min) as component A and high-density polyethylene resin (melting point 131 ° C., MFR 16 g / 10 min) as component B, using a split composite fiber die, volume An undrawn yarn having a ratio of 50/50 and a single yarn denier of 200 dtex was spun. In the take-off process, an alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 120 ° C. and 8.5 times to obtain a drawn yarn tow.
(Nonwoven fabric manufacturing method)
It produced according to Example 1. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0058]
Comparative Example 4
The tow obtained in Example 1 is opened by a spreader to form a web, and the similarly opened webs are arranged so as to overlap in parallel to the fiber axis direction of both webs to produce a web having a width of 20 cm. Further, it was placed on a conveyor belt made of plain mesh of 80 mesh, passed at a conveyor conveyor net speed of 5 m / min, directly under a nozzle having a nozzle diameter of 0.1 mm and a nozzle pitch of 1 mm, and a high-pressure water stream was jetted. First, 4MPa was processed in 1 step and 4MPa in 4 steps. Similarly, the back surface was treated to prepare a nonwoven fabric in which the fibers were three-dimensionally entangled. The nonwoven fabric was made into a nonwoven fabric without any heat treatment. Hereinafter, evaluation was performed mainly using a wiping material, and the results are shown in Tables 1 and 2.
[0059]
As described above, as can be seen from Examples 1 to 8 and Comparative Examples 1 to 4, the nonwoven fabric of the present invention can efficiently wipe from large dust to small dust when used as a wiping agent.
[0060]
[Table 1]

[0061]
[Table 2]

[0062]
【The invention's effect】
Since the nonwoven fabric of the present invention is composed of split-type composite long fiber tows, the surface area is increased by splitting and finening, and the degree of freedom of the split and fine fibers is large, so that relatively large dust such as hair can be used. It is excellent in wiping even small dust and can be suitably used as a wiping material.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 2 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 3 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 4 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 5 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 6 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
FIG. 7 is a schematic diagram of a cross section of a split type composite fiber used in the present invention.
[Explanation of symbols]
1: Hollow part

Claims (3)

A non-woven fabric composed of split composite long fiber tows having a single yarn fineness of 0.5 to 20 dtex and a total fineness of 10,000 to 300,000 dtex, wherein the fibers constituting the non-woven fabric are three-dimensionally entangled. Or the number of crimps of the split-type composite continuous fiber is 3 to 30/25 mm, the fiber entanglement of the nonwoven fabric is less than 30, and at least 1 The fibers of the parts are thermally bonded to each other, and the split fine fibers less than 0.5 dtex are included in a split ratio of at least 5%, and the split ratio of the split-type composite long fiber tow determined by the following measurement method is 50 Non-woven fabric characterized by being less than%.
Measuring method of division ratio: A nonwoven fabric is included in wax and sliced at right angles to the fiber axis with a microtome to prepare a sample piece. This is observed with a microscope, and the cross-sectional image of the fiber is image-processed so that the total area (A) of the partially divided fibers and the total breakage of the undivided fibers among the severable segments of the split-type composite fiber The area (B) is measured and calculated by the following formula.
Division rate (%) = {A / (A + B)} × 100 The nonwoven fabric according to claim 1, wherein the split-type composite continuous fiber tows of the nonwoven fabric are opened and arranged in the fiber axis direction. Wiping material using the nonwoven fabric according to any one of claims 1 through Section 2 Section.

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