TW201241253A - Sponetaneously crimping conjugate short fiber and manufacturing method thereof, fiber aggregates and sanitary articles - Google Patents

Abstract

To provide a spontaneously crimping conjugate short fiber which is a conjugate short fiber comprising a first component and a second component, wherein the first component comprises linear polyethenylene having density of 0.90 g/cm<SP>3</SP> to 0.94 g/cm<SP>3</SP> and low density polyethylene as ingredients, the second component comprises 50 mass% or more of polyethylene terephthalate and/or polybutylene terephthalate as ingredients, upon the fibers cross-section, those two components are so arranged that the first component occupies at least 20% of the surface of the fiber, and the center of gravitational position of the second component is deviated from the center of gravitational position of the fiber, and therefore, the conjugate short fiber can have at least one kind of crimp selected from wavy crimps and helical crimps.

Description

201241253 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a remarkable crimped composite short fiber excellent in spinnability and processability (especially high-speed carding property), and a surface using the same A fiber assembly having a good touch, a softness in a thick direction, and excellent elasticity, and a sanitary article using the fiber assembly. [Prior Art] Conventionally, a composite fiber composed of two or more kinds of components has been proposed as a composite fiber comprising polyethylene as a main component and having at least a part of the surface of the composite fiber. Such a composite fiber is continuously improved for the purpose of further improving the touch and softness of a fiber-derived product (especially a non-woven fabric) and further improving thermal adhesion by polyethylene. For example, Patent Document 1 (JP-A-2008-264473) proposes a crimped conjugate fiber comprising a first component containing a linear polyethylene polymer polymerized using a metallocene catalyst, The two component is a composite fiber of a polyester containing 50% by mass or more of polytrimethylene terephthalate, wherein the position of the center of gravity of the second component is deviated from the position of the center of gravity of the composite fiber, and the composite fiber has The corrugated and helical crimps select at least one of the crimps. The conjugate fiber proposed in Patent Document 1 is very soft and exhibits an excellent initial volume recovery rate because its second component contains polytrimethylene terephthalate as a main component. Patent Document 2 (JP-A-63-105111) proposes a composite heat-fusible fiber characterized in that a composite system in which two components having different melting points are different, 323879 4 201241253, are arranged concentrically or in parallel. In the thermal adhesive fiber, one of the aforementioned components is composed of a low-melting component of 2 to 20% linear low-density polyethylene or low-density polyethylene added to the high-density polyethylene, and the other component has a low melting point ratio. A resin having a melting point component of 20 ° C or higher and having a fiber forming ability as a high melting point component. The conjugate fiber described in the document has a wide range of welding conditions, and a non-woven fabric having stable swell strength and feel can be obtained even if the production conditions and external air conditions fluctuate. Patent Document 3 (Japanese Laid-Open Patent Publication No. Hei 11-350255) is proposed to have a high melting point and a low melting point, and has a low melting point of at least 5 lower than a high melting point. The core-sheath type composite fiber composed of the sheath portion of the polyethylene resin (A) and the core portion of the high melting point resin (b) having a melting point higher than the highest melting point of the polyethylene resin by 10 ° C or higher Or a side-by-side type composite fiber composed of a polyethylene-based resin portion formed of a polyethylene resin (A) and a high-point resin portion formed by a melting point resin (B). The conjugate fiber described in this document is suitable for a wide processing temperature. Therefore, when the web formed by the fiber is entangled by hot embossing, it can be prevented from being attached to the heat-affinity and the embossing is hot embossing. Excellent sex. Patent Document 4 (Japanese Patent No. 4315663) proposes a method for producing a non-woven fabric, which is characterized in that a polyester and a first polyethylene obtained by a metallocene polymerization catalyst are used by Ziegler-N. The second polyethylene-mixed polyethylene obtained by the Ziegler-Natta polymerization catalyst is supplied to the core (four) composite spinning hole and spun into the core portion, and the poly (four) is disposed on the sheath portion. The core portion is composed of the above (4) and the non-woven fabric sheath portion of the 323879 5 201241253 is composed of the polyacetonitrile, and the cross-sectional shape of the core portion is substantially unchanged in the fiber axis direction, and the thickness of the sheath portion is in the fiber axis direction and the fiber circumferential direction. The core-sheath composite long fibers which are non-uniform and randomly changed, and then the core-sheath composite long fibers are accumulated. According to the production method, it is possible to obtain a long fiber which is excellent in flexibility and is excellent in heat-sealing property because the fiber diameter of the long fiber is not fixed [Reference] (Patent Document) Patent Document 1: JP-A-2008-264473 Japanese Unexamined Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. A fiber product (particularly woven fabric) made of a composite fiber having a main component and a composition of at least 4 composites is used as a sanitary material for sanitary articles such as sanitary napkins and disposable diapers. Since the surface material is in direct contact with the human body or the animal, it is strongly required that the surface material itself has an excellent touch. This requirement is constantly increasing. Specifically, in addition to a good surface feel (smooth feeling when touching the surface of the mold), it is also required to be in the thickness side = soft and fluffy, that is, it is difficult to make money and apply force in the thickness direction. The deformability f, that is, the greenness in the thickness direction and the feeling of the cushioning force in the thickness direction, which means that there is a rebound feeling, in other words, the body 323879 6 201241253 is required to recover. Further, not only the surface material of the sanitary article but also the fiber product from the fiber is expected to be produced as efficiently as possible. An indicator of productivity can be exemplified by high-speed combing when manufacturing non-woven fabrics. When making non-woven fabrics, when the short fibers are opened by the carding machine and the net is made, the knotting and the unevenness of the cloth are not generated according to the made net, and the speed of the net is made (in every 1 minute) The scale indicates how high the combing property can be determined. Non-woven mass production, for example, requires high-speed combing of 10 Om/m i η. It is not easy to obtain a composite staple fiber which has a good touch and is excellent in high-speed combing. For example, the significantly crimpable composite fiber described in Patent Document 1 is relatively soft, but has a problem of high-speed combing property deterioration. The fibers described in Patent Documents 2 and 3 are not soft because of the use of high-melting polyethylene, and the fiber assembly obtained by using the fiber does not exhibit a good touch (especially a surface touch). Patent Document 4 obtains a long-fiber nonwoven fabric having a special shape, whereby flexibility can be achieved. However, if fibers having an unfixed fiber diameter, such as short fibers, are passed through the combing, the fibers cannot smoothly pass through the combing, thereby causing knotting and Uneven quality. The present invention has been made in view of the facts of the present invention in order to obtain a composite fiber having a good touch and excellent high-speed combing property. I. The first component contains a density of from 0.90 g/cm3 to 0.94 g/cm3. The first component contains a density of from 0.90 g/cm3 to 0.94 g/cm3. Straight-chain polyethylene, and low-density polyethylene, 323879 7 201241253 and the first component is such that the low-density polyethylene accounts for 5% by mass to 25 of the total mass of the linear polyethylene and the low-density polyethylene. The mass % contains low density polyethylene; the second component contains 50% by mass or more of polyester, and the polyester has a melting point higher than 40 ° C higher than the melting point of the linear polyethylene constituting the first component, in the fiber cross section The first component comprises at least 20% of the surface of the fiber, the center of gravity of the second component is offset from the center of gravity of the composite fiber; and the composite staple fiber has at least one crimp selected by wave-shaped crimping and helical crimping. The present invention provides a method of producing a substantially crimped composite staple fiber. The linear poly-polymer having a density of from 0.90 g/cm3 to 0.94 g/cm3, comprising a method for producing a composite short fiber comprising a first component and a second component.晞, and low-density polyethylene, and the low-density polyethylene accounts for 5% by mass to 25% by mass of the first component of the total mass of the linear polyethylene and the low-density polyethylene, and has a content of 50% by mass or more. a second component of the polyester having a melting point higher than a melting point of 40 ° C or higher of the linear component of the first component, wherein the first component accounts for at least 20% of the surface of the fiber in the cross section of the fiber, and the second component The position of the center of gravity is melt-spun in a manner deviating from the position of the center of gravity of the fiber, and a spinning filament is obtained, and the spinning filament is at a temperature of Tg 2 ° C to 95 ° C (but the polymer contained in the second component of the Tg 2 system) In the composition, the glass having the highest glass transition point has a temperature extension of 1. 8 to 5 times in the range of 323879 8 201241253, and for the extended filament, the number of crimps is 5 peaks / 25 mm to The range of 25 peaks / 25mm gives mechanical crimping, from 50 to 115 ° C Annealing treatment is performed on the temperature in the circumference, and the annealed filament is cut into a length of lmn1 to 1 ;; and the composite short fiber has at least one selected by wave-shaped crimping and spiral crimping. A type of curling. The present invention further provides a fiber assembly containing 20% by mass or more of the above-mentioned remarkable crimped composite short fibers. The fiber assembly is preferably a non-woven fabric, more preferably a heat of the first component followed by a non-woven fabric. The present invention provides a surface material for a sanitary article which is formed from the aforementioned fiber assembly. The present invention further provides a sanitary article which is added to the aforementioned surface material. (Effect of the Invention) The substantially crimpable composite short fiber of the present invention, the first component comprising a linear polyethylene having a density of from 9090 g/cm3 to 94.94 g/cm3, and a prescribed amount of low-cost polyethylene; The second component contains 5% by mass or more of the polyester, and the second adult is offset from the center of gravity; and the significantly crimped composite short fiber has at least one crimp selected by wave-shaped crimping and spiral crimping. The remarkable crimping composite short fiber has excellent combing property, and can be obtained as a carding net with excellent cloth quality, and the fiber assembly (especially non-woven fabric) containing the fiber has good surface touch, and has fluffiness and thickness. Excellent flexibility and volume recovery in the direction. Further, the remarkably crimped composite short fiber system uses two types of polyethylene 323879 9 201241253 = two, and can be subjected to a wide temperature range when producing heat and then non-woven fabric. Therefore, the remarkable coiled composite short fiber is suitable for forming a product in which the surface of the biological product (4) is in direct contact with the fine material of the human animal, and the article can be manufactured with high productivity. The fiber assembly (especially non-woven fabric) containing the composite short fibers obtained by the method for producing the remarkably crimped conjugate fiber of the present invention has a good surface feel, and is excellent in bulkiness, flexibility in the thickness direction, and volume recovery property. Therefore, according to the aforementioned manufacturing method, the composite short fibers can be produced with high productivity, and the δ ray composite short fibers are suitable for the articles which constitute the surface material of the sanitary article and which are in direct contact with the delicate parts of the human body or the animal. [Embodiment] In order to achieve the above object, the inventors of the present invention considered that in the conjugate fiber, the low melting point component ensures the flexibility and thermal adhesion of the fiber, and the high melting point component ensures the bulkiness and volume recovery of the non-woven fabric, and must be provided. Withstand the rigidity of high-speed carding. Here, it is reviewed that the low-melting component is composed of a linear polyethylene having a good surface feel, the high-melting component is composed of a polyester, and a remarkably crimped composite fiber having a three-dimensional crimp is obtained. However, such a fiber is excellent in surface touch feeling, but it is not sufficient in high-speed carding property, bulkiness as a non-woven fabric, fogging property in a thickness direction, and volume recovery property. Here, the modified low-melting component is reviewed in a range that does not impair the surface feel of the linear polyethylene moth. As a result of the review, it has been found that a small amount of low-density polyethylene is added to a linear polyethylene having a density of a predetermined value or more without impairing the linear polyethylene, and a good surface feel is obtained, and a high-speed point can be obtained. It has excellent combing properties and is used as 323879 10 201241253. It is a composite short fiber which has excellent bulkiness, thickness direction flexibility and volume recovery when it is not woven. Therefore, the remarkably crimped composite staple fiber of the present invention is a substantially crimped composite staple fiber as described below. The first component contains a density of 〇. 90g/cm3 to 0.94g/cm3 of a straight-bonded polyethylene, and a low density. a polyethylene, and the low-density polyethylene is contained in the first component such that the low-density polyethylene accounts for 5 to 25 mass% of the total mass of the direct-bonded polyethylene and the low-density polyethylene; The composition contains 50% by mass or more of the polyacetate. The polyester has a melting point higher than a melting point of the linear polyethylene constituting the first component by 40° C. or more, and the first component accounts for at least 20% of the surface of the fiber. The center of gravity of the second component is offset from the center of gravity of the composite fiber; and the composite staple fiber has at least one crimp selected by wave-shaped crimping and helical crimping. The first component and the second component constituting the composite short fiber will be described below. The first component contains a linear polyethylene having a density of from 90 g/cm3 to 0.94 g/cm3, and a low density polyethylene. Linear polyethylene (also referred to as "LLDPEC Linear Low Density Polyethylene"), but the linear polyethylene used in the present invention is not limited to a low density (generally 0.25 gram/cm3 or less). A copolymer obtained by copolymerization of an α-olefin. The α-olefin is generally an α-olefin having 3 to 12 carbon atoms. Specific examples of the olefin having 3 to 12 carbon atoms include propylene, 1-butene, pentene, 4-methyl-1-pentene, hexene, 1-heptene, 1-octene, and 1- Terpenes, decenes, 1-dodecene and mixtures of these. Among these, propylene, 1-butene, 4-methyl-1-pentene, 323879 11 201241253 1-hexene, 4-methyl-1-hexene and octene are more preferred. Butene and 1-hexene. The α-olefin content in the linear polyethylene is preferably from 1 mol% to 10 mol%, more preferably from 2 mol% to 5 mol%. If the content of the α-olefin is too small, the flexibility of the fiber is impaired. If the content of the α-olefin is too large, the crystallinity may be deteriorated, and the fibers may be fused to each other during fiberization. The linear polyethylene used in the first component has a density of from 9090 g/cm3 to 0.94 g/cm3. When the density is less than 9090 g/cm3, the first component becomes soft, and sufficient bulkiness and volume recovery property cannot be obtained as a non-woven fabric, and high-speed combing property is not good at this point, and the fabric quality is not good. It is not woven. On the other hand, when the density of the linear polyethylene is more than 94.94 g/cm3, the nonwoven fabric will improve the bulkiness and volume recovery of the nonwoven fabric, but the surface feel of the nonwoven fabric and the flexibility in the thickness direction tend to be deteriorated. Therefore, the 'linear polyethylene preferably has a density of from 90.90g/cm3 to 0.935g/cm3' more preferably has a density of from 91g/cm3 to 0.935g/cm3, and more preferably has a 〇.913g/cm3. To a density of .935g/cm3. Further, the 'linear polyester' preferably has a melting point before spinning of 11 (TC to 125 C. Further, the melting point of the linear polyethylene is preferably higher than the melting point of the added low density polyethylene. If the melting point of the linear polyethylene is too high, then when the heat treatment is followed by low-temperature heat and heat is produced, then the nonwoven fabric is not practically obtained. If the melting point of the linear polyethylene is low, heat is applied at a high temperature. When the heat is processed and then non-woven, the surface feel of the non-woven fabric is lowered, or the high-speed combing property is not good, and the non-woven fabric with good cloth quality cannot be obtained. The melting point of the linear polyethylene is higher than that added to 323879 12 The melting point of the low-density polyethylene of 201241253, whereby the function of the linear polyethylene in the non-woven fabric is a skeleton polymer, and the low-density polyethylene can also exert the effect as a softening agent, and the fiber or even the fiber obtained therefrom The assembly can be suitably softened. The linear polyethylene having the above density and melting point can be easily obtained by copolymerizing ethylene with an α-olefin using a metallocene catalyst. The linear polyethylene is not limited to a polymerized using a metallocene catalyst as long as it has a density of from 0.90 g/cm 3 to 0.94 g/cm 3 , preferably having the above melting point, and can also be used, for example. Ziegler-Natta catalysts and agglomerates. Considering the spinnability, the melting index (MI) of linear polyethylene is preferably in the range of lg/10min to 60g/10min. The melting index (MI) is measured by JIS K 7210 (1999) (condition: 19 "C, load 21. 18N (2. Service (1)). The larger the MI, the slower the curing speed of the spinning. It is easy to dissolve each other. On the other hand, if the MI is too small, it is difficult to fibrillate. More specifically, the MI of the linear polyethylene is preferably corrected (10) to more preferably 3g/10min S 35g/1〇min, and more Good for 5g/10min to 30g/i〇mirl.

The linear molecular weight average molecular weight (M Ethyl and has a sub-V 5 value of 5 or less, then the linear poly-width (four) characteristics, will satisfy the _ circumference: =? _ in the first component' Excellent curling property 323879. Considering the properties of the resulting significantly crimped composite fiber and the tactile and bulky properties of the fiber assembly using the remarkable roll 13 201241253 shrinkable composite fiber, the bending flexibility of the linear polyethylene The rate is preferably in the range of 65 MPa to 85 MPa. Here, the bending elastic modulus is measured based on JIS K 7171 (2008). The significantly crimped composite fiber of the present invention has a linear composition of the main component of the first component. The soft touch of polyethylene, but only soft and fiber-free elastic, and the combing passability is reduced, and it is difficult to obtain a fluffy volume recovery fiber aggregate. Therefore, the linear polyethylene is preferably for bending. However, there is a certain degree of difficulty in deformation (that is, it is preferable that the degree of deformation is not higher than a certain degree for bending). Specifically, the bending elastic modulus is preferably 65 MPa or more. The bending elastic modulus of the linear polyethylene is too large. Lose soft touch The sensation is preferably 850 MPa or less. More specifically, the linear elastic modulus of the linear polyethylene is preferably from 120 MPa to 750 MPa, particularly preferably from i80 MPa to 700 MPa, and most preferably from 250 MPa to 650 MPa. The properties of the crimped composite fiber and the feel, bulkiness and volume recovery of the fiber assembly using the significantly crimped composite fiber, the hardness of the linear polyethylene is preferably in the range of 45 to 75. Therefore, the hardness of the linear polyethylene is based on JIS K7215 (1986), which is the hardness of the hardness meter (HDD) measured by a D-type durometer. When the chain polyethylene is too soft, the elastic force of the fiber is lost, and the combability of the fibers is lowered, so that it is difficult to obtain a fluffy fiber assembly, and the volume recovery of the fiber assembly is also lowered. Therefore, the linear polyethylene is reduced. It is preferable to have a certain degree of hardness, specifically, a hardness of 45 or more. If the hardness of the linear polyethylene is too large, the soft touch is lost, so it is preferably 75 or less. More specifically, 323879 14 201241253 It is said that the hardness of the direct-bonded polyethylene is preferably 48 to 70, particularly preferably 5 to 65, and most preferably 50 to 62. The first component contains the low male and the polyethylene (also called "Ldpe" is a soft polyethylene that is divided into many parts. It is also called high-pressure polyethylene because of its manufacturing method. In the present invention, significant shrinkage is achieved by adding a small amount of low-density polyethylene to the first component. Better performance, can improve the bulkiness and volume recovery of non-woven fabrics, and the speed combing. In addition, low-density polyethylene is softer than linear polyethylene, so for example, a high-density linear chain is used. The surface feel which is reduced in the case of polyethylene is ensured by low density polyethylene. The density of the low-density polyethylene is preferably from 91 g/cm 3 to 93 93 g/cm 3 . The density of the low-density polyethylene is dependent on the MI of the polymer (19 (rc). Therefore, the density of the low-density polyethylene is preferably from 915 g/cm 3 to 0.92 g/cm 3 . The melting point of the low-degree polyethylene is preferably (10) to 12 〇 &lt; t. In the present invention, it is preferred to make the (10) degree of the secret melting point (10). The low-density polyethylene which is low in point can be remarkable. The crimping is more excellent, and the field of hot working temperature in the production of the non-woven fabric is wider, and in addition, the non-woven fabric can be obtained after the heat treatment. More specifically, the low-density polystyrene (4) is preferably =115C. Particularly preferred is i00〇Ci u〇(&gt;c. In addition, low-density polyethylene, the point is preferably lower than the melting point of the aforementioned linear polyethylene. The low-density poly-ethylene refining point is better The melting point of the chain poly-ethylene is 5 ((: above, and the more concentrated polyethylene is lower than 1G °C. Right considering the spinning property, the melting index (MI) of low-density polyethylene) 323879 15 201241253 is preferably in the range of lg / lOmin to 60g / l 〇 min. Here, melting refers to

The number (MI) is measured based on JIS K 7210 (1999) (condition: i9 (TC, load 21.18N (2. 16kgf)). The larger the MI, the slower the curing speed of the sheath component during spinning, and the fibers are mutually It is easy to melt. On the other hand, if the town is too small, it is difficult to fibrillate. More specifically, the shot of low-density polyethylene is preferably from 3g/10min to 50g/lGmin, more preferably from 5g/1()min to 5〇g. /1〇min, more preferably 10g/l〇min to 5〇g/1〇min. The Q value in the low density polyethylene is preferably 1G or less. More preferably, the Q value is 9 and more preferably 5 Up to 8. If the q value exceeds 1 〇, a good curling performance axis cannot be obtained, and the strength tends to decrease. In the first injury, the total mass of the linear polyethylene and the low density polyethylene is the mass. In the case of %, preferably, the linear polyethylene is 95% by mass, 75 mass%, and the low-density polyethylene is 55% to 25% by mass. To the mass%, = density polyethylene accounted for 1G f%% to 2 () f amount %. ^The linear polythene proportion of the long-term eve 'is difficult to obtain the effect of adding low-density polyethylene, and ^ when not weaving The fluffiness of the cloth will also be degraded. If the proportion of the money is too large, the non-woven fabric with high strength cannot be obtained as the heat and then the non-woven fabric. The right 3 low-density polyacetonitrile is in the above-mentioned range _, then in the composite short fiber = performance Good reading, science, silk is _ not - less, 2 will raise the fiber of the coil, this 'bubble containing the fiber b:, good. Easy to express the reasons for the three-dimensional crimp is not certain, However, it is presumed that in the direct-bonded polyethylene component of the knives, the low-density polyether is 323879 201241253. The length is divergent and extends to easily cause deformation, so it is easy to express the three-dimensional crimp. In particular, the present invention is not limited thereto. In addition, low-density polyethylene has the function of a softening agent, so if it contains a low-density polyethylene bond of the above range, for example, when a linear polyethylene having a high density is used, the obtained non-woven fabric is displayed in the thickness direction. Excellent softness and good surface feel. In addition, if the low-density polyethylene is contained in the above range, the processing temperature of the nonwoven fabric can be broadened, and the manufacturing heat is not restricted. Limited to processing temperature, and can obtain a non-woven fabric with almost fixed soft touch. As long as the composite short fiber exhibits sufficient three-dimensional crimping and is a non-woven fabric with good touch, the first component may contain linear polyethylene and low density. Other polymer components other than polyhexene. For example, the first component may contain high density polyethylene, polypropylene, polybutene, polybutylene, polydecene pentene resin, polybutadiene. , a propylene-based copolymer (for example, a propylene-ethylene copolymer), an ethylene-vinyl alcohol copolymer, an ethylene-vinyl phthalate copolymer, an ethylene-(mercapto)acrylic acid copolymer, or an ethylene-methyl (meth) acrylate copolymer Polyolefin resin, polyethylene terephthalate, polybutylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly Polyurethane resin such as lactic acid, polybutylene succinate and copolymer thereof, polyamide amine resin such as nylon 66, nylon 12, and nylon 6, acrylic resin, polycarbonate, and poly Acetal, polystyrene The selection of a cyclic polyolefin and engineering plastic, a mixture of these, and those of the elastic body (Elastomer) resin based polymer or a plurality of component 1. The polymer component of the first component is preferably a linear polyethylene and a low density 323879 17 201241253. The total mass of the polyethylene is 50% by mass or more, more preferably π% by mass or more, and even more preferably only Polymer composition. The first component may contain components other than the polymer component, for example, an antistatic agent, a pigment, a matting agent, a heat stabilizer, a light stabilizer, a flame retardant, an antibacterial agent, a slip agent, a plasticizer, a softener, and an anti-static agent. Additives such as oxidizing agents, ultraviolet absorbers, and crystal nucleating agents. Such an additive is preferably contained in the first component in an amount of 10% by mass or less based on the entire first component. The polymer component of the second component contains 50% by mass or more of the melting point higher than the melting point of the linear polyethylene constituting the first component. (The above polyester. The polymer component of the second component preferably contains 50% by mass or more of the polyester, more preferably 75% by mass or more, and most preferably 1% by mass. Compared with other polymers Polyester is cheaper and has high rigidity, and is suitable for use because it imparts fiber elasticity. Polyesters include polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate. a polymer or a copolymer such as polyethylene naphthalate or polylactic acid, wherein the melting point of the polyester is higher than the melting point of the linear polyethylene constituting the first component and the component is higher than 〇. The melting point temperature is higher than the melting point of the linear polyacetate above 50〇c. The polyester in the above is compared with polytrimethylene terephthalate, polyethylene terephthalate and polyparaphenylene. The butyl phthalate has high rigidity and imparts elasticity to the fiber. Therefore, the high-speed combing property of the significantly crimped composite short fiber is good. Especially, it is most suitable for the rigidity of polyethylene terephthalate. Poly(p-ethylidene dicarboxylate) can also be used to adjust the elongation of the fiber by suitable adjustment However, it has high crystallinity and becomes difficult to heat shrink, so that a remarkable crimped composite short fiber which does not exhibit or exhibits only a slight potential curling property can be obtained. If 323879 18 201241253 is used, such a remarkable crimping compound is short. Non-woven fabric made of fiber, when the net is heat treated, no or only slight shrinkage occurs in the net, which will remove or reduce the trouble of manufacturing engineering management caused by shrinkage of the net. The second component is more suitable for polyester containing poly-p-benzene. When ethylene diacetate and/or polybutylene terephthalate and other polymer components are used, the other polymer component exhibits sufficient three-dimensional crimping and imparts good fibers to the composite short fiber. The touch is not particularly limited. For example, other polyester resins, specifically, polyethylene naphthalate, polylactic acid, and poly(trimethylene terephthalate) may be mixed. However, poly(p-phenylene terephthalate) The diester is soft as described above, and the high-speed carding property of the obtained fiber tends to be lowered, so that it is preferably not used in the remarkably composite short fiber of the present invention. The second component may contain a polymer. Ingredients other than parts, such as antistatic agents, pigments, matting agents, thermal stabilizers, light stabilizers, flame retardants, antibacterial agents, slip agents, plasticizers, softeners, antioxidants, UV absorbers, crystallized An additive such as a nucleating agent. The amount of the additive is preferably contained in the second component in an amount of 10% by mass or less based on the entire second component. In the significantly crimped composite staple fiber of the present invention, (second component/first A component) is preferably from 8/2 to 3/7 (volume ratio), more preferably from 7/3 to 35/65, most preferably from 6/4 to 4/6. Manufactured from the remarkable crimping fiber of the present invention When non-woven, the second component mainly imparts bulkiness and volume recovery to the non-woven fabric. The first component mainly imparts the strength of the non-woven fabric and the softness of the non-woven fabric. If the composite ratio is 8/2 to 3/7, the non-woven fabric strength can be simultaneously achieved. And softness and volume recovery. If the composite ratio is too large, the non-woven strength will increase, but the resulting non-woven fabric will become hard and the volume recovery tends to deteriorate. 323879 19 201241253 On the other hand, if the amount of the second component is too large, the dot becomes too small, and the strength of the nonwoven fabric is reduced, so that the volume recovery property tends to be deteriorated. In the significant crimping composite of the present invention, the position of the center of gravity of the second component is offset from the position of the center of gravity of the fibers in the cross section of the fiber. Fig. 1 is a view showing a fiber cross section of a composite short fiber in an embodiment of the present invention. The first component (1) is disposed around the second component (2), and the first component (1) accounts for at least 20% of the surface of the fiber (10) in the fiber cross section. Thereby, the surface of the first component (1) is melted upon heat. In the fiber cross section, the position (3) of the center of gravity of the second component (2) deviates from the position of the center of gravity (4) of the fiber (10), and the ratio of the deviation (hereinafter referred to as eccentricity) means that the fiber cross section of the composite short fiber is Enlarged photographing by an electron microscope, etc., and the position (3) of the center of gravity of the second component (2) in the fiber cross section is taken as C1, and the position of the center of gravity (4) of the fiber in the fiber cross section of the significantly crimped composite fiber (10) is taken as Cf, When the radius (5) of the fiber cross section of the significantly crimpable composite fiber (10) is taken as rf, the numerical value of the following formula is used. The eccentricity 丨Cf_Cl | /rf]xl00 The position of the center of gravity of the second component (2) (3) is the fiber cross section of the position of the center of gravity of the fiber (4), and the preferred form is the eccentric core sheath type shown in Fig. 1. Or it is a side-by-side type. Depending on the situation, it may also be present in a multi-core type that is concentrated in a multi-core portion and deviated from the center of gravity of the fiber. In particular, if the cross section of the eccentric core-sheath type fiber is easily expressed as a wave-shaped crimp and/or a spiral crimp, it is preferable from the viewpoint. The eccentricity of the eccentric core-sheath type composite short fibers is preferably from 5% to 50%. A better eccentricity is 7% to 30%. In addition, the shape of the fiber cross section of the second component may be elliptical, Y-shaped, X-shaped, well-shaped, polygonal, star-shaped or the like in addition to the circular shape, and the composite short 323879 20 201241253 fiber (ίο) fiber cross section In addition to the circular shape, the shape may be an oval shape, an X shape, a well shape, a polygon shape, a star shape, or the like. Fig. 2 is a view showing a crimped form of a remarkably crimped composite short fiber in an embodiment of the present invention. The wave-shaped crimping system according to the present invention means that the crimped portion is curved as shown in Fig. 2 . The spiral crimping indicates that the rolled portion is a spiral bend as shown in Fig. 2B. The crimping in which the wave-shaped crimping and the spiral crimping are mixed as shown in Fig. 2C is also included in the present invention. In the case of the normal mechanical crimping as shown in Fig. 3, the rolled roll is a corner, that is, it is directly zigzag-shaped, and the volume recovery property cannot be increased as a non-woven fabric. Furthermore, the elasticity of the surface to be compressed, i.e., the spring effect, is not good, and in particular, sufficient volume recovery is not obtained. Further, if it is a crimp of an acute angle of mechanical crimping as shown in Fig. 4, the crimping in which the wave shape shown in Fig. 2a is mixed is also included in the present invention. The present invention includes a wave-shaped crimp and a helical crimp ′ and is distinguished from a mechanical crimp as a three-dimensional crimp. In the present invention, in particular, the crimping in which the wave-shaped crimping and the spiral crimping are mixed as shown in Fig. 2C is preferable from the viewpoint that the combing passability and the initial volume and volume recovery property can be simultaneously achieved. The significantly crimpable composite staple fibers of the present invention can be produced in the following order. First, 'the first component containing linear polyethylene and low-density polyethylene, and, for example, 50% by mass or more of polyethylene terephthalate and/or poly-peptidic> butyl phthalate The two components are disposed in such a manner that the first component of the fiber cross section accounts for at least 20% of the surface of the fiber, and the position of the center of gravity of the second component deviates from the position of the center of the fiber, and a composite nozzle such as an eccentric core sheath inflammation composite nozzle is used. The second component is melt-spun at a spinning temperature of 240 ° C to 330 ° C, a temperature of 323879 21 201241253 parts at a spinning temperature of 200 C to 300 ° C, and is extracted at a drawing speed of 100 m/min to 1500 m/min. And we have to spin the filaments. Next, the glass transition point (Tg2) of the polymer component having the highest glass transition point among the polymer components contained in the second component is less than the extension temperature of the melting peak temperature of the linear polyethylene, and The elongation treatment was carried out at a stretching ratio of 1.8 times or more. A better extension temperature lower limit is the temperature than Τρ is still l〇°c. Preferably, the upper limit of the extension temperature is 95 &lt; 3c, and the upper limit of the extension temperature is particularly preferably 90 t. If the extension temperature is lower, the crystallization of the second component is difficult to proceed. Therefore, the heat shrinkage of the second component in the obtained fiber becomes large. It was also confirmed that the nonwoven fabric produced from the obtained fiber tends to have a small volume recovery property. If the elongation temperature is higher than the melting peak temperature of the linear polyacetamide, the fibers will fuse with each other, which is not preferable. A better lower limit of the stretching ratio is 2 times, and particularly preferably, the stretching ratio is 2.2 times, and the optimum stretching ratio is 24 times lower. The upper limit of the extension ratio is 5 times, the upper limit of the extension ratio of the cage is 4.G times, and the best; the upper limit of the stretching ratio is 3.5 times. If the stretching ratio is less than 18 times, it is difficult to obtain a fiber which exhibits a wave shape curling and/or a spiral crimping because of the low d magnification, and as the non-woven fabric, not only the bulkiness is reduced, but also the rigidity of the money itself, so the combing is performed. By turning the non-woven fabric into poor performance, or the volume I renaturation has a tendency to decrease. Further, it is necessary to perform the annealing treatment in an atmosphere of dry heat, moist heat or the like at a temperature at which the fibers of the U5C are not smelted at the time of stretching. ........, the known crimper is used as the material fiber processing or post-filling box SU lngbQX), and the number of crimps is given 323879 22 201241253 5 peak / 25mifl Up to 25 peaks / 25mm curl. The crimped shape or wave shape is curled by the crimping machine. If the number of crimps is less than 5 to 25 mm, the passability of the knife is reduced, and the bulkiness of the non-woven fabric and the volume recovery are prone to deterioration. On the other hand, if the number of crimps exceeds the π peak size, the combing property is lowered due to the excessive number of crimps, and not only the fabric of the non-woven fabric is deteriorated, but also the initial volume of the non-woven fabric is also small. . Further, it is preferred to carry out the annealing treatment after the crimping machine is crimped and then subjected to another Π5 C dry..., moist heat, or a hot air atmosphere. The three-dimensional crimping exhibited in the significantly crimped composite short fibers can be promoted by annealing. With, let's say. After the fiber treatment agent is applied, the crimping machine is crimped, and the annealing treatment is carried out in a dry heat atmosphere of another C to 115 C, and at the same time, the drying treatment can be carried out to make the step abbreviated. If the annealing treatment is less than 5 {rc, the dry shrinkage rate of the fiber tends to be large, and the resulting nonwoven fabric is implicated, and the productivity is lowered. In addition, the returning process and the drying time: when the annealing temperature is less than 5, the drying of the fiber may not be obtained by such a method, and the significantly crimped composite fiber exhibiting the three-dimensional crimping may be obtained. In the thus obtained synthetic composite short fiber of the present invention, if the test material is tested, the number of condensed numbers (three-dimensional crimping number) is preferably 12 Peak to 18 peaks/2'. Further, when the significant roll-cut material of the present invention is measured on the basis of 1 == 5 (2 () 1 () years), the volume___four ratio (volume ratio/volume number) is preferably 0·7 to U, better (four) magic. The crimping rate indicates that the curling is mosquitoous (the length of the winding is difficult). If the winding yard has a full scale of 323879 23 201241253, the curling is difficult to stretch and has a moderately sized waveform and/or spiral crimping. The carding passability is good, the fluffiness is maintained by the net after the carding, and the non-woven fabric after the heat treatment can maintain the elasticity. The fineness and fiber length of the remarkably crimped composite short fibers of the present invention are not particularly limited and are selected depending on the use. For example, the remarkably crimped composite short fiber of the present invention is prepared by a carding machine (or other means), and then the fibers are thermally bonded to each other to produce heat and then non-woven fabric. In this case, the fineness is preferably used. The fiber length is preferably from 1 to ldtex to 15 dtex, and the fiber length is preferably from imin to 100 mro. 5dtex。 3. The dtex is preferably 1. 5dteX to 3. 5dtex. These deniers and fiber lengths can be used in the manufacture of non-woven fabrics other than non-woven fabrics. Specifically, the remarkably crimped composite staple fiber of the present invention has a dry non-woven fabric (for example, air-through non-woven fabric, south sprinklace non-woven fabric, needle-punched fabric) suitable for use in fabricating a fiber web by a carding machine (for example) Needle punch) non-woven fabric, etc.) fiber length (fiber length 15ram to 80mm, more preferably 32mm to 64mm), suitable for making wet non-woven fabric fiber length (fiber length lmm to 20mm, more preferably 3mm to 15mm), or It is sufficient to have a fiber length (iram to 30 mm, more preferably 5 mm to 25 mm) suitable for producing an air-laid nonwoven fabric. The fineness can be adjusted as desired by adjusting the fineness and the stretching ratio of the spun filament. The fiber of a predetermined length is obtained by cutting the fiber after the annealing treatment. The fiber assembly contains 20% by mass or more of the significantly crimpable composite short fibers of the present invention described above, thereby forming a soft fiber aggregate having a good surface feel, fluffy 323879 24 201241253, and a thickness direction. A fiber assembly excellent in volume recovery. κ woven and non-woven fabrics. At the same time, the receiver also describes a non-woven fabric of a specific example of the fabric of the present invention, the squadron, and the moon, and a manufacturing method thereof. The 〇/ LV μ 贝 卷 性 复合 复合 含有 含有 含有 含有 含有 含有 含有 含有 含有 含有 制作 制作 制作 制作 制作 制作 制作 制作 LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV LV She &amp; Shi, the dimension of each other's integration, and thus not to weave. When other fibers are used, the fiber or the fiber may be made of cotton, silk, hand hair, hemp, pulp, etc., depending on the application, such as cuprammonium, cuprammonium, acetophenone (tetra), poly-I. The synthetic fibers such as polyamines, polyamines, and m.^21鲛s are selected from the group of fibers or a plurality of fibers. == can be mixed with this hair ^ significant volume secret domain dimension, = use. &amp; month's remarkable crimping composite short fiber made of fiber mesh layer (4) when the money cloth is mentioned, the fiber fiber can be listed as: parallel net, method 2 = 罔纟 rule net, father wrong net, and cross staggered network Two or more different types of fiber webs, such as a comb, a 1:, a, a week, a wet papermaking web, and a spunbond web. The non-woven fabric is produced by the remarkable crimped composite short fibers of the present invention. Preferably, the heat treatment is carried out on the fiber web, and the crepe is obtained in the form of heat of the first heat and then non-woven. The heat and the non-woven fabric significantly contribute to the effects (softness in the thickness direction, volume recovery property, and volume recovery property) of the remarkable crimped composite short fibers of the present invention. In order to complex the fibers, the fiber web may be subjected to a needle punching treatment and a water flow entanglement treatment before and/or after the heat treatment. 323879 25 201241253 In order to obtain heat followed by non-woven fabric, heat treatment is performed on the aforementioned fibers _ by a known means. Heat treatment means == no = under-attached heat treatment machine and infrared heat treatment = heat treatment conditions, select the full material. The heat treatment temperature is equal to π and/or the first component is softened and the fiber is subjected to the condition that the shrinkage composite composite solid crimp is not crushed. For example, the linear polyethylene is spun. Look for the front of the silk (four) temperature (When the straight chain of the Wei is in the first component, the highest and simple money is collected as (4), the heat treatment temperature is difficult (four) and the peak of the solution is:). The better heat treatment temperature range is ( Tm+5yc to (Tm+ heart is so hot, then the surface of the non-woven fabric is drought-dried and the direction is soft. The thickness of the money cloth is shown as the "compressed volume" index, compared with the same thickness = the smaller the volume after compression Non-woven fabric is thick, ''. (4) Right PCT w * Easy to compress"' and the softness of the soft 匕 non-woven fabric thickness direction can be expressed as "an index of volume change. For the original non-woven volume (thickness), the body _ degree) changes The ratio of the quantity indicates that the = change rate is soft in the thickness direction by the compression cloth. The volume containing the roll = the heat of the woven fiber and then the non-woven body...: The curling compound of the page is shorter than the thief. The change rate is better. More than 85%. Better yet, hot Then, the non-woven fabric can be evaluated by the recovery of the thickness product (volume recovery after compression). The recovery volume after compression 3 323879 26 201241253 shows the volume recovery in the thickness direction of the non-woven fabric, and the larger the recovery volume is the cushioning property. (elasticity) When the non-woven fabric which is shock-absorbing, for example, is used as a surface material for sanitary articles, it will move with the body and enhance the susceptibility to the skin. The volume recovery after compression is expressed by removing the load from the compressed state and passing through The ratio of the non-woven volume (thickness) after a certain period of time to the non-woven volume (thickness) before compression, the greater the volume recovery after compression, the greater the shock absorption. The significantly crimped composite staple fiber of the present invention is contained. The volume recovery rate of the heat-non-woven fabric is preferably 60% or more, more preferably 65% or more, and particularly preferably 68% or more. The surface of the heat-bonded non-woven fabric is soft, fluffy, and volume-recoverable in the thickness direction ( The elastic evaluation method is based on the KES (Kawabata Evaluation System) and can be measured and/or evaluated according to the KES (Kawabata Evaluation System). The surface feel of the cloth can be evaluated by measuring the value of the surface friction property defined by KES. The softness, bulkiness, and volume recovery (elasticity) of the heat in the thickness direction of the nonwoven fabric can be determined by KES = compression test The load-displacement curve shifts the value of the compression characteristic and the price is flat. Specifically, the characteristic value of the surface friction is the change of the average friction coefficient (hereinafter referred to as MIU) and the average material coefficient (also referred to as the friction coefficient). The work difference, hereinafter referred to as _._ indicates the difficulty of surface sliding (or slip-X), the larger the MIU means that it is difficult to slide. The MMD indicates the friction. The more the surface of the MMD is, the more the surface of the MMD. The heat then follows the surface of the non-woven fabric, (four) high: volume 323879. (4) Touching such a non-woven fabric will have a sense of resistance, but at the same time it will have D, and feel. Therefore, there will be a unique 27 201241253 touch called "smoothness" and "wetness". The apparatus for measuring the characteristic value of the surface friction is not particularly limited as long as it is a surface friction measurement based on KES. The characteristic value of the surface friction can be measured, for example, by using a KES-SE friction feeling tester, a KES-FB4-AUT0-A automated surface tester (all manufactured by Keskato Co., Ltd.), or the like. The compression characteristic value is a compression hardness (also referred to as linearity of compression characteristics hereinafter referred to as LC), compression energy (also referred to as compression work amount, hereinafter referred to as WC (gf · cm / cm 2 )), and compression elasticity ( Resilence) (also known as compression recovery, compression recovery rate, hereinafter referred to as rC (%)), T. (The thickness of the load is 〇5gf/cm2 (then 〇), Tro (the thickness of the load of 5〇gf/cm2 (mm)), and the compression ratio (using the above Tq, Tm and 1〇〇x (Tq) -Tm)/T. The formula is hereinafter referred to as EMC (%). LC indicates compressibility with a small force, and the larger the LC, the harder the compression. wc indicates the amount of compression, and the larger the wc, the thickness The softer the direction and the easier the compression. RC indicates the elasticity (compression, resilience) for compression, and the larger the RC, the easier it is for the compression to rebound, that is, the shock absorption. EMC indicates the thickness change when the load is applied to the type. Proportion, the larger the EMC, the softer and more fluffy, and the greater the deformation when applying the load. The heat of the remarkable crimping compound_dimensional heat of the present invention is only due to the large compression ratio, and the initial volume is large, and the dream is large. Ww has small compression hardness, large compression energy, and is 0-weight and soft. It contains the remarkable crimping property of the present invention. The hot-bonded non-woven fabric of short fibers is also excellent in shock absorption due to the elasticity of compression. The machine that measures the compression characteristic value obtained by the rotation=heavy-displacement curve is measured as a reference (4) Hidden value machine ^卩钱观定323879 28 201241253 1L=Compression one for one share has no weaving ΓΓ ΓΓ: heat followed by non-woven surface friction, can be produced in the cloth = hot air surface for the measurement surface, longitudinal direction In order to measure the direction (also called the direction), the static load is the coffee, and the moving speed of the friction is lmm/sec Γ1Γ, which is the compression characteristic value obtained by the movement of the load-shift curve in the test of the county. It is possible to produce a non-woven fabric =, the wind surface is a measuring surface, a circular pressure plate having a use area of W, a speed of 0 m/see, an upper limit load of 5 Qgf /, and a foot sensitivity of 20. The heat of the significantly crimped composite short fiber is then non-woven to make the touch smooth and soft. In order to feel the softness when touching the same, it is important that the characteristic value of the surface friction according to the aforementioned KES = the average friction coefficient _) And the change in the average coefficient of friction (10)). In the heat-containing non-woven fabric containing "the remarkable crimped composite short fiber of the invention, the average friction coefficient MIU of the surface of the non-woven fabric of the supporter is preferably 0.3 or more, 〇6:: The average hybrid coefficient is 〇.3 or more, that is, the friction is higher. Spicy non-woven fabric woven: Ϊ degree 'County makes the heat back (four) cloth in the Lang Muscle, heat does not:: There will be moderate friction and resistance between the skin and the skin, the feeling of touch is "slip 323879 InMo (four) Γ + + friction coefficient It is not too large and the touch is deteriorated (for example, the feeling of sticking to the skin and the feeling of touch are caused by the rubbing). The flat-MIU is more preferably 3·3 or more, 〇·5 or less, and especially good 〇 Offense

S 29 201241253 or more, 0.45 or less. Then the heat of the human fiber is followed by the non-woven fabric. The remarkable crimping composite shortness of the invention is 0. G16 or less. The variation of the friction coefficient of the sentence is below 〇, ϋ the surface of the non-woven fabric is not (9) One borrows rm. gi * ^ &quot;铋, and the right average friction coefficient miu satisfies the aforementioned red circumference, then the two add the heat so that the non-woven fabric 2 has a unique "smoothness, a soft moon, a soft The variation of the ten-thickness coefficient is better than 015. The lower limit of the average friction coefficient is not particularly limited. The closer to 0, the better, but it can be 0.001 or more. 2 The hot cloth of the remarkable crimping composite short fiber of the invention is not only initially bulky, but also soft and easy to weave when applying a load, and the right weight is removed or the load is small, and there is a rebound and heat is not included. The characteristics of the reply. In order to show the characteristics of these compressions and pressures and discharges, it is important to refer to WC, RC, and EMC in the aforementioned KESa shrinkage characteristic values. In the case where the remarkable crimping composite of the present invention is short and the nonwoven fabric is not woven, the compression hardness (LC) is preferably 〇 64 or less.热,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The lower limit of the degree (LC) is not particularly limited, but may be 〇 糨 hard • ϋ 2. Further, the compression hardness (LC) is determined by the density (g/m2) of the non-woven fabric and the larger the loudness, and the compression hardness is also increased. Therefore, the hardness (LC) value can be divided by the value of the density, that is, the compression hardness (LC) per unit density ^ 2 ) as the compressive property value of the thermal adhesive non-woven fabric to evaluate the significant crimping compound of the present invention. The heat of the short fibers is then in the non-woven fabric: the density (LC) of the bit density (10) is preferably 0.013 or less, and more: 323879 30 201241253 0. 012 or less. In the significant crimping composition according to the present invention, the compressive energy (WC) is preferably 彳n f / 2 ... the nonwoven fabric is not more than 1 · / 2,,,,, gf · Cm / cm or more. The entangled energy (WC) is large and 1 cm or more, so that the non-woven fabric is deformed when the load is applied. _ · ―2 is 4.5 gf · cm / cm 2 or more, and most preferably 5. lgf · cm / cm 2 : ' The upper limit of _ energy is not particularly limited, but if it is greater than 8 〇 22 I I: it will affect other compression characteristics, so it is preferably 8· 〇gf • (10) heart 2 is preferably 6. 〇gf · cm/cm 2 or less. (4) The heat of the significantly crimped composite short fiber of (4) is followed by the non-woven fabric 587 : &lt; Bu elastic WO is preferably more than the above. By compressing the elastic energy. On top, the heat is then non-woven, which is excellent in anti-doping and the volume is not woven with the recovery when the load is reduced. In particular, by satisfying the first two, the hardness (10) is satisfactory, and the compressive elastic energy (10) satisfies the preferred range, the non-woven fabric is softened for the deformation of the compression, and the load is reduced, and the "product (ie, the original impurity) is recovered. Then, the non-woven fabric is a non-woven fabric that is easy to change with the body concave and convex portion. If the non-woven fabric is used for the surface material of various degraded materials, the surface material will compress/recover with the change of the body movement and posture. The advantage of close body and comfort. The upper limit of the compressive elastic energy (RC) is not particularly limited and may be 1%, 90% or §5%. The heat-contained nonwoven fabric containing the remarkable crimped composite staple fiber of the present invention preferably has a second compression ratio (EMC) of 70% to 98%. Here, the compression ratio means that the thickness is τ when the load is G.5gf/cm. When the load is 5〇gf/cm2, 323879 31 201241253 The thickness is Tm' and the compression characteristic value is obtained by EMC(%) = 100x(T.Tm)/T〇. When the compression ratio is less than 70%, the volume is small at the beginning and is not easily deformed for compression. When the load is applied to the heat and then the nonwoven fabric, the ratio of deformation can be small as the load increases, and the touch becomes hard. When the compression ratio is more than 98%', the deformation at the time of applying the load is excessively large, so that not only the shape retainability is liable to be lowered, but even if the load is small, the heat is crushed and then the nonwoven fabric is not formed to have a flat sheet shape. The compression ratio (EMC) is preferably from 72% to 95%, particularly preferably from 75% to 90%, most preferably from 78% to 85%, in the heat of the non-woven fabric using the remarkable crimped composite short fibers of the present invention. The fiber assembly of the present invention, especially the non-woven fabric, more particularly the heat-resistant non-woven fabric has a good touch and has the characteristics of recording and shock absorption, so it is suitable for the surface material of sanitary articles such as raw cotton and paper diapers, Wet wipes, wipes, cosmetics materials, women's underwear pads, shoulder pads, vehicle shock absorbers, base materials for floor warm floor, cushioning materials, and bag materials. The heat of the present invention is suitable for sanitary The surface material of the article may additionally provide a sanitary article using the heat-bonding woven fabric of the present invention as a material. Hygienic articles contain products that absorb the blood, body fluids, and pterine of humans or animals; they are diapers, sanitary napkins, and urinary products, also known as absorbent articles. The surface material is directly adhered to the delicate part of the human body or animal, and has excellent characteristics. ==: softness and shock absorption. Touch, softness and Zhaoji reply =: The weaving fabric is as good as the above, and it is suitable as a surface material; 323879 32 201241253 Other components are simultaneously composed Hygiene items. In particular, the heat of the present invention is as follows: when the density of the sanitary article is preferably from 10 g/m2 to 70 g/m2, more preferably 15 g/m2, the density can be in the range of 6*6 g/m2 according to the axis of the sanitary article. . ~ The heat of the invention is then used when the non-woven fabric is used for other purposes. 'When the heat of the present invention is used as the sanitary material 3, it is preferable to contain 2 g% by mass or more of the above-mentioned remarkable rolled surface use dimension, more preferably 50% by mass or more, and particularly preferably contains a blend. More than the fin fiber. When the ratio of the above-mentioned remarkably crimped composite short fibers is within 80% by mass, it is not only used as a surface touch of the surface material, but also has a large thickness and a shock absorption property, and can be used to prevent dry skin and the like. Flexibility (Example) Find the function. [Examples 1 to 13 and Comparative Examples 1 to 6] (First component) The following linear polyethylene (LLDPE), low density polycap, and high density polyethylene (HDPE) were prepared. (LDPE) LLDPE-1: a linear polyethylene group polymerized by a metallocene catalyst (manufactured by Yu-Yu Polyethylene Co., Ltd., trade name "420SD", density in methene hexene 0. 918g/cm3, Q The value is 3.0, MI = 7 g/10 min, melting point 1 copolymerization, bending elastic modulus: 280 MPa, hardness (HDD) 52). LLDPE-2: Linear polyethyl fluorene polymerized by metallocene catalyst (manufactured by Utsuka Polyethylene Co., Ltd., trade name "UMERIT (registered trademark) J", density 0. 931g/cm3, Q value 3 0, MI = 20g / l〇min, w 631 1 melting point 323879 33 201241253 12〇C hexane co-polymerization, - flexural modulus 600MPa, hardness (HDD) 60). LLDPE 3·metallocene catalyst-polymerized linear polyethylene (manufactured by The Dow Chemical Co., Ltd., trade name “Αςρττ°, ASPUN (registered trademark) 6835Α), density 0.950g/cm3, Q value q ς Μτ value 3· 5. MI = i7g/i〇min, melting point 126 ° C, octene copolymerization). Linear polyethylene (polymerized by Nippon Polyethylene Co., Ltd., trade name "KERNEL (registered trademark) KS560T", density 〇898S/cm3, Q value 3.1, MI = 16g, polymerized by LLDPE 4·metallocene catalyst. /10 min, melting point 86 &lt;:, hexa-copolymerization, flexural modulus 62 MPa, hardness (HDD) 40). LLDPE 5·Zigler-Natta catalyst-polymerized linear polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name "Aet ATEC (registered trademark) UJ370T", density 〇. 92ig/cm3, Q value 4 · 2, MI = 22g / 1〇min, melting point 121 C, hexene copolymerization, bending elastic modulus i8 〇 MPa, hardness (HDD) 50). LDPE-1: manufactured by Nippon Polyethylene Co., Ltd., trade name "N0VATEC (registered trademark) LJ802", density 〇. 918g/cm3, Q value 5. 3, MI = 22gM0min, melting point 106 °C. LDPE-2: manufactured by Nippon Polyethylene Co., Ltd., "NOVATEC (registered trademark) LJ902", density 0·915 g/cm3, Q value 5. 3, MI = 45 g/10 min, melting point 102 °C. LDPE-3: N0VATEC (registered trademark) LC720, density 〇 · 922g/cm3, Q value 5.3, MI = 9. LDPE-4: manufactured by Ube Maruichi Polyethylene Co., Ltd., trade name 323879 34 201241253 "]2516", density 〇.916§/(:1113, 豺==25 to 1〇111111, melting point 1〇6. (: LDPE-5: manufactured by Ube Maruyama Polyethylene Co., Ltd., trade name "J3519", density 〇. 916g/cm3, MI = 35g/10min, melting point 108°C HDPE: manufactured by Sakamoto Polyethylene Co., Ltd. "N0VATEC (registered trademark) HE481", density 〇 956g/cm3, q value 5.6, MI = 12g/10min, melting point i33 ° C, bending modulus 900 MPa, hardness (foot) 64. (second component) Preparation of polyethylene terephthalate (manufactured by Toray Co., Ltd., trade name "T200E", melting point 250 ° C, ultimate viscosity value (IV value) 0.66) as the polymer constituting the second component. The polymer shown in Tables 1-1 to 1-3 (mixing ratio (mass) in parentheses) was used. The second component was the above-mentioned trade name "T200E", and the eccentric sheath-core composite nozzle (600 holes) was used. 2 The composition ratio of the first component/second component (volume ratio) is 55/45, and the spinning temperature of the sheath component is 26 0 °C, the spinning temperature of the core component is 300. 0, the nozzle temperature is 290. (: and the melt squeezing ', the eccentricity of 25%, the fineness of 6. 8dtex spinning filaments. Spit out during smelting extrusion The amount of the spinning filament is 2.6 m/inin. The obtained spinning filament is extended by 2.6 times in TC hot water and becomes an extension filament having a fineness of about 3.3 dtex. An oil agent prepared by mixing a potassium salt with a potassium salt of a C12 alkyl ester of phosphoric acid at a ratio of 35:65 as a fiber treating agent, and imparting a mass ratio of 0.3% by mass, and then imparting a peak of 12/25 mm to the extending filament by a stuffing box type crimping machine. Mechanical crimping "Next, the hot air blowing device set to 丨 (10) is blown for about 15 minutes, and in the flaccid state, the annealing portion is simultaneously performed 323879 35 201241253, and the drying process is followed. 'The filament is cut into fiber lengths. 51 mm, and significantly crimped composite short fibers were obtained. Spinning properties and elongation were good in all of the examples and comparative examples. A fiber web having a density of about 50 g/m 2 was produced from the obtained fibers using a roll carding machine. For the LLDPEC which constitutes the first component of each fiber, only the melting point of Comparative Example 6 is HDPE) is 10 ° C higher. a hot air blowing device, which heats the fiber web for 10 seconds to melt the first component, and obtains heat and then non-woven fabric. However, in Example 2, Example 6 and Comparative Example 1, 123: (: and 138°) The non-woven fabric is produced by heat treatment of the crucible. The following evaluations are carried out for the crimping composite short fibers and the heat non-woven fabric. [棬% performance] The crimp of the fiber after the annealing treatment was observed and evaluated according to the following criteria. A: A good three-dimensional crimp is confirmed. B: It was confirmed that the crimping depth was large and the wave shape was curled. C: It is confirmed that the shape of the wave is curled, but the length between the roll and the roll is smaller than that of the roll, and it is a loose crimp. D: Only the ore-like crimping imparted by the mechanical crimping was confirmed. The number of masks and the crimp ratio were measured based on JIS L 1015 (2010). $Weaving volume] 1 〇 Non-woven fabric is cut to a size of 100 mm x l 〇〇 mm, and the sample is placed in an overlapping manner, and the weight is measured without applying a load and is used as a non-woven fabric volume. , after volume] 323875 36 201241253 Cut the non-woven fabric into the size of l〇〇mmxl〇〇mm, and overlap the sample by 10 pieces, apply the load of 5kgf (49N) and measure the thickness after 丨 minute, and use it as compression After the volume. [Volume change rate] The volume of the nonwoven fabric to be measured and the volume after compression were calculated based on the volume change rate (%) = [(non-woven fabric volume - compressed volume) / non-woven fabric volume] χ 1 〇〇. [Surface Touch] The surface of the nonwoven fabric was touched and evaluated in accordance with the following evaluation criteria. A: Very smooth. B: A little rough. C: thick chain. [Shrinkage/cloth quality] A fiber web having a longitudinal X-horizontal width of 2 mm x 2 mm and a density of 30 g/m was produced using a roll carding machine, and the melting point of LLDPE set to constitute the first component of each fiber was used. The hot air blowing device at a temperature of l°°c was used to heat-treat i, and then the vertical and horizontal dimensions of the web after the heat treatment were measured, and the shrinkage ratio of the mesh area was determined according to the following formula.

[Number 1] Net area shrinkage ratio (%) xlOO Further, the fabric quality of the net after the heat treatment was observed and evaluated as follows based on the net area shrinkage rate of 323879 37 201241253. A: The shrinkage rate of the mesh area is less than 3%, and the surface of the mesh (the surface of the hot air) is smooth. ^Net (4) (4) The rate is 5% or less, and the surface of the net (the surface of the hot air) has a slight unevenness. C: The mesh area shrinkage rate is 5%, and the unevenness in the surface of the net (the surface of the hot air) is obvious. [Volume recovery] The non-woven fabric was cut into a size of l〇〇mmxl〇〇mm, and the sample was overlapped, and a load of 5 kgf (49 N) was applied and left for 12 hours, after which the weight was measured after removing the weight for 10 minutes. Further, the volume recovery ratio was calculated from the thickness and the non-woven fabric volume by the volume recovery ratio (%) = (thickness after weight removal/non-woven fabric volume) xl00. [Non-woven strength] The non-woven fabric transverse direction (CD direction) is used as the stretching direction.

And based on JIS L 1096 (2010) 6. 12. 1 A method (strip meth〇d), using a constant-speed tension tensile tester, with a sample width of 5 cm 'clamp spacing The tensile test was carried out under the conditions of i〇cm and tensile speed of 30±2 cra/min, and the load value at the time of cutting was measured. The properties of the fibers and nonwoven fabric obtained in each of the examples and the comparative examples are shown in Tables 1-1 to 1-3. [Table 1-1] 323879 38 201241253 Example 1 1 Γ Example 2 Example 3 Example 4 Example 5 甘 Example β Example 7 Sheath (mixed Λ in brackets) ULDPE-K95) LLDPE-K85 LLDPE-K80) LLOPE-U75) LLDPE-1(85) LLDPE-2(85j LLDPE-K85) LDP'e-!(5) LDPE-1(15&gt; LDPE-K20) LDPE-K25) LDPe-205) LOPE-1(15) LDPE-3(15) crimping performance BAAAAAA roll box folding/25th 0 16.1 15 15.5 152 15.5 15.5 15.3 Rolling 00 11.9 13.7 \4.2 tO 14.4 13.8 13.7 Rolling shrinkage 0.739 0.913 0.916 0.934 0.929 0.890 0.395 Non-woven volume (mm) 52 59 (128 ° C) 63 66 5B 65 (I28 ° C) 59 66 (123eC) 70 (1233⁄4) 52 (138 ° C) 59 (\2BX) After compression, guess ( Mm) 7.2 6.0 5.9 5.7 9.0 72 6.0 Body essence "Chemical" (90 86.2 89.8 90.Θ 91.4 89.7 88.9 89.β Surface touch (level) AAAAAAA shrinkage/cloth C 8 AABA Θ tt#Tianfu arc扪32 (62) 39 C66) 42 (67) 44 (67) 38 (66) 44(68) 39 (66) Non-woven strength (N/5co) 8.3 8.0 (1283⁄4) 7.0 5.8 8.0 7.90 303⁄4) 7.9 5.8 ( 1233⁄4) 5.30 233⁄4^ 10.5() 383⁄4) 9.8 (1383⁄4) [Table 2] Example 8 Example 9 Example 10 Implementation EXAMPLES Example 12 Example 13 Sheath (mixing ratio in parentheses) LLDPE-5(85) LLDPE-2(95) LLDPE-2(80) U_DPE-2(75) LLDPE-2(85) LU3PE-2( 8Sj LDPE-K15) LDPE-K5) LDPE-i(20) LDPE-K25) LDPE-4{15) U3PE-5(15) crimping performance A θ AAAA 棬蝻豉 (fold /25_) 15.3 15.5 15.5 15.2 15.8 15.6 Coiled 13.7 11.5 14 14 13.5 13.7 Coil ratio / crimping number 0.895 0.742 0.903 0.921 0.864 0.878 Non-woven volume (mm) 58 53 66 66 63 67 Volume after shrinking Odd) 6.1 7.3 6.0 6.0 7.0 6.0 «Product change ( X) 89.5 86.2 90.9 90.9 of .9 91.0 Surface contact (grade) AAAAAA Shrinkage/cloth quality BCAAAA Body essence recovery (mm) (X in brackets) 40 (69) 33 (62) 45 (68) 44 (67 48 (76) 46 (69) Non-woven strength (N/5cn) 8.1 8,3 λ0 5.6 7.9 7.9 [Table 1-3] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Sheath ( In the brackets, the ratio is )) ιηαρρΕ-ι&lt;;ι〇〇) UDPE-2 (10)) —*··_Χ·_·Ι ·»—_&gt;»······«····*« ·· LLDPE-3(1〇〇) LLDPE-3(85) LDPE-1(15) LtDPE-4(85) LDPEHdS) JHDEiUSeL. C a AACB Number of crimps (folded / 25mm) 17 15.3 15.3 15 16.8 15 Volume shrinkage (3⁄4) 11.3 12.3 t3.7 13.8 10.8 12.8 Shrinkage ratio / crimping number 0.665 0.804 0.895 0.920 0.643 0.853 Non-woven fabric hoarding (mm) 35(1283⁄4) 48 58 85 25 50 370233⁄4) 30(1383⁄4) Volume after shrinkage (mm) 7.2 8.3 9.2 8.S 5.8 11 Volume change (X) 79.4 82.7 84.1 86.9 76.8 78.0 Surface touch (level) A Β CC 8 C Shrinkage / Cloth B θ BACB Male Reply _0 (X in brackets) 21 (60) 31 (65) 39 (67) 44(68) 14 (55) 33 (66) Non-woven strength (N /5cn) 8.9(128°C&gt; d.5 9.8 12 10 4.4(1233⁄4) 11.7(1383⁄4) As shown in Table 1-1 to Table 1-3, the composite staple fiber composed of a linear polyethylene only Or a composite of 39 323879 201241253 short fibers made of high-density polyethylene (Comparative Examples 1 to 3, 6) which have a small volume change rate and a poor flexibility in the thickness direction. The surface of the non-woven fabric formed by the composite short fibers is not pleasant to the touch. Further, when a linear low-density polyethylene having a density of less than 0.90 g/cm3 or more than 0.94 g/cm3 is used, even if it is mixed with low-density polyethylene and constitutes a composite short fiber, the non-woven fabric produced therefrom cannot be imparted. Good surface feel (Comparative Example 4), or bulkiness and volume recovery rate did not show satisfactory characteristics (Comparative Example 5). The composite short fibers which are composed of a linear low-density polyethylene having a density in the range of 9090g/cm3 to 0.94g/cm3 and a low-density polyethylene to form a sheath component are made of a non-woven fabric made of the composite short fibers. Further, the thickness direction showed good flexibility (small volume change rate) (Examples 1 to 13). In the first and ninth embodiments, since the mixing ratio of the low-density polyethylene is small, the evaluation of the shrinkability/quality of the fabric is low, but the other characteristics are excellent, and it can be sufficiently practical depending on the application. Comparing Example 6 with Comparative Example 2, it was found that the addition of low-density polyethylene not only imparts bulkiness, flexibility in the thickness direction, but also improves the surface feel of the nonwoven fabric. This indicates that low density polyethylene has a function as a soft component for improving the touch of a relatively high density linear polyethylene. In order to confirm the effect of the non-woven fabric of Example 5 as a surface material, the following method was used to measure the nonwoven fabric aspiration and liquid passage performance. [Run-off] (1) The non-woven fabric was cut into a longitudinal direction (mechanical direction) x a horizontal square of 18 cm x 7 cm, and used as a sample. 323879 40 201241253 (2) On the support table with a bevel that has a longitudinal angle of 45 degrees to the horizontal plane and a slightly vertical isosceles triangle, the first four sheets of Japanese paper crecia Co., Ltd. are stacked. KIMT〇WEL (registered trademark), and a fixed nonwoven sample is placed thereon. (3) From the position of the upper end 丨 (10) of the non-woven surface, read the wafer (10) (4) such as a pump or a burette to drop a total of 6 g of physiological saline at a rate of 1 g / 丨〇 sec, so that the injected physiological saline is absorbed into the non-woven fabric. And measuring the position where the water droplets of the physiological saline disappeared from the surface of the non-woven fabric, and the distance between the position and the surface of the non-woven fabric of the physiological saline solution was dropped, and the water droplets of the physiological saline solution flowed on the surface of the non-woven fabric. [The liquid absorption rate, the liquid residual amount, and the reverse flow rate] (1) In order to measure the liquid absorption rate, the liquid residual amount, and the reverse flow rate, the following items 0 absorber: KIMT0WEL (registered trademark) 2 sets were prepared. Attached to the plate of the injection cylinder (the inner diameter of the lower part of the cylinder is 1 cm). Artificial menstrual blood (viscosity 8 MPa · s).遽 paper (Dongyang Filter Paper Co., Ltd. 胄卿面^ registered trademark) No. 2) lOcmxlOcm. Weight (5kg, 287gx2). (2) Method Weight The liquid absorption speed, the liquid residual amount, and the reverse flow rate were measured in the following order. (1) A non-woven fabric sample was placed on the KIMTGWEL (registered trademark) 2 group, and a flat plate with an injection cylinder was placed thereon, and 283 879 201241253 (i i) was placed at both ends of the flat plate to inject artificial menstrual blood 5 m 1 from the cylinder. At this time, the time (absorption time) until the artificial menstrual blood could not be seen on the surface of the non-woven fabric (the artificial menstrual blood of the liquid could not be confirmed) was measured and used as the liquid absorption speed. (iii) Remove the plate and let stand for 10 minutes. (iv) After 10 minutes, the non-woven fabric is clamped with filter paper (8 pieces), and the residual artificial blood of the non-woven fabric is sucked on the filter paper to measure the quality of the filter paper (the difference between the quality of the filter paper before absorbing artificial menstrual blood and the filter paper after absorbing artificial menstrual blood is equivalent to Liquid residue). (v) Put the non-woven fabric back on the absorbent body, place a new filter paper (8 pieces) on the non-woven fabric and place it at a weight of 5 kg for 10 seconds. Then, the quality of the filter paper was measured (the difference between the quality of the filter paper placed on the non-woven fabric and the filter paper placed on the non-woven fabric and weighted was equivalent to the reverse flow rate). (vi) Go back to the above (i) and perform the second measurement. The measured liquid absorption rate, liquid residual amount, and reverse flow rate are shown in Table 2 〇 [Table 2] First Time 2nd Density Overflow Suction Speed Liquid Residual Quantity Reverse Flow Absorption Speed Liquid Residual Quantity Reverse Flow [g /m2] (mm) [sec] [g] [g] [sec] [g] [g] 28.6 21 3. 38 0. 75 0.34 3.80 0.90 0.47 As shown in Table 2, the non-woven fabric of Example 5 has been artificially The function of the menstrual blood and the absorbent body absorbed therein can be applied to the surface material of the sanitary article in view of the liquid residual amount and the liquid reverse flow rate. [Evaluation of surface characteristics and compression characteristics by KES] 323879 42 201241253 The fibers obtained in Examples 2 and 6 and Comparative Examples 1 and 6 were respectively used, and a fiber web having a density of about 50 g/m 2 was produced by a roll carding machine. The melting point is set to be 1 高 higher than the melting point of LLDPE or HDPE constituting the first component of each fiber. (: Example 2: 128 ° C, Example 6: 130 ° C, Comparative Example 1: 128 ° C, Comparative Example 6: 140 ° C) hot air blowing device, heat treatment of the obtained fiber web for 1 minute The first component is melted 'and heat is obtained and then non-woven. In order to evaluate the surface touch and the softness, bulkiness, and volume recovery (elasticity) of the heat and the thickness of the non-woven fabric, KES (KaWabata Evaluation System) (Measurement and evaluation of surface characteristics and compression characteristics for specific use. Specifically, in order to evaluate surface characteristics, heat is applied to the surface friction of the nonwoven fabric, and the average friction coefficient (MIU) and average friction as surface characteristic values are measured. Coefficient of variation (_). For the surface friction of heat and non-woven fabrics, the measurement system is used. ^(4). KES-SE motor-testing machine manufactured by K.K. Co., Ltd. The surface of the hot air blown when the heat is produced and then the non-woven fabric is measured. The surface is applied with a static load on the friction element. For example, the frictional force is moved in the direction of the transverse direction of the parallel non-woven fabric at a moving speed of 1 mm/sec, and the heat is applied immediately after the non-woven fabric, Μ, Μ MD. The heat then follows the shrinkage characteristic of the non-woven fabric, and the specific heat is then woven into the rod and pressed into the road. The relationship is measured for the sex value, and the compression hard yield is determined (LC; the weight-displacement curve is used as the compression special (10), (the load is 0.5gf/ The thickness of the cra2 when the thickness of the two-piece t-shirt is), the weight of the compression sister is 5Qgf/cm2 _ characteristic value: fixed = wide and then non-woven 32W9 KES-G5 43 201241253 HANDY compression testing machine. In the measurement, a circular pressure plate having an area of 2 cm 2 was used as a compressor to set SENS: 2. DEF sensitivity: 2 〇, and the above-mentioned ink condensed body was compressed for heat and then non-woven at a compression speed of 0.02 cm/sec. The compression was carried out until the load was 50 gf/cm2. After the load reached 5 〇gf/cm2, the compression was removed so that the moving speed of the compressed object was 〇·〇2 cm/sec, and the compression characteristic value was measured. The measurement results are shown in Table 3. [Table 3] Example 2 Example 6 Comparative Example 1 Comparative Example 6 Density (g/m2) 50.5 51.6 51.1 51.1 Specific volume (cm3/g) 73.8 72.4 64.0 73.0 Average friction coefficient (MIU) 0.418 0.368 0. 280 0.292 Average Variation of friction coefficient (MMD) 0.0146 0.0143 0.0168 0.017 8 Compression hardness (LC) 0. 504 &quot;Τ57Γ 0.677 0.647 Compressive hardness per unit density (g/m2) 0.010 0.011 0.013 0.013 Compressive energy (WC gf . cm/cm2) 5.121 5. 707 4.318 5.078 Compressive elastic energy (RC %) 60.2 59.8 59.0 56.3 Initial load (0. Sgf/cmD thickness (T〇mm) 4.97 4. 97 3.68 4.67 Upper limit load (50gf/cra〇 thickness (Τ»除) 0. 898 1.131 1.531 Compression ratio (EMC=100 *(T〇-T«)/Td %) 81.9 79.5 69.3 67.2 In the results of the surface characteristics and compression characteristics of KES shown in Table 3, if the compression characteristics of Example 2 and Example 6 and Comparative Example 6 were compared, The non-woven fabrics of Examples 2 and 6 were smaller than Comparative Example 6, and the RC and EMC were larger than those of Comparative Example 6. This is the first component of the remarkable crimped composite staple fiber used in Examples 2 and 6, and it contains a linear polyethylene having a bending elastic modulus lower than that of high-density polyethylene as a resin component. By using a linear polyethylene, it is possible to obtain a heat which is small in LC and which is soft to be deformed by the load, and then is not woven. In addition, it is considered that since the bending elastic modulus of the linear polyethylene is small, the load deformation is larger for 323879 44 201241253, so the EMC will become a significant crimping composite short fiber &lt; σ % % 'containing the present invention The load will be softly deformed and will not be woven for the thickness direction. In addition, the first to third has a heat of (four) sensation. + Ht is known as a composition containing a large amount of linear polyethylene = a crimped composite short fiber, and the heat composed of the remarkable coiled composite short fiber is followed by Non-woven fabric (including Comparative Example (10) = RC is larger than Comparative Example 6', so the linear polyethylene itself is more elastic than the higher density polyethylene, so it is presumed to be an elastic resin. If the nonwoven fabric of Comparative Example 2 and Example 6 is compared In the non-woven fabric of Comparative Example i, it is considered that the non-woven fabric of Comparative Example 1 has the same value as that of Example 6 because of the influence of only linear polyethylene. However, the non-woven fabric of Comparative Example J is not only large in LC but also WC and EMC. In the second and sixth embodiments, the non-woven fabric of Comparative Example 1 has a smaller volume than that of the non-woven fabric, which is small in size and large in density in the initial stage. Therefore, it is presumed to be a non-woven fabric which is hard to be deformed in the thickness direction and has no soft feeling. The non-woven fabric of 6 and the non-woven fabrics of Comparative Examples 1 and 6 have the MIU of the non-woven fabric surface sliding difficulty, and the non-woven fabric surface is difficult to slide. On the other hand, the non-woven fabric surface roughness is indicated. The MMD is smaller than the non-woven fabrics of Examples 2 and 6. From the results, the first component satisfies the resin composition of the direct-bonded polyethylene and the low-density polyethylene in a specific density range, and the crimping compound is short. The fiber, the non-woven fabric using the crimped composite short fiber, has a large MIU on the surface of the non-woven fabric but a small MMD. Therefore, the non-woven fabric has a moderate friction with the skin, so when it comes into contact with the skin, there is friction between the skin and the non-woven fabric and 323879 45 201241253 The feeling of attaching the non-woven fabric to the skin is small, but the change in friction is small, that is, it does not cause coarse sugar, so the touch is smooth and gives a unique feeling of touch (smoothness and moist feeling). Comparative Example 1 and Comparative Example The average friction coefficient of the 6 non-woven fabric is 1) large. The MMD, that is, the roughness of the surface of the non-woven fabric is less affected by the surface of the fiber constituting the surface of the kraft fabric, and the difficulty of the fiber movement (deformation difficulty) of the friction of the skin and the friction test on the non-woven surface is also affected. Therefore, it is considered that the more difficult the fiber is to be deformed, the more difficult it is for the fibers of the surface to move toward the muscles and the friction. Therefore, the force required to move the fibers by the skin and the frictional particles becomes large. Comparative Example 6 is a composition of the second component of the shrinking pleated staple fiber, and a high-density polyethylene having a large flexural modulus to form a fiber that is difficult to deform. Therefore, it is presumed to move the skin and rub. The force of the child will increase in an instant, and the MMD will become larger. In addition, in the comparative example (the non-woven fabric constitutes the first straight-bonded poly (four) of the remarkable crimped composite short fibers of the non-woven fabric, the push-made fiber itself is easy to change the texture, but the non-woven fabric is smaller than the volume (in other words, If the density is large, = =, so the number of fibers constituting the surface of the residual cloth will increase the muscle 2 friction when it is 'non-woven with the example W (the specific volume is smaller than the Γ Γ In the case of the skin, the sensation of the skin is increased, and the _ will become large. The force required for the friction (industry availability) The remarkable crimped composite staple fiber of the present invention (especially high-speed combing property) is excellent as When it is not woven, it can give 323879 201241253 good surface feel, bulkiness, thickness direction flexibility and volume recovery. Therefore, the remarkable crimped composite staple fiber of the present invention is particularly suitable for forming a surface material for sanitary articles, and is also suitable for Other fibrous products, such as wet wipes, wipes, cosmetic materials, cushions for women's underwear, shoulder pads, shock absorbers for vehicles, base materials for floor heating floors, cushioning materials, and packaging materials. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a fiber cross section of a substantially crimpable composite short fiber in an embodiment of the present invention. Figs. 2A to C are views showing a crimping of a composite crimped short staple fiber in an embodiment of the present invention. Fig. 3 is a view showing a conventional mechanical crimping type. Fig. 4 is a view showing a crimped form of a significantly crimpable composite short fiber in another embodiment of the present invention. [Description of main components] 1 First component 2 The second component 3 is the center of gravity in the fiber cross section of the second component. 4 The center of gravity in the fiber cross section of the composite staple fiber. The radius of the fiber cross section of the composite staple fiber. 10 Composite staple fiber 323879 47

Claims (1)

201241253 VII. Patent application scope: 1. A significantly crimped composite short fiber, which is a composite short fiber containing a first component and a second component, wherein the first component contains a density of 0.90 g/cm3 to 0.94 g/cm3. a chain-like polyethylene and a low-density polyethylene; and the first component is such that the low-density polyethylene accounts for 5% by mass to 25% by mass of the total mass of the linear polyethylene and the low-density polyethylene a low-density polyethylene; the second component contains 50% by mass or more of a polyester having a melting point higher than a melting point of a linear polyethylene constituting the first component by 40 ° C or more; At least 20% of the surface of the fiber, the center of gravity of the second component is offset from the center of gravity of the fiber; and the composite staple fiber has at least one crimp selected by wave-shaped crimping and helical crimping. 2. The substantially crimpable composite staple fiber according to claim 1, wherein the linear polyethylene is a metallocene catalyst polymerizer. 3. The substantially crimpable composite staple fiber according to claim 1 or 2, wherein the melting point of the linear polyethylene before spinning is higher than the melting point of the low-density polyethylene before spinning. 4. The substantially crimpable composite short fiber according to any one of claims 1 to 3, wherein the number and volume of the composite short fibers are measured based on JIS L 1015 (2010) In the case of the reduction ratio, the ratio of the crimp ratio to the number of crimps (the crimp ratio/volume number) is 1.2 or less. 323879 201241253 '5 A method for producing a composite short fiber' is a method for producing a composite short fiber comprising a first component and a second component, comprising: 1 having a density of 0.9 〇g/cm3 to 〇. 94g/cm3 The direct-bonded poly(ethylene), the olefin, and the low-density polyethylene are classified as 'the low-density polyethylene, and the first component of the total mass of the direct-bonded polyethylene and the low-density polyethylene is 5% by mass to 25% by mass. And a second component of the polyester containing 50% by mass or more of a melting point higher than a melting point of the direct-bonded polyethylene constituting the first component by 40 ° C or more, wherein the first component accounts for at least the fiber surface in the fiber cross section 20%, the position of the center of gravity of the second component is melt-spun in a manner away from the center of gravity of the fiber, and the spinning filament is obtained; the spinning filament is at Tg2 ° C to 95 ° C (but the second component of the Tgz system) The temperature extension in the range of the glass transition point of the polymer component having the highest glass transition point in the polymer component is 1.8 to 5 times; for the filament after stretching, the number of crimping is 5 peaks / 25 mm to 25 Volume / 25min range gives mechanical crimping, from 50 to 115 Annealing is performed at a temperature within the range of c; 1 to the annealed filament is cut to a length of 1 mm to 100 mm; and the composite fin fiber has at least one type of crimp selected by wave-shaped crimping and spiral crimping . A fiber-like aggregate comprising a remarkable crimped composite staple fiber according to any one of items 1 to 4 of the above-mentioned patent application. The blister assembly of claim 6, wherein the fibers are thermally bonded to each other by the first component of the substantially crimpable composite short fibers. 8. A surface material for a sanitary article, which is formed by a fiber assembly as described in claim 6 or 7. 9. A sanitary article comprising the surface material of claim 8 of the patent application. 323879