JP2013155476A - Blended filament nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blended filament nonwoven fabric excellent in bulkiness, flexibility, form stability, delamination resistance, lint free property and hand.SOLUTION: A blended filament nonwoven fabric comprises a blend of actual crimped filaments having more than 10 crimps/25 mm and non-crimped filaments, preferably the blended filament nonwoven fabric comprising the blend of 30-95 wt.% of the actual crimped filaments with 70-5 wt.% of the non-crimped filaments.

Description

  The present invention relates to a mixed fiber continuous fiber nonwoven fabric excellent in bulkiness, flexibility, form stability, delamination resistance and texture.

  In recent years, nonwoven fabrics are widely used for various applications because of their excellent breathability and flexibility. For this reason, the nonwoven fabric is required to have various properties according to its use and to improve the properties.

  For example, non-woven fabrics used for sanitary materials such as disposable diapers and sanitary napkins, and base fabrics for poultices are required to have water resistance and excellent moisture permeability. Moreover, it is requested | required that it should be extensible depending on the location used.

  In order to improve the texture and feel of the nonwoven fabric, it is effective to make the nonwoven fabric bulky, and one of the methods is to use a core-sheath type or parallel type composite fiber using different polymers. Thus, many methods for causing crimping to the fibers constituting the nonwoven fabric have been proposed.

  For example, a method using a parallel type composite fiber having a hollow part in which at least two component resins having a melting point difference of 15 ° C. or more are joined in parallel (Patent Document 1; Japanese Patent Laid-Open No. 10-110372), a different type of propylene polymer A method using a hollow composite fiber has been proposed, such as a method using a hollow continuous multicomponent fiber (Patent Document 2; JP 2002-529617 A).

  And in the examples of these patent documents, examples using hollow composite fibers having two components of 50/50 are described. Patent Document 2 also proposes a hollow composite fiber (FIG. 3D) in which the hollow portion is eccentric.

  Although these proposed methods can also provide crimped composite fibers, non-woven fabrics made of crimped fibers are bulky and flexible, so that when nonwoven fabrics are used to process diapers and sanitary products, nonwoven fabrics are used. May be easily stretched at low stress and may lack morphological stability.

  Also, a method of mixing a crimped short fiber and a non-crimped short fiber to form a bulky nonwoven fabric (Patent Document 3: Japanese Patent Application Laid-Open No. 2007-39835), or a nonwoven fabric obtained by mixing a composite long fiber and a non-composite long fiber A method of heat-treating and crimping the composite long fiber after the point fusion (Patent Document 4: JP-A-5-195406), a bulky nonwoven fabric composed of crimped parallel composite spun long fibers, and A method of laminating a non-bulk nonwoven fabric made of non-crimped thermoplastic resin long fibers (Patent Document 5: Japanese Patent Laid-Open No. 7-197367) has also been proposed.

  However, non-woven fabrics mixed with short fibers tend to fall off during processing or use, and non-composite long fibers may be bent and non-composite long fibers may be bent in heat-treated non-woven fabrics. Since a laminate of a long fiber nonwoven fabric and a non-crimped long fiber nonwoven fabric tends to cause delamination and has different characteristics on the front and back sides, product design may be difficult.

Japanese Patent Laid-Open No. 10-110372 JP-T-2002-529617 JP 2007-39835 A JP-A-5-195406 JP-A-7-197367

  An object of the present invention is to develop a mixed fiber continuous fiber nonwoven fabric excellent in bulkiness, flexibility, form stability, delamination resistance, lint-free property, and texture.

  The present invention is a mixed fiber long-fiber nonwoven fabric obtained by mixing an actual crimped long fiber having a number of crimps of 10 pieces / 25 mm or more and a non-crimped long fiber, preferably 30 to 95% by weight of the actual crimped long fiber. The present invention provides a mixed fiber long-fiber nonwoven fabric containing 70 to 5% by weight of non-crimped long fibers.

  The mixed fiber long-fiber nonwoven fabric of the present invention is excellent in bulkiness, flexibility, form stability, delamination resistance, lint-free property, and texture. Moreover, the manufacturing method of the mixed fiber continuous fiber nonwoven fabric of this invention can manufacture the mixed fiber continuous fiber nonwoven fabric which has the said characteristic easily.

FIG. 1 is a schematic view of a spunbonding apparatus used in Examples and Comparative Examples of the present invention. FIG. 2 is a conceptual diagram showing the nozzle pitch of the spinning die used in the example of the present invention. The white painted portion and the black painted portion represent different discharge hole shapes. FIG. 3 is a schematic view showing a cross section of the crimped composite continuous fiber used in the example of the present invention. In the figure, the white and black portions represent the resins to be combined. FIG. 4 is a schematic view showing a cross section of the hollow composite long fiber used in the example of the present invention. In the figure, the white and black portions represent the resins to be combined. FIG. 5 is a schematic view showing the hole shape of the base for a hollow composite long fiber used in the example of the present invention. In the figure, the white and black portions represent the resins to be combined. FIG. 6 is a schematic diagram showing the hole shape of the eccentric hollow composite long fiber cap used in the examples of the present invention. Six forms of FIGS. 6-1 to 6-6 are listed. In the figure, the white and black portions represent the resins to be combined, a represents the thickness of the high melting point thermoplastic resin (A), and b represents the thickness of the high melting point thermoplastic resin (B). FIG. 7 is a schematic view showing an example of a cross section of a hollow eccentric composite long fiber used in an example of the present invention. In the examples of the present invention, the high melting point resin (A) was discharged from a portion having a narrow slit width.

<Thermoplastic resin>
The thermoplastic resin constituting the actual crimped long fiber and the non-crimped long fiber of the mixed fiber long-fiber nonwoven fabric according to the present invention may be various known thermoplastic resins as long as it can be spun, specifically, For example, a high-pressure low-density polyethylene or a linear low-density polyethylene which is a homopolymer or copolymer of α-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene ( So-called LLDPE), ethylene polymers such as high density polyethylene, polypropylene (propylene homopolymer), propylene polymers such as propylene / α-olefin random copolymer, poly 1-butene, poly 4-methyl-1- Pentene, ethylene / propylene random copolymer, ethylene / 1-butene random copolymer, propylene / 1-butene random copolymer Olefin polymers such as polyester, polyethylene (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, polymetaxylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene Examples thereof include vinyl acetate copolymer, polyacrylonitrile, polycarbonate, polystyrene, ionomer, and mixtures thereof. Of these, ethylene polymers, propylene polymers, polyesters, polyamides and the like are preferable.

The molecular weight of the thermoplastic resin is not particularly limited as long as it has a molecular weight enough to melt and fiberize.
The thermoplastic resin according to the present invention includes generally used antioxidants, weathering stabilizers, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments and the like as long as the object of the present invention is not impaired. These additives or other polymers can be blended as required.

<High melting point thermoplastic resin (A)>
The high melting point thermoplastic resin (A) constituting the actual crimped composite long fiber which is one of the actual crimped long fibers according to the present invention is a resin selected from the thermoplastic resins, and is a low melting point thermoplastic resin. It is a thermoplastic resin having a melting point of 5 ° C. or more, preferably 10 ° C. or more higher than the melting point or softening temperature of (B).

  In the present application, the difference between the melting point of the high-melting point thermoplastic resin (A) and the melting point or softening point of the low-melting point thermoplastic resin (B) is collectively referred to as the melting point difference, but from the viewpoint of fiber strength. Is preferably a combination of thermoplastic resins in which the difference between the melting point of (A) and the melting point of (B) is 5 ° C. or higher, and the difference in the melting point of (A) and (B) is 10 ° C. or higher. A combination of resins is more preferable.

  Among the high melting point thermoplastic resins (A), depending on the combination with the low melting point thermoplastic resin (B), the propylene homopolymer having a melting point of 158 ° C. or higher, further 159 to 165 ° C. or a small amount of propylene and a small amount, A propylene polymer such as a copolymer with 1% by weight or less of an α-olefin such as ethylene, 1-butene, 1-hexene and 1-octene is preferable, and a propylene homopolymer is particularly preferable.

  The melting point of the high melting point thermoplastic resin (A) according to the present invention is determined from the temperature that gives the extreme value of the melting endothermic curve when the temperature is raised at a rate of 10 ° C./min using a differential scanning calorimeter (DSC). The temperature is raised to a temperature as high as about 50 ° C., held at this temperature for 10 minutes, and then cooled down to 30 ° C. at a rate of temperature decrease of 10 ° C./min. The melting curve when warmed was measured, and the temperature (Tp) giving the extreme value of the melting endothermic curve was determined from the melting curve according to the method of ASTM D3418-99, and the endothermic peak at this peak temperature was taken as the melting point.

<Low melting point thermoplastic resin (B)>
The low melting point thermoplastic resin (B) constituting the actual crimped composite long fiber which is one of the actual crimped long fibers according to the present invention is a resin selected from the thermoplastic resins, and is a high melting point thermoplastic resin. It is a thermoplastic resin having a melting point or softening point lower than the melting point of (A) by 5 ° C. or more, preferably 10 ° C. or more.

  The low melting point thermoplastic resin (B) according to the present invention is necessarily a crystalline thermoplastic resin as long as it is 5 ° C. or more lower than the melting point or softening point of the high melting point thermoplastic resin (A). There is no.

  Among the low melting point thermoplastic resins (B), although depending on the combination with the high melting point thermoplastic resin (A), the melting point is 153 ° C. or lower, and further 125 to 150 ° C. propylene and ethylene, 1-butene, 1 Random copolymers with α-olefins such as -hexene and 1-octene are preferred.

  The melting point and softening point of the low-melting point thermoplastic resin (B) according to the present invention are the extreme values of the melting endothermic curve when the temperature is raised at a rate of temperature increase of 10 ° C./min using a differential scanning calorimeter (DSC). The temperature is raised to a temperature about 50 ° C. higher than the applied temperature, held at this temperature for 10 minutes, then cooled down to 30 ° C. at a rate of temperature decrease of 10 ° C./min, and again at a predetermined rate of 10 ° C./min The melting curve is measured when the temperature is raised to the temperature, and the temperature (Tp) giving the extreme value of the melting endothermic curve is obtained from the melting curve according to the method of ASTM D3418-99, and the endothermic peak of the peak temperature is determined as the melting point. And the softening point.

<Actual crimped long fiber>
The actual crimped long fiber constituting the mixed fiber continuous fiber nonwoven fabric of the present invention is a fiber that is crimped by cooling after melt spinning of the thermoplastic resin, and usually has a number of crimps of 10 pieces / 25 mm or more. , Preferably 15/25 mm or more, more preferably 20/25 mm or more.

The actual crimped staple fibers according to the present invention usually have a fiber diameter in the range of 0.5 to 5.0 d, preferably 0.5 to 3.0 d.
The actual crimped long fiber according to the present invention is a long fiber that is crimped by melt spinning and cooling a single polymer selected from the thermoplastic resin that is a raw material of the mixed fiber long-fiber nonwoven fabric. For example, a crimped fiber that is imparted with crimp by applying mechanical stress, a crimped fiber that has been crimped by spinning and then heat-treated, or a crimped fiber that has been crimped by spinning and spinning, etc. It is not a crimped fiber that is crimped by post-processing.

  The actual crimped staple fibers using a single thermoplastic resin are, for example, a method of applying cooling air at different temperatures from the left and right or front and rear when cooling the melt-spun yarn, or by applying cooling air from one side. Examples of the actual crimped long fiber that has been crimped by cooling the melt-spun yarn by forming the actual crimped long fiber, the modified cross-section fiber or the eccentric hollow fiber that has been crimped. .

  Eccentric core-sheath composite long fiber, parallel type (side-by-side type) composite long fiber in which different thermoplastic resins having different crystallization temperatures or melting points, softening points, crystallization speeds, melt viscosities, etc. are combined from the thermoplastic resin, Examples include actual crimped long fibers such as hollow composite long fibers and eccentric hollow composite long fibers that have been crimped by causing distortion in the fibers during cooling.

  Among these apparently crimped long fibers, the actual crimped composite long fibers are preferable because they can provide the actual crimped long fibers having excellent crimpability. Particularly, the actual crimped eccentric hollow composite long fibers are the most crimpable. It is preferable because it is rich.

<Parallel-type actual crimped composite filament>
The parallel-type actualized crimped composite long fiber, which is one of the actualized crimped composite long fibers according to the present invention, preferably contains a high-melting point thermoplastic resin (A) having a melting point difference of 5 ° C. or higher, ( The ratio of the part A) to the part comprising the low-melting point thermoplastic resin (B), the part (B) is 5/95 to 95/5 (weight ratio), more preferably 5/95 to 50/50 (weight). Ratio), more preferably 5/95 to 30/70 (weight ratio).

In the case of the parallel type composite continuous fiber in which the ratio of the high melting point thermoplastic resin (A) is outside the above range, there is a possibility that the actual crimped continuous fiber having high crimpability cannot be obtained only by cooling the melt-spun yarn. is there.
In addition, the portion (A) part comprising the high-melting point thermoplastic resin (A) in the parallel-type actual crimped composite long fiber is not limited to the purpose of the present invention, and the thermoplastic resin other than (A), crystal Agents, pigments and the like may be included. Examples of the thermoplastic resin other than (A) include high-density polyethylene. When higher bulkiness is desired, it is preferable that high-density polyethylene is included because crimpability is further improved.

Similarly, the portion (B) containing the low-melting point thermoplastic resin (B) contains a thermoplastic resin other than (B), a crystallization agent, a pigment and the like within a range not impairing the object of the present invention. You may go out.
Further, from the viewpoint of bulkiness, in the fiber cross section (the cross section cut perpendicularly to the fiber axis direction is simply referred to as “fiber cross section”. In the present specification, the same applies hereinafter), the fiber cross section with respect to the entire outer circumference. The ratio of the length of the outer periphery occupied by the part (A) is preferably less than 50%, more preferably less than 40%, and still more preferably less than 30%.

<Parallel type actual crimped hollow composite continuous fiber>
The side-by-side actual crimped hollow composite long fiber, which is one of the composite long fibers according to the present invention, is preferably composed of at least two-component thermoplastic resin having a melting point difference of 5 ° C. or higher, and is a high melting point thermoplastic resin (A). Part to low melting point thermoplastic resin (B) part is 5/95 to 95/5 (weight ratio), more preferably 5/95 to 50/50 (weight ratio), still more preferably 5/95 to 30 / It is a parallel-type actual crimped hollow composite continuous fiber in the range of 70 (weight ratio).

  Side-by-side manifest crimped hollow composite long fibers in which the proportion of the high melting point thermoplastic resin (A) is outside the above range can be obtained by cooling the melt-spun yarn to obtain a manifest crimped long fiber having excellent crimp properties. There is a risk of not being able to.

  In addition, in the part (A) part containing the high-melting point thermoplastic resin (A) in the side-by-side manifest crimped hollow composite long fiber, a thermoplastic resin other than (A) is within the range not impairing the object of the present invention, It may contain a crystallization agent, a pigment and the like. Examples of the thermoplastic resin other than (A) include high-density polyethylene. When higher bulkiness is desired, it is preferable that high-density polyethylene is included because crimpability is further improved.

Similarly, the portion (B) containing the low-melting point thermoplastic resin (B) contains a thermoplastic resin other than (B), a crystallization agent, a pigment and the like within a range not impairing the object of the present invention. You may go out.
Furthermore, from the viewpoint of bulkiness, in the fiber cross section, the ratio of the outer peripheral length occupied by the (A) portion to the entire outer peripheral length of the fiber cross section is preferably less than 50%, more preferably less than 40%, and even more preferably 30%. Is less than.

<Parallel type actual crimped eccentric hollow composite continuous fiber>
The parallel-type actualized crimped eccentric hollow composite continuous fiber according to the present invention is preferably composed of at least two-component thermoplastic resin having a melting point difference of 5 ° C. or more, and includes a high-melting-point thermoplastic resin (A) portion and a low-melting-point thermoplastic resin. The ratio of the resin (B) part is 5/95 to 95/5 (weight ratio), more preferably 5/95 to 50/50 (weight ratio), still more preferably 5/95 to 30/70 (weight ratio). It is a parallel type actual crimp crimped eccentric hollow composite long fiber in the range.

  The parallel-type actualized crimped eccentric hollow composite long fiber in which the proportion of the high melting point thermoplastic resin (A) part is outside the above range is the actual crimped long fiber which is rich in crimp by simply cooling the melt-spun yarn. May not be obtained.

  In addition, the thermoplastic resin other than (A) is included in the part (A) part containing the high melting point thermoplastic resin (A) in the parallel-type actualized crimped eccentric hollow composite long fiber as long as the object of the present invention is not impaired. Resins, crystallization agents, pigments and the like may be included. Examples of the thermoplastic resin other than (A) include high-density polyethylene. When higher bulkiness is desired, it is preferable that high-density polyethylene is included because crimpability is further improved.

Similarly, the portion (B) containing the low-melting point thermoplastic resin (B) contains a thermoplastic resin other than (B), a crystallization agent, a pigment and the like within a range not impairing the object of the present invention. You may go out.
Furthermore, from the viewpoint of bulkiness, in the fiber cross section, the ratio of the outer peripheral length occupied by the (A) portion to the entire outer peripheral length of the fiber cross section is preferably less than 50%, more preferably less than 40%, and even more preferably 30%. Is less than.

  Among the parallel-type actualized crimped eccentric hollow composite continuous fibers according to the present invention, high melting point thermoplastic resin (A): 5 to 30% by weight, preferably 10 to 25% by weight, and low melting point thermoplastic resin (B): 95 to 70% by weight, preferably 90 to 75% by weight, the hollow part is eccentric to the high melting point thermoplastic resin (A) side, and the thickness (a) of the part (A) is low melting point heat. The side-by-side manifest crimped eccentric hollow composite continuous fiber having a thickness smaller than the thickness (b) of the plastic resin (B) part has the most crimpability.

  The thickness (a) of the high melting point thermoplastic resin (A) part in the present invention is the longest distance from the hollow outer periphery to the outer periphery of the fiber cross section, and the thickness (a) of the part (A) is used. The thickness (b) of the plastic resin (B) portion is the longest distance from the hollow outer periphery to the outer periphery of the fiber cross section in the (B) portion in the cross section of the eccentric hollow composite fiber. ).

<Non-crimped long fiber>
The non-crimped long fibers constituting the mixed fiber long-fiber nonwoven fabric of the present invention are long fibers that do not cause crimping even when cooled after being melt-spun of the thermoplastic resin.
The non-crimped long fibers according to the present invention usually have a fiber diameter in the range of 0.5 to 5.0 d, preferably 0.5 to 3.0 d.

  The thermoplastic resin used for the non-crimped long fiber is not particularly limited as long as it is a thermoplastic resin that does not cause crimping even when cooled after being melt-spun, but an ethylene polymer, a propylene polymer, polyester, polyamide, etc. In particular, when the composite crimped long fiber is mixed with a composite long fiber such as a parallel-type composite long fiber, a parallel-type hollow composite long-fiber, or a parallel-type eccentric hollow composite long-fiber, the height of the composite long-fiber It is preferable to use the same thermoplastic resin as the melting point thermoplastic resin (A) or a thermoplastic resin containing (A).

<Mixed fiber non-woven fabric>
The mixed fiber long fiber nonwoven fabric of the present invention is a long fiber nonwoven fabric obtained by mixing the actual crimped long fiber and the non-crimped long fiber.

  The non-crimped long-fiber nonwoven fabric of the present invention exists in a state where non-crimped long fibers are intricately entangled with the crimped fibers in the mixed-fiber long-fiber nonwoven fabric. Since non-crimped fibers entangled with the fibers are restrained, it has excellent shape stability and lint-free properties, and has better delamination resistance than a laminate of actual crimped long fibers and non-crimped long fibers. Excellent in properties and texture.

  On the other hand, a non-crimped long fiber is a non-crimped long fiber because a non-crimped long fiber and a non-crimped long fiber are heat-treated to develop crimps. Will fold. Therefore, since the non-crimped long fiber is bent in the non-woven fabric in which the crimp is expressed, the effect of suppressing the expansion and contraction of the crimped long fiber is inferior, and the form stability is insufficient.

  The ratio of the actual crimped long fiber and the non-crimped long fiber in the mixed fiber continuous fiber nonwoven fabric of the present invention can be selected according to the use of the mixed fiber continuous fiber nonwoven fabric. For example, for applications such as filters and sound-absorbing materials that emphasize bulkiness, flexibility, and texture, for example, wiper and paper diapers that emphasize the morphological stability and lint-free properties by increasing the proportion of the actual crimped long fibers. In the case of surface materials such as backsheets, so-called female materials (landing zones) in so-called open-type disposable diapers, the ratio of the visible crimped long fibers may be reduced.

  The mixed fiber continuous fiber non-woven fabric of the present invention is preferably 30 to 95% by weight of actual crimped long fiber, more preferably 50 to 95% by weight, still more preferably 60 to 95% by weight, and preferably non-crimped long fiber. It is contained in the range of 70 to 5% by weight, more preferably 50 to 5% by weight, still more preferably 30 to 5% by weight (the total amount of the actual crimped long fibers and the non-crimped long fibers is 100% by weight). By this, it becomes a mixed-fiber continuous fiber nonwoven fabric excellent in especially bulkiness, a softness | flexibility, form stability, delamination-proof property, lint free property, and the balance of texture.

  Further, for example, for applications such as filters and sound-absorbing materials that place importance on bulkiness, flexibility and texture, preferably 40 to 75% by weight of actual crimped long fibers, preferably 60 to 25% of non-crimped long fibers. For surface materials for wipers and diapers where weight%, shape stability, and lint-free properties are important, preferably 25-60% by weight of actual crimped long fibers, preferably 75-40% by weight of non-crimped long fibers It becomes a mixed fiber continuous fiber nonwoven fabric suitable for a use by including in the range of%.

The mixed fiber continuous fiber nonwoven fabric of the present invention preferably has a basis weight of 3 to 200 g / m ² , preferably 10 to 150 g / m ² .
The mixed fiber long-fiber nonwoven fabric of the present invention is usually bulky, specifically mixed, depending on the combination of the actual crimped long fibers and the non-crimped long fibers and the production conditions of the mixed fiber long-fiber nonwoven fabric. A value obtained by dividing the thickness (mm) of the filament long-fiber nonwoven fabric by the basis weight (g / m ² ) is in the range of 0.01 to 0.04 mm / (g / m ² ).

  The mixed filament long-fiber nonwoven fabric of the present invention uses various known entanglement methods, for example, a method using a needle punch, water jet, ultrasonic wave, or the like, or hot embossing using an embossing roll or hot air through. It may be entangled by a method in which one part is heat-sealed. Such entanglement methods may be used singly or in combination with a plurality of entanglement methods, but thermal embossing is excellent in form stability, and a high-strength mixed fiber continuous fiber nonwoven fabric is obtained.

If heat sealing by the heat embossing is usually 5-40% embossed area ratio, preferably 5-25%, the non-embossed unit area is 0.5 mm ² or more, preferably in the range of 4 to 40 mm ² . The non-embossed unit area is the maximum area of a quadrilateral inscribed in the embossed portion in the smallest unit of the non-embossed portion surrounded on all four sides by the embossed portion. By having the embossing in such a range, a strong nonwoven fabric can be obtained without inhibiting the bulkiness of the crimped fiber.
The mixed fiber continuous fiber nonwoven fabric of the present invention may be used alone or laminated with other layers depending on various uses. Moreover, the mixed fiber continuous fiber nonwoven fabric of the present invention can be printed.

<Mixed fiber non-woven fabric laminate>
The mixed fiber continuous fiber nonwoven fabric of the present invention is obtained by laminating with various layers depending on applications.
Specifically, a knitted fabric, a woven fabric, a nonwoven fabric, a film, etc. can be mentioned, for example. When laminating (bonding) the mixed filament long-fiber nonwoven fabric of the present invention and other layers, thermal embossing, thermal fusion methods such as ultrasonic fusion, mechanical entanglement methods such as needle punch and water jet, hot Various known methods such as a method using an adhesive such as a melt adhesive and a urethane-based adhesive, extrusion lamination, and the like can be adopted.

  Examples of the nonwoven fabric laminated with the mixed fiber continuous fiber nonwoven fabric of the present invention include various known nonwoven fabrics such as spunbond nonwoven fabric, melt blown nonwoven fabric, wet nonwoven fabric, dry nonwoven fabric, dry pulp nonwoven fabric, flash spun nonwoven fabric, and spread nonwoven fabric. it can.

  Examples of the material constituting such a nonwoven fabric include various known thermoplastic resins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. High pressure low density polyethylene, linear low density polyethylene (so-called LLDPE), high density polyethylene, polypropylene, polypropylene random copolymer, poly 1-butene, poly 4-methyl-1-pentene, ethylene / propylene random Polyolefin such as copolymer, ethylene / 1-butene random copolymer, propylene / 1-butene random copolymer, polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon- 66, poly Data xylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene-vinyl acetate copolymer, polyacrylonitrile, polycarbonate can be exemplified polystyrene, ionomers, thermoplastic polyurethane, or mixtures thereof. Among these, high pressure method low density polyethylene, linear low density polyethylene (so-called LLDPE), high density polyethylene, polypropylene, polypropylene random copolymer, polyethylene terephthalate, polyamide and the like are preferable.

As a preferable aspect of the laminated body using the mixed fiber long-fiber nonwoven fabric of the present invention, ultrafine fibers (fineness: 0.8 to 2.5 denier, more preferably 0.8 to 1.5 are manufactured by a spunbond method. And a laminate of a spunbond nonwoven fabric and / or a meltblown nonwoven fabric made of denier. Specifically, two layers of spunbond nonwoven fabric (ultrafine fiber) / mixed fiber long fiber nonwoven fabric, melt blown nonwoven fabric / mixed fiber long fiber nonwoven fabric, etc., spunbond nonwoven fabric (ultrafine fiber) / mixed fiber long fiber nonwoven fabric / spunbond nonwoven fabric ( 3 layers such as ultrafine fiber), spunbond nonwoven fabric (ultrafine fiber) / mixed filament long fiber nonwoven fabric / melt blown nonwoven fabric, spunbond nonwoven fabric (ultrafine fiber) / melt blown nonwoven fabric / mixed filament long fiber nonwoven fabric, or spunbond nonwoven fabric (ultrafine fiber) / Mixed fiber long fiber nonwoven fabric / Melt blown nonwoven fabric / Spunbond nonwoven fabric (ultrafine fiber), Spunbond nonwoven fabric (ultrafine fiber) / Mixed fiber long fiber nonwoven fabric / Melt blown nonwoven fabric / Mixed fiber long fiber nonwoven fabric / Spunbond nonwoven fabric (ultrafine fiber) A laminate of four or more layers is exemplified. The basis weight of the nonwoven fabric of each layer to be laminated is preferably in the range of ^{2 to} 25 g / m ² . The spunbond nonwoven fabric composed of the above ultrafine fibers can be obtained by controlling (selecting) the production conditions of the spunbond method. Such a mixed fiber long-fiber nonwoven fabric laminate is a laminate in which the bulkiness and flexibility of the mixed fiber long-fiber nonwoven fabric of the present invention are utilized, the surface is excellent in smoothness, and the water resistance is improved.

The film laminated with the mixed fiber continuous fiber nonwoven fabric of the present invention is preferably a gas permeable (moisture permeable) film that takes advantage of the air permeability characteristic of the mixed fiber continuous fiber nonwoven fabric of the present invention. Examples of such a breathable film include various known breathable films, for example, films made of thermoplastic elastomers such as moisture-permeable polyurethane elastomers, polyester elastomers, polyamide elastomers, and thermoplastic resins containing inorganic or organic fine particles. Examples thereof include a porous film formed by stretching a film to be porous. The thermoplastic resin used for the porous film is preferably a polyolefin such as high-pressure method low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, polypropylene random copolymer, or a composition thereof.
A laminate with a breathable film can be a cross-like composite material that takes advantage of the bulkiness and flexibility of the blended long-fiber nonwoven fabric of the present invention and has extremely high water resistance.

<Manufacturing method of mixed fiber long-fiber nonwoven fabric>
The mixed fiber continuous fiber nonwoven fabric of the present invention is obtained by using a spunbonded nonwoven fabric manufacturing apparatus and a thermoplastic resin melted from a composite spinning nozzle provided with a spinneret for actual crimped long fibers and a spinneret for non-crimped long fibers. The composite long fiber and the long fiber are spun by discharging, and the spun mixed fiber is cooled by cooling air, and the composite long fiber and the long fiber mixed by high-speed air are pulled and thinned to have a predetermined fineness. In addition, after crimping the composite long fiber, collecting it on a collecting belt and depositing it on a predetermined thickness (weight), if necessary, needle punch, water jet, ultrasonic wave, etc. A manifestation method characterized by being entangled by a entanglement method such as a method using a means, a heat embossing process using an embossing roll, or a method of heat fusing part 1 by using hot air through The long fibers and a non-crimped Chijimicho fibers is a method of obtaining the mixed-fiber filament nonwoven fabric formed by mixed fiber.

  When the same thermoplastic resin as the high melting point thermoplastic resin (A), which is one of the components of the composite long fiber, is used as the thermoplastic resin forming the non-crimped long fiber, a branch is provided at the tip of the extruder. The molten resin may be sent to the spinneret for actual crimped long fibers and the spinneret for non-crimped long fibers.

<Paper diapers>
The paper diaper of the present invention comprises the mixed fiber long-fiber nonwoven fabric of the present invention or a mixed fiber long-fiber nonwoven fabric laminate comprising the mixed fiber long-fiber nonwoven fabric of the present invention, a surface material of a paper diaper, a side gather, a back sheet, It becomes a member such as a top sheet and a waist member.

<Sanitary napkin>
The sanitary napkin of the present invention comprises the mixed fiber long-fiber nonwoven fabric of the present invention or a mixed fiber long-fiber nonwoven fabric laminate including the mixed fiber long-fiber nonwoven fabric of the present invention. It becomes a member such as a back sheet and a top sheet.

EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.
In addition, the physical property of the mixed fiber long-fiber nonwoven fabric obtained by the Example and the comparative example was performed with the following method.

(1) Number of crimps (pieces / 25mm)
A dividing line having a spatial distance of 25 mm was previously made on a piece of paper having a smooth surface and gloss. Next, each of the apparently crimped long fibers carefully collected so as not to impair the crimpability from the non-woven long fiber nonwoven fabric before being heated and pressurized by the embossing roll, 25 ± Both ends were attached to the paper piece with an adhesive and fixed with 5% looseness. One sample at a time, attached to the grip of the crimping tester, cut the piece of paper, and then the distance between the grips when the initial load (0.18 mN x number of tex) is applied to the sample (spatial distance) ( mm). The number of crimps at that time was counted, and the number of crimps per 25 mm was obtained. The number of crimps was obtained by counting all the peaks and valleys and dividing by 2 to obtain the number of crimps.

  As for the number of crimps, only the actual crimped long fibers were taken out from the mixed filament long-fiber nonwoven fabric, 20 fibers were measured, and the average value obtained up to one decimal point was defined as the number of crimps. The number of crimps was measured in a temperature-controlled room at a temperature of 20 ± 2 ° C. and a humidity of 65 ± 2% as defined in JIS Z8703 (standard condition at the test site).

(2) Lint-free properties When measuring the strength in the MD direction in a temperature-controlled room with a temperature of 20 ± 2 ° C and a humidity of 65 ± 2% as specified in JIS Z8703 (standard state of the test place), the flow direction from the mixed fiber long-fiber nonwoven fabric When three specimens of 11 cm in (MD) and 4 cm in the transverse direction (CD) are collected and the strength in the CD direction is measured, 11 cm in the transverse direction (CD) and the flow direction (MD ) Three 4 cm test pieces are collected.

  Next, a double-sided tape (ST-416P, manufactured by Sumitomo 3M) is attached to the non-measurement surface of the collected test piece, and the double-sided tape is further peeled off, and the test piece is pasted on the measurement plate. In order to fix the test piece, a weight (size: 5 × 15 × 3.8 cm, weight: 2200 g) is allowed to stand on the test piece for 20 seconds. After 20 seconds, the weight was removed, and a sandpaper (Metalite K-224-505) was attached to the friction part at the top of the measurement plate, and the test piece and the friction part were in contact under a constant load (load value 0.91 kg). In this state, the test piece is reciprocated 20 times at a constant speed (42 reciprocations / minute) up and down in the longitudinal direction.

  After reciprocating 20 times, the friction part is removed, cut into a size of 4 cm x 11 cm in advance, and a single-sided tape (Scotch mark surface protection tape, manufactured by Sumitomo 3M Co.) whose weight (previous weight) has been measured is applied to the test piece, and the weight is placed on the test piece. (Size: 5 × 15 × 3.8 cm, Weight: 2200 g) is allowed to stand for 20 seconds.

After 20 seconds, the weight was removed, the tape was removed from the test piece, and the lint-free property was evaluated from the state of the tape with the dropped fibers attached.
○: Adhesion of fibers to the tape was hardly observed.
X: The fiber adhered to the tape very much.

(3) Morphological stability 26cm in the flow direction (MD) in the flow direction (MD) in a constant temperature room with a temperature of 20 ± 2 ° C and a humidity of 65 ± 2% specified in JIS Z8703 (standard state of the test place) 3 pieces of 13 cm specimens were collected on a CD), and the load was 4 kgf using a tensile tester (Instron 5564, manufactured by Instron Japan Ltd.) under conditions of 210 mm between chucks and 50 mm / min. A tensile test was conducted to the extent that the shape stability was evaluated from the deformation amount of the length in the CD direction at the center in the MD direction.
○: No obvious deformation was observed.
X: Obvious deformation was observed.

(4) Delamination resistance The test piece was cut out from the mixed fiber long fiber nonwoven fabric into a strip shape having a width of 25 mm. A part of the test piece was peeled from the nonwoven fabric layer in the longitudinal direction, and the peeled ends were attached to a jig of a testing machine (Model 2005 model manufactured by Intesco) in a T-shape so that the chuck distance was 50 mm (180 Degree peeling). The nonwoven fabric layer was peeled at a peeling speed of 100 mm / min in an atmosphere of 23 ° C. and a relative humidity of 50%, and the peel strength (unit: g / 25 mm) between the mixed fiber long-fiber nonwoven fabrics was measured.

(5) Texture 10 evaluators evaluated the touch on the embossed surface and the non-embossed surface of the mixed fiber long-fiber nonwoven fabric. The evaluation results are shown according to the following criteria.
◎: When 10 people out of 10 feel that the touch is good,
○: If there are 9 to 7 people out of 10
Δ: When 6 to 3 out of 10 people feel that the touch is good,
X: When the number of people who feel that the touch is good is 2 or less out of 10 people.

[Example 1]
Propylene polymer [melting point (Tmo): 157 ° C.] with a load of 2160 g as a high melting point thermoplastic resin (A) and MFR at 230 ° C. of 60 g / 10 min, and a load of 2160 g, 230 as a low melting point thermoplastic resin (B). A propylene / ethylene random copolymer (Mw / Mn = 2.4, melting point (Tmo); 143 ° C., ethylene content; 4 mol%) having an MFR of 60 g / 10 min. 2), the nozzle arrangement pattern as shown in FIG. 2 is used, and either one of the two nozzles schematically shown in white and black in FIG. A spinneret having a cross section was arranged. Then, it was produced using a nonwoven fabric production apparatus (spun bond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 100 mm) as shown in FIG. More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. A web comprising a mixed fiber including a parallel-type crimped composite continuous fiber having a ratio of the thermoplastic resin (B) of 20/80 (% by weight) and a non-crimped continuous fiber comprising only the high-melting point thermoplastic resin (A). Was adjusted so that the blend ratio (parallel crimped continuous fiber and non-crimped continuous fiber) was 50% by weight: 50% by weight, and was deposited on the collection surface.

  That is, in this example, a mixed fiber long-fiber non-woven fabric was manufactured using a non-woven fabric manufacturing apparatus as shown in FIG. 1 that can be spun simultaneously using two different types of resins. In the nonwoven fabric manufacturing apparatus shown in FIG. 1, nozzles are arranged as shown in FIG.

  In FIG. 1, number 1 is the first extruder, number 1 ′ is the second extruder, and different types of resins are used for the first extruder and the second extruder. In FIG. 1, number 2 is a spinneret, number 3 is a continuous filament, number 4 is cooling air, number 5 is an ejector, number 6 is a catching device, number 7 is a suction device, number 8 is a web. Reference numeral 9 is a winding roll, and in FIG. 2, reference numerals 11 and 12 are spunbond nonwoven melt spinning nozzles, and different types of resins are discharged from the nozzles 11 and 12.

  The spinneret has a nozzle arrangement pattern as shown in FIG. 2, has a nozzle diameter of 0.6 mmφ, a nozzle pitch of 8 mm in the vertical direction and 9 mm in the horizontal direction, and the ratio of the number of nozzles is a parallel crimped composite. Long fiber nozzle: non-crimped long fiber nozzle = 1: 1. The single-hole discharge rate of the parallel crimped continuous fibers was 0.6 g / (min · hole), and the single-hole discharge rate of non-crimped long fibers was 0.6 g / (min · hole).

The deposited web was embossed at 125 ° C. (embossed area ratio 20.6%, embossed roll diameter 150 mmφ, marking pitch: longitudinal and transverse 2.1 mm, marking shape: rhombus), and the basis weight was 25 g / m ² A mixed long fiber nonwoven fabric was produced. (The ratio of the length of the outer circumference occupied by the portion (A) to the entire outer circumference of the fiber cross section was 35%.)
The physical properties of the obtained mixed filament long-fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

[Example 2]
Propylene polymer [melting point (Tmo): 157 ° C.] with a load of 2160 g as a high melting point thermoplastic resin (A) and MFR at 230 ° C. of 60 g / 10 min, and a load of 2160 g, 230 as a low melting point thermoplastic resin (B). A propylene / ethylene random copolymer (Mw / Mn = 2.4, melting point (Tmo); 143 ° C., ethylene content; 4 mol%) having an MFR of 60 g / 10 min. 2), one of the two nozzles schematically shown in white and black in FIG. 2 is designed to have a hole shape as shown in FIG. The spinneret was arranged as shown in FIG. Then, it was produced using a nonwoven fabric production apparatus (spun bond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 100 mm) as shown in FIG. More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. It includes concentric actual crimped hollow composite long fibers composed of a thermoplastic resin (B) ratio of 20/80 (% by weight) and non-crimped long fibers composed only of a high melting point thermoplastic resin (A). A web made of mixed fibers was adjusted so that the mixing ratio of the actual crimped hollow composite long fibers and the non-crimped long fibers was 50% by weight: 50% by weight, and was deposited on the collection surface.

  That is, in this example, a mixed fiber long-fiber non-woven fabric was manufactured using a non-woven fabric manufacturing apparatus as shown in FIG. 1 that can be spun simultaneously using two different types of resins. In the nonwoven fabric manufacturing apparatus shown in FIG. 1, nozzles are arranged as shown in FIG.

  The spinneret has a nozzle arrangement pattern as shown in FIG. 2, the nozzle pitch is 8 mm in the vertical direction and 9 mm in the horizontal direction, and the ratio of the number of nozzles is the nozzle for the actual crimped hollow composite long fiber: non-crimped Long fiber nozzle = 1: 1. The single hole discharge rate of the actual crimped hollow composite long fiber was 0.6 g / (minute / hole), and the single hole discharge amount of the non-crimped long fiber was 0.6 g / (minute / hole).

The deposited web was embossed at 125 ° C. (embossed area ratio 20.6%, embossed roll diameter 150 mmφ, marking pitch: longitudinal and transverse 2.1 mm, marking shape: rhombus), and the basis weight was 25 g / m ² A mixed long fiber nonwoven fabric was produced. (The ratio of the length of the outer circumference occupied by the portion (A) to the entire outer circumference of the fiber cross section was 35%.)
The physical properties of the obtained mixed filament long-fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

Example 3
Propylene polymer [melting point (Tmo): 157 ° C.] with a load of 2160 g as a high melting point thermoplastic resin (A) and MFR at 230 ° C. of 60 g / 10 min, and a load of 2160 g, 230 as a low melting point thermoplastic resin (B). A propylene / ethylene random copolymer (Mw / Mn = 2.4, melting point (Tmo); 143 ° C., ethylene content; 4 mol%) having an MFR of 60 g / 10 min. 2), one of the two nozzles schematically shown in white and black in FIG. 2 is designed to have a hole shape as shown in FIG. The spinneret was arranged so that the figure became FIG. Then, it was produced using a nonwoven fabric production apparatus (spun bond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 100 mm) as shown in FIG. More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. From a mixed fiber comprising an actual crimped eccentric hollow composite continuous fiber having a ratio of the thermoplastic resin (B) of 20/80 (% by weight) and a non-crimped continuous fiber composed only of the high melting point thermoplastic resin (A) The web was adjusted so that the blend ratio of the actual crimped eccentric hollow composite long fiber and the non-crimped long fiber was 50% by weight: 50% by weight, and was deposited on the collection surface.

  That is, in this example, a mixed fiber long-fiber non-woven fabric was manufactured using a non-woven fabric manufacturing apparatus as shown in FIG. 1 that can be spun simultaneously using two different types of resins. In the nonwoven fabric manufacturing apparatus shown in FIG. 1, nozzles are arranged as shown in FIG.

  The spinneret has a nozzle arrangement pattern as shown in FIG. 2, the nozzle pitch is 8 mm in the vertical direction and 9 mm in the horizontal direction, and the ratio of the number of nozzles is the nozzle for the apparently crimped eccentric hollow composite long fiber: Crimped long fiber nozzle = 1: 1. The single hole discharge rate of the actual crimped eccentric hollow composite long fiber was 0.6 g / (minute / hole), and the single hole discharge amount of the non-crimped long fiber was 0.6 g / (minute / hole).

The deposited web was embossed at 125 ° C. (embossed area ratio 20.6%, embossed roll diameter 150 mmφ, marking pitch: longitudinal and transverse 2.1 mm, marking shape: rhombus), and the basis weight was 25 g / m ² A mixed long fiber nonwoven fabric was produced. (The ratio of the length of the outer circumference occupied by the portion (A) to the entire outer circumference of the fiber cross section was 35%.)
The physical properties of the obtained mixed filament long-fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

[Comparative Example 1]
Propylene polymer [melting point (Tmo): 157 ° C.] with a load of 2160 g as a high melting point thermoplastic resin (A) and MFR at 230 ° C. of 60 g / 10 min, and a load of 2160 g, 230 as a low melting point thermoplastic resin (B). A propylene / ethylene random copolymer (Mw / Mn = 2.4, melting point (Tmo); 143 ° C., ethylene content; 4 mol%) having an MFR of 60 g / 10 min. ), And a non-woven fabric manufacturing apparatus (spun bond forming machine, length in a direction perpendicular to the flow direction of the machine on the collecting surface) in which the spinneret is arranged so that the fiber cross section of FIG. 3 is obtained. , 100 mm). More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. The thermoplastic resin (B) was deposited on a collecting surface made of actual crimped composite long fibers having a ratio of 20/80 (% by weight).

The spinneret had a nozzle diameter of 0.6 mmφ, the nozzle pitch was 8 mm in the vertical direction and 9 mm in the horizontal direction, and the single-hole discharge rate was 0.6 g / (min / hole).
The deposited web was embossed at 125 ° C. (embossed area ratio 20.6%, embossed roll diameter 150 mmφ, marking pitch: longitudinal and transverse 2.1 mm, marking shape: rhombus), and the basis weight was 25 g / m ² A long-fiber non-woven fabric consisting only of the actual crimped composite long fibers was produced.
The physical properties of the obtained long fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

[Comparative Example 2]
After being melted using a propylene polymer (melting point (Tmo); 157 ° C.) having a load of 2160 g and an MFR at 230 ° C. of 60 g / 10 min as a high melting point thermoplastic resin (A) using an extruder (30 mmφ) 1, the nonwoven fabric production apparatus (spun bond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 100 mm) in which the spinneret is arranged so that the non-crimped long fibers are discharged. Manufactured. More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. Crimped long fibers were deposited on the collection surface.

The spinneret had a nozzle diameter of 0.6 mmφ, the nozzle pitch was 8 mm in the vertical direction and 9 mm in the horizontal direction, and the single-hole discharge rate was 0.6 g / (min / hole).
The deposited web was embossed at 125 ° C. (embossing area ratio 20.6%, embossing roll diameter 150 mmφ, marking pitch: vertical and horizontal 2.1 mm, marking shape: rhombus), and the basis weight was 25 g / m ² A spunbond nonwoven was produced.
The physical properties of the obtained long fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

[Comparative Example 3]
<Manufacture of actual crimped composite long fiber nonwoven fabric>
Propylene polymer [melting point (Tmo): 157 ° C.] with a load of 2160 g as a high melting point thermoplastic resin (A) and MFR at 230 ° C. of 60 g / 10 min, and a load of 2160 g, 230 as a low melting point thermoplastic resin (B). A propylene / ethylene random copolymer (Mw / Mn = 2.4, melting point (Tmo); 143 ° C., ethylene content; 4 mol%) having an MFR of 60 g / 10 min. ), And a non-woven fabric manufacturing apparatus (spun bond forming machine, length in a direction perpendicular to the flow direction of the machine on the collecting surface) in which the spinneret is arranged so that the fiber cross section of FIG. 3 is obtained. , 100 mm). More specifically, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., and the stretched air wind speed is 2000 m / min. Deposited on a collecting surface composed of crimped composite long fibers having a ratio of thermoplastic resin (B) of 20/80 (% by weight) to produce an apparently crimped composite long nonwoven fabric having a basis weight of 12.5 g / m ² did.
The spinneret had a nozzle diameter of 0.6 mmφ, the nozzle pitch was 8 mm in the vertical direction and 9 mm in the horizontal direction, and the single-hole discharge rate was 0.6 g / (min / hole).

<Manufacture of non-crimped long-fiber nonwoven fabric>
After using a propylene polymer (melting point (Tmo): 157 ° C.) having a load of 2160 g and an MFR at 230 ° C. of 60 g / 10 min as the high-melting point thermoplastic resin (A), melting using an extruder (30 mmφ), A non-woven fabric manufacturing apparatus (spunbond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 100 mm) in which a spinneret that discharges non-crimped fibers is arranged is shown in FIG. Used, the resin temperature and the die temperature are both 210 ° C., the cooling air temperature is 25 ° C., the stretched air wind speed is 2000 m / min. Fibers were deposited on the collecting surface to produce a non-crimped composite length nonwoven fabric having a basis weight of 12.5 g / m ² .
The spinneret had a nozzle diameter of 0.6 mmφ, the nozzle pitch was 8 mm in the vertical direction and 9 mm in the horizontal direction, and the single-hole discharge rate was 0.6 g / (min / hole).

<Lamination of actual crimped composite long fiber nonwoven fabric and non-crimped long fiber nonwoven fabric>
The actual crimped composite continuous fiber nonwoven fabric and the non-crimped continuous fiber nonwoven fabric were laminated and embossed at 125 ° C. (embossed area ratio 20.6%, embossed roll diameter 150 mmφ, stamping pitch: longitudinal and lateral 2.1 mm) A spunbonded nonwoven fabric with a basis weight of 25 g / m ² was manufactured.
The physical properties of the obtained long fiber nonwoven fabric were measured by the method described above. The measurement results are shown in Table 1.

  In addition to being bulky, the long fiber nonwoven fabric made of the eccentric hollow composite fiber of the present invention is excellent in lint-free property and shape stability. For this reason, it is preferably used for sanitary materials such as disposable diapers and sanitary napkins, wiping cloths, and the like, and since it is flexible and has a good texture, bedding such as medical and surgical clothes, packaging cloth, bed sheets, pillow covers, etc. It can be widely used for carpets and fabrics for artificial leather, industrial materials, civil engineering and construction, agricultural and horticultural materials, and life-related materials.

DESCRIPTION OF SYMBOLS 1 1st extruder 1 '2nd extruder 2 Spinneret 3 Continuous filament (long fiber)

Claims (10)

  A mixed fiber long-fiber nonwoven fabric obtained by mixing actual crimped long fibers having a number of crimps of 10 pieces / 25 mm or more and non-crimped long fibers.   The mixed fiber continuous fiber nonwoven fabric according to claim 1, wherein the actual crimped long fiber is an actual crimped long fiber obtained by melt spinning and cooling a thermoplastic resin.   The mixed fiber continuous fiber nonwoven fabric according to claim 1, comprising 30 to 95% by weight of actual crimped long fibers and 70 to 5% by weight of non-crimped long fibers.   The mixed crimped long-fiber nonwoven fabric according to any one of claims 1 to 3, wherein the actual crimped continuous fiber is an actual crimped composite continuous fiber.   The mixed fiber continuous fiber nonwoven fabric according to claim 4, wherein the actual crimped composite long fiber is an actual crimped hollow composite long fiber.   6. The mixed fiber continuous fiber nonwoven fabric according to claim 5, wherein the actual crimped hollow composite long fiber is an actual crimped eccentric hollow composite long fiber.   A portion in which the actual crimped composite long fiber includes a high-melting point thermoplastic resin (A) and a low-melting point thermoplastic resin (B) having a melting point difference of 5 ° C. or more, and a high-melting point thermoplastic resin (A) It is a parallel-type manifest crimped composite long fiber in which the ratio of the (A) part and the part (B) part comprising the low-melting point thermoplastic resin (B) is in the range of 5/95 to 30/70 (weight ratio). The mixed filament long-fiber nonwoven fabric according to claim 4.   The actual crimped hollow composite continuous fiber includes a high melting point thermoplastic resin (A) having a melting point difference of 5 ° C. or more and a low melting point thermoplastic resin (B), and includes the high melting point thermoplastic resin (A). Side-by-side manifest crimped hollow composite long fibers in which the ratio of the part (A) part to the part (B) part comprising the low-melting point thermoplastic resin (B) is in the range of 5/95 to 30/70 (weight ratio) The mixed fiber continuous fiber nonwoven fabric according to claim 5.   The actual crimped eccentric hollow composite long fiber includes a high melting point thermoplastic resin (A) and a low melting point thermoplastic resin (B) having a melting point difference of 5 ° C. or more, and also includes a high melting point thermoplastic resin (A). The ratio of the part (A) part consisting of and the part (B) part containing the low-melting point thermoplastic resin (B) is in the range of 5/95 to 30/70 (weight ratio). The mixed fiber continuous fiber nonwoven fabric according to claim 6, which is a hollow composite continuous fiber.   The ratio [a / b] of the thickness (a) of the part (A) and the thickness (b) of the part (B) in the cross-section of the side-by-side manifest crimped eccentric hollow composite fiber is 0.1 to 0.9. The mixed-fiber continuous fiber nonwoven fabric according to claim 9, which is in a range.

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