JP2016183430A - Elastic nonwoven fabric of long filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric having elasticity and flexibility, with advantages such as dimensional stability, strength, and good appearance.SOLUTION: An elastic nonwoven fabric of long filaments mainly composed of low-crystalline polypropylene which are arranged in the longitudinal direction in a stretched state. The long filaments have a fiber diameter of 5 to 15 μm, and the stretching factor is 1.1 to 7.SELECTED DRAWING: None

Description

  The present invention relates to a stretchable long-fiber nonwoven fabric and a method for producing the same. The present invention particularly relates to a stretchable long-fiber nonwoven fabric excellent in stretchability and flexibility and a method for producing the same.

  2. Description of the Related Art Conventionally, a longitudinally-aligned long-fiber non-woven fabric in which long-filament filaments made of polyethylene terephthalate are highly aligned in the longitudinal direction has been known (for example, Patent Document 1). Also known is a transversely-aligned long-fiber nonwoven fabric in which long-fiber filaments made of polyethylene terephthalate are highly laterally arranged (for example, Patent Document 2), and an orthogonal long-fiber nonwoven fabric in which these are laminated is also known. ing.

JP 2001-140159 Japanese Patent Laid-Open No. 2002-249969

  The invention disclosed in Patent Documents 1 and 2 has been commercialized using long fiber filaments made of polyethylene terephthalate. These products have the great advantage that they are small in elongation due to external force, excellent in dimensional stability, and have excellent strength and appearance. On the other hand, longitudinally aligned long fiber nonwoven fabrics, laterally aligned long fiber nonwoven fabrics, and orthogonal long fiber nonwoven fabrics made of polyethylene terephthalate are sometimes difficult to deform depending on the application. There has been a demand for imparting stretchability and flexibility while maintaining advantages such as dimensional stability, strength, and appearance.

In view of the above-mentioned problems, the present invention is a stretchable long-fiber nonwoven fabric, in which long-fiber filaments mainly composed of low crystalline polypropylene are arranged in one direction, and stretched in the direction of the arrangement, The long fiber filament is a filament having a fiber diameter of 5 to 15 μm, and the draw ratio is 1.1 to 7 times.
In the stretchable long-fiber nonwoven fabric, the low crystalline polypropylene is preferably atactic polypropylene having a melt flow rate of 50 to 2000 g / 10 min.

The stretchable long-fiber nonwoven fabric preferably has an elongation rate in the direction of the array of 1 to 20%.
The stretchable long-fiber nonwoven fabric preferably has an elongation recovery rate in the direction of the array of 80 to 100%.

In another aspect, the present invention is a laminate, comprising a first fiber layer made of the stretchable long-fiber nonwoven fabric described in any of the above, and a second fiber layer, wherein the first A laminated body obtained by laminating the fiber layer and the second fiber layer and heat-sealing them,
The second fiber layer is
a) The stretchable long-fiber nonwoven fabric according to any one of the above, wherein the stretchable long-fiber nonwoven fabric is substantially perpendicular to the first fiber layer and the fiber arrangement direction,
b) A long-fiber nonwoven fabric in which long fiber filaments mainly composed of non-low crystalline polypropylene are arranged in one direction and stretched in the direction of the arrangement, and the arrangement direction of the first fiber layer and the fibers is A non-woven fabric that is substantially orthogonal,
c) one or more fiber layers selected from a network structure;
The network structure is
1) A split fiber film obtained by splitting a uniaxially stretched multilayer film along the stretching direction and widening in a direction perpendicular to the stretching direction. 2) A slit is formed along the unidirectional direction in the multilayer film, and uniaxial in the direction. Stretched network film 3) Split fiber nonwoven fabric obtained by laminating the split fiber film of 1) above so that the stretch direction is orthogonal 4) Split fiber film of 1) and the net film of 2) 5) Nonwoven fabric obtained by laminating uniaxially stretched multilayer tapes so that they intersect each other 6) Woven fabric obtained by weaving uniaxially stretched multilayer tapes so that they intersect each other Cloth 7) It is a laminated body selected from the group which consists of arbitrary combinations which consist of 2 or more of said 1)-said 6).

  ADVANTAGE OF THE INVENTION According to this invention, the elastic | stretch long-fiber nonwoven fabric provided with a stretching property, a softness | flexibility, and a followable | trackability can be provided, maintaining the advantages, such as high intensity | strength and the outstanding external appearance.

It is a conceptual diagram which shows an example of the manufacturing apparatus for manufacturing the vertical arrangement | sequence stretchable long-fiber nonwoven fabric of this invention. It is a conceptual diagram which shows an example of the manufacturing apparatus for manufacturing the horizontal arrangement | sequence stretchable long-fiber nonwoven fabric of this invention.

  The present invention is a stretchable long fiber nonwoven fabric in which long fiber filaments mainly composed of low crystalline polypropylene are arranged in one direction and stretched in parallel to the direction of the arrangement. Here, “arranging long fiber filaments in one direction” means that the length directions of fiber groups constituting the nonwoven fabric are arranged in substantially the same direction. For example, in the case of producing a stretchable non-woven fabric as a long sheet, the specific arrangement direction is the fiber arrangement direction based on the longitudinal direction or the width direction, or the inclination of the fiber from the longitudinal direction or the width direction. It can be expressed as an angle. In one embodiment, the direction in which the long fiber filaments are arranged is the longitudinal direction of the long sheet, that is, the longitudinal direction, or the width direction of the long sheet, that is, the lateral direction. However, it may have a slight inclination angle from the vertical direction or the horizontal direction. Further, by stretching the long fiber filaments arranged in one direction in parallel to the arrangement direction, the molecules constituting the long fiber filaments are oriented in the drawing direction, that is, the direction parallel to the fiber arrangement direction.

  In the following first embodiment, the long fiber filaments are arranged so that the length direction of the long fiber filaments is generally in the longitudinal direction, and then stretched in the longitudinal direction. As a result, the molecules constituting the long fiber filaments are in the longitudinal direction. Orient. The stretchable long-fiber nonwoven fabric obtained in this manner will be described as a longitudinally-aligned stretchable long-fiber nonwoven fabric. In the following specification, the “longitudinal direction” means a machine direction, that is, a feeding direction when the nonwoven fabric according to the present invention is manufactured. In the second embodiment, the long fiber filaments are arranged so that the length direction of the long fiber filaments is generally in the transverse direction, and then stretched in the transverse direction. As a result, the molecules constituting the long fiber filaments are in the transverse direction. Oriented to The stretchable long-fiber non-woven fabric obtained in this way will be described as a laterally-aligned stretchable long-fiber non-woven fabric. The “lateral direction” means a direction perpendicular to the longitudinal direction, that is, the width direction of the nonwoven fabric. The stretchable long fiber nonwoven fabric of the present invention is not limited to the specific fiber arrangement direction described below and the long fiber filament and molecular orientation directions.

[First embodiment: Longitudinal stretch elastic fiber nonwoven fabric]
The present invention relates to a longitudinally aligned stretchable long-fiber nonwoven fabric according to the first embodiment. The longitudinally aligned stretchable long-fiber nonwoven fabric according to this embodiment is a stretchable long-fiber nonwoven fabric obtained by arranging longitudinal fiber filaments mainly composed of low crystalline polypropylene in the longitudinal direction and stretching in the longitudinal direction, The draw ratio is 1.1 to 7 times, and the fiber diameter of the long fiber filament after drawing is 5 to 15 μm.

  The long fiber filaments may be substantially long fibers, and may be those having an average length exceeding 100 mm. The fiber diameter of the long fiber filaments after stretching refers to the average diameter of the long fiber filaments in a state of becoming a nonwoven fabric after being stretched 1.1 to 7 times in the production method described later. The fiber diameter of the long fiber filament is 5 to 15 μm, and more preferably 5 to 10 μm. This is to obtain a fine appearance. The length and diameter of a filament shall mean the value measured from the enlarged micrograph.

  In the nonwoven fabric by this embodiment, it is preferable that the folding width | variety of a long fiber filament is 300 mm or more. This is because the folding width needs to be large to some extent in order for the filament to function as a long fiber. Such a folding width can be changed depending on the flow velocity of the high-speed airflow and the rotation speed of the airflow vibration mechanism in the manufacturing method described later. The folded width of the long fiber filament is the average length of the substantially straight line portion between the turning points when the spun long fiber filament is vibrated in the longitudinal direction and is folded on the conveyor. And the length observed visually in the state which became a nonwoven fabric after extending | stretching shall be said.

  The long fiber filament according to the present embodiment is mainly composed of low crystalline polypropylene. Examples of the low crystalline polypropylene include atactic polypropylene in which methyl groups of propylene units are irregularly arranged with respect to the main chain. The atactic polypropylene preferably has a melting point of 75 to 85 ° C. When the melting point is higher than 85 ° C., the stretchability may be lacking, and when it is lower than 75 ° C., the shape stability may be lacking. The atactic polypropylene has a melt flow rate of, for example, 50 to 2000 g / 10 minutes, preferably 50 to 600 g / 10 minutes. This is because the spinnability by the melt blow method is good.

  In addition to the low-crystalline polypropylene, the other component includes, for example, 1 to 50% by mass, preferably 5 to 20% by mass of polypropylene in which the methyl groups of the propylene unit are regularly arranged with respect to the main chain. It may be. By adding such polypropylene within the above range, flexibility can be lowered and rigidity can be imparted in accordance with the application and purpose. As other components, for example, additives such as antioxidants, weathering agents, and coloring agents may be included in an amount of about 0.01 to 2%.

  In the longitudinally aligned stretchable long-fiber nonwoven fabric according to this embodiment, the long-fiber filaments are aligned in the longitudinal direction and are stretched in the longitudinal direction.

  Next, this invention is demonstrated from a viewpoint of the manufacturing method of a stretchable long fiber nonwoven fabric. A method for producing a longitudinally stretchable long-fiber nonwoven fabric includes a nozzle group for extruding a large number of filaments, a conveyor for collecting and conveying the filaments extruded from the nozzle groups, and an air flow vibrating means for vibrating a high-speed air stream blown to the filaments Preparing a plurality of filaments mainly composed of low-crystalline polypropylene from the nozzle group toward the conveyor, and causing the filaments extruded from the nozzle group to accompany the high-speed air stream And the step of periodically changing the direction of the high-speed air flow in the traveling direction of the conveyor by the air flow vibrating means, thereby producing a long fiber nonwoven fabric in which filaments are arranged in the longitudinal direction, The long fiber nonwoven fabric in which the filaments are arranged in the longitudinal direction is uniaxially stretched in the traveling direction of the conveyor The Rukoto, and a step of obtaining a longitudinal array long-fiber nonwoven fabric.

  FIG. 1: is a schematic block diagram which shows an example of the longitudinally-aligned stretchable long-fiber nonwoven fabric manufacturing apparatus by the melt blow method which can be used for the manufacturing method of a longitudinally-aligned stretchable long-fiber nonwoven fabric. The non-woven fabric manufacturing apparatus shown in FIG. 1 has a spinning unit mainly composed of a melt blow die 1 and a conveyor 7, and a stretching unit composed of stretching cylinders 12a and 12b, take-up nip rollers 16a and 16b, and the like.

  In the front stage of the apparatus, a resin mainly composed of low crystalline polypropylene is charged into an extruder (not shown) with the above-mentioned predetermined composition, melted, extruded, and sent to the melt blow die 1.

  The melt blow die 1 has a large number of nozzles 3 arranged at the tip (lower end) in a direction perpendicular to the paper surface, that is, perpendicular to the traveling direction of the conveyor 7. A large number of filaments 11 are formed by extruding from the nozzle 3 the molten resin 2 mainly composed of low crystalline polypropylene fed from a gear pump (not shown). In FIG. 1, the melt blow die 1 is shown in cross section for clarity of the internal structure, and only one nozzle 3 is shown. Air reservoirs 5a and 5b are provided on both sides of each nozzle 3, respectively. High-pressure heated air heated to the melting point of the resin mainly composed of low crystalline polypropylene is fed into the air reservoirs 5a and 5b, communicates with the air reservoirs 5a and 5b, and opens at the tip of the meltblowing die 1. It is ejected from the slits 6a and 6b. As a result, a high-speed air flow substantially parallel to the extrusion direction of the filament 11 from the nozzle 3 is generated. The filament 11 extruded from the nozzle 3 is maintained in a meltable state that can be drafted by the high-speed airflow, and the filament 11 is drafted by the frictional force of the high-speed airflow, and the filament 11 is reduced in diameter. The diameter of the filament 11 immediately after spinning is preferably 30 μm or less, more preferably 25 μm or less. The mechanism described above is the same as that of a normal melt blow method. The temperature of the high-speed airflow is set to 80 ° C. or higher, preferably 120 ° C. or higher, higher than the spinning temperature of the filament 11.

  In the method of forming the filament 11 using the melt blow die 1, the temperature of the filament 11 immediately after being extruded from the nozzle 3 can be made sufficiently higher than the melting point of the filament 11 by increasing the temperature of the high-speed airflow. Therefore, the molecular orientation of the filament 11 can be reduced.

  A conveyor 7 is disposed below the meltblowing die 1. The conveyor 7 is wound around a conveyor roller 13 and other rollers that are rotated by a drive source (not shown). By driving the conveyor 7 by the rotation of the conveyor roller 13, the filament 11 extruded from the nozzle 3 is It is conveyed in the right direction in the figure.

  An elliptical airflow vibration mechanism 9 is provided in the vicinity of the melt blow die 1 in a region where high-speed airflow is generated by the slits 6a and 6b. The airflow vibration mechanism 9 is arranged so that the rotation shaft 9a is arranged substantially perpendicular to the conveying direction of the filament 11 on the conveyor 7, that is, substantially parallel to the width direction of the nonwoven fabric to be manufactured, and the rotation shaft 9a is rotated. It is rotated in the direction indicated by the arrow A about the rotation shaft 9a. As described above, by arranging the elliptical columnar airflow vibration mechanism 9 in the flow area of the high-speed airflow and rotating it, the flow direction of the filament 11 can be changed using the Coanda effect as will be described later. The number of airflow vibration mechanisms 9 is not limited to one, and a plurality of airflow vibration mechanisms 9 may be provided as necessary to increase the swing width of the filament 11.

  The filament 11 flows along a high-speed airflow that is a flow in which high-pressure heated air ejected from the slits 6 a and 6 b on both sides of the nozzle 3 is merged. The high-speed airflow flows in a direction substantially perpendicular to the transport surface of the conveyor 7 by the high-pressure heated air ejected from the slits 6 a and 6 b. By the way, when there is a wall in the vicinity of a high-speed jet of gas or liquid, it is generally that the jet tends to flow near the direction along the wall even if the direction of the jet axis and the direction of the wall are different. Are known. This is called the Coanda effect. The airflow vibration mechanism 9 changes the flow direction of the filament 11 using this Coanda effect.

  The width of the air flow vibration mechanism 9, that is, the length in the direction parallel to the rotation shaft 9 a is desirably 100 mm or more larger than the width of the filament group spun by the melt blow die 1 (see FIG. 1). If the width of the airflow vibration mechanism 9 is smaller than this, the flow direction of the high-speed airflow cannot be sufficiently changed at both ends of the filament group, and the vertical arrangement of the filaments 11 at both ends of the filament group becomes insufficient. There is a fear. Further, the distance between the peripheral wall surface 9b of the airflow vibration mechanism 9 and the airflow axis 100 of the high-speed airflow is 25 mm or less, preferably 15 mm or less at the smallest. If the distance between the airflow vibration mechanism 9 and the airflow shaft 100 is longer than this, the effect of attracting the high-speed airflow to the airflow vibration mechanism 9 is small, and the filament 11 may not be able to be sufficiently shaken.

  Further, the swing width of the filament 11 depends on the flow velocity of the high-speed airflow and the rotational speed of the airflow vibration mechanism 9. Therefore, the speed of the high-speed airflow is 10 m / sec or more, preferably 15 m / sec or more. At a speed lower than this, the airflow is not sufficiently attracted to the peripheral wall surface 9b of the airflow vibration mechanism 9, and as a result, the filament 11 may not be sufficiently shaken. The rotational speed of the airflow vibration mechanism 9 may be set such that the frequency of the peripheral wall surface 9b is the frequency that maximizes the swing width of the filament 11. Such a frequency varies depending on the spinning conditions, and can be appropriately determined by those skilled in the art.

  A spray nozzle 8 is provided between the melt blow die 1 and the conveyor 7. The spray nozzle 8 sprays mist-like water into a high-speed air current, whereby the filament 11 is cooled and rapidly solidified. Although a plurality of spray nozzles 8 are actually installed, only one nozzle nozzle 8 is shown in FIG. 1 to avoid complexity.

  The solidified filament 11 is accumulated on the conveyor 7 while being shaken in the vertical direction, and is partially folded in the vertical direction and continuously collected. The filament 11 on the conveyor 7 is conveyed to the right in the drawing by the conveyor 7, nipped between the stretching cylinder 12 a and the pressing roller 14 heated to the stretching temperature, and transferred to the stretching cylinder 12 a. Thereafter, the filament 11 is nipped between the stretching cylinder 12b and the pressing rubber roller 15 and transferred to the stretching cylinder 12b, and is in close contact with the two stretching cylinders 12a and 12b. Thus, the filament 11 is sent in close contact with the drawing cylinders 12a and 12b, so that the filament 11 becomes a web in which adjacent filaments are fused while being partially folded in the vertical direction.

  The web obtained by being in close contact with the drawing cylinders 12a and 12b is further taken up by take-up nip rollers 16a and 16b (the take-up nip roller 16b in the subsequent stage is made of rubber). The peripheral speeds of the take-up nip rollers 16a and 16b are larger than the peripheral speeds of the stretching cylinders 12a and 12b, whereby the web is stretched in the longitudinal direction.

  The draw ratio of the web varies depending on the type of filament polymer constituting the web, the spinning means and arranging means of the web, the intended longitudinal and transverse strength and elongation, and the like. A draw ratio that can be achieved is selected. In particular, the filament diameter is reduced by stretching at a higher magnification than that of a normal nonwoven fabric, whereby a fine denier nonwoven fabric is obtained, and texture and filter characteristics can be improved. In the present invention, the draw ratio is 1.1 to 7 times, preferably 2.5 to 6 times.

The draw ratio is defined by the following formula based on marks placed at a constant interval in the drawing direction on the web before drawing.
Stretch ratio = [Length between marks after stretching] / [Length between marks before stretching]
The draw ratio here does not necessarily mean the draw ratio of each filament as in the case of drawing ordinary filament filament yarns.

  Through such a drawing process, the longitudinally stretchable long-fiber nonwoven fabric 18 according to the present embodiment is obtained. The obtained longitudinally aligned stretchable long-fiber nonwoven fabric 18 may be further stretched as necessary, or may be subjected to post-treatment such as partial adhesion treatment such as heat treatment or heat embossing. As described above, in this embodiment, the alignment of the filaments is further improved by stretching the spun web in the longitudinal direction. Accordingly, the spinning means can be spun as a web made of filaments having good stretchability. For this purpose, it is necessary that the filaments are sufficiently quenched to form a web made of filaments having a low stretching stress and a high elongation. As described above, the most effective means is to spray the mist-like water from the spray nozzle 8 as described above and include the mist-like liquid in the high-speed air stream. Adding an oil agent that can impart properties such as so-called spinning / stretching oil agent and properties such as electrostatic removal to the mist-like liquid improves the subsequent extensibility and reduces fluff. Further, it is effective in that the strength and elongation after stretching can be improved. The fluid ejected from the spray nozzle 8 is not necessarily required to contain moisture or the like as long as the filament 11 can be cooled, and may be cold air.

  In addition, the manufacturing method and manufacturing apparatus demonstrated with reference to FIG. 1 are an example, Comprising: The manufacturing method of the longitudinally-aligned stretchable long-fiber nonwoven fabric which concerns on this embodiment is not limited to the said method. For example, the spinning method of the filament is not limited to the melt blow method described above, and may use a spun bond method. As the stretching means, it is preferable to use a proximity stretching method involving heating with a heat source such as infrared rays, hot air, hot water, steam, etc. at least in the first stage. From the second stage onward, stretching methods such as roll stretching, hot water stretching, steam stretching, hot plate stretching, and roll rolling can be used. As the airflow vibration mechanism, those that change the direction of the high-speed airflow by rotation and those that change the direction of the high-speed airflow by rocking are known. For example, in addition to various mechanisms disclosed in Patent Document 1, A mechanism that has a wall surface that is inclined with respect to the airflow axis 100 of the airflow and that causes the Coanda effect by simply moving the wall surface and the airflow axis 100 of the high-speed airflow in parallel may be used.

  The longitudinally aligned stretchable long-fiber nonwoven fabric according to this embodiment manufactured by the above-described manufacturing method and the manufacturing method according to the modified embodiment includes the fiber diameter and the draw ratio as described above. In addition, it has excellent stretchability and followability in the vertical direction.

  In a preferred embodiment, the longitudinally stretchable long-fiber nonwoven fabric according to this embodiment is in the fiber direction, that is, the direction of the long-fiber filaments, and the elongation in the longitudinal direction, which is the stretching direction, is 1 to 20%. Preferably, it is 5 to 15%. Such an elongation shall mean the value measured by JIS L1096 8.16.1 a) A method. In a preferred embodiment, the longitudinally stretchable long-fiber nonwoven fabric according to this embodiment has an elongation recovery rate in the longitudinal direction, which is the fiber direction, of 80 to 100%, and preferably 90 to 100%. The elongation recovery rate is a value measured by JIS L1096 8.16.2 a) A method.

  The longitudinally aligned stretchable long-fiber nonwoven fabric according to the present embodiment may have both of these elongation and elongation recovery rates, or may have one of these properties. These characteristics are clearly different from the conventional long-fiber nonwoven fabrics manufactured from polyethylene terephthalate by the same manufacturing method, and have the desired stretchability and followability.

[Second Embodiment: Horizontally Aligned Stretchable Long Fiber Nonwoven Fabric]
The present invention relates to a transversely aligned stretchable long-fiber nonwoven fabric according to the second embodiment. The transversely-aligned stretchable long-fiber nonwoven fabric according to the present embodiment is a stretchable long-fiber nonwoven fabric obtained by arranging long fiber filaments mainly composed of low crystalline polypropylene in the transverse direction and extending in the transverse direction, The draw ratio is 1.1 to 7 times, and the fiber diameter of the long filament after drawing is 5 to 10 μm.

  In the present embodiment, the definition, preferred average length, fiber diameter, and folding width of the long fiber filaments may be the same as those described for the longitudinally stretchable long fiber nonwoven fabric according to the first embodiment. Further, the material of the long fiber filament mainly composed of low crystalline polypropylene may be the same as that described for the longitudinally stretchable long fiber nonwoven fabric according to the first embodiment. In the laterally stretchable long-fiber nonwoven fabric according to the present embodiment, long-fiber filaments are arrayed in the lateral direction and are stretched in the lateral direction.

  Next, this invention is demonstrated from a viewpoint of the manufacturing method of a transverse arrangement stretchable long fiber nonwoven fabric. A method for producing a horizontally aligned stretchable long-fiber nonwoven fabric includes a nozzle group that extrudes a large number of filaments, a conveyor that collects and conveys the filaments extruded from the nozzle groups, and an airflow vibration means that vibrates a high-speed airflow blown to the filaments Preparing a plurality of filaments mainly composed of low-crystalline polypropylene from the nozzle group toward the conveyor, and causing the filaments extruded from the nozzle group to accompany the high-speed air stream And a step of periodically changing the direction of the high-speed airflow in a direction perpendicular to the traveling direction of the conveyor by the airflow vibrating means, thereby producing a long-fiber nonwoven fabric in which filaments are arranged in the lateral direction. And a method of advancing the conveyor, the long-fiber nonwoven fabric in which the filaments are arranged in the transverse direction By uniaxially it stretched perpendicular direction, and a step of obtaining a transversely aligned long-fiber nonwoven fabric.

  FIG. 2: is a schematic front view of the manufacturing apparatus of the horizontal arrangement | sequence stretchable long-fiber nonwoven fabric by the melt blow method which can be used for the manufacturing method of a horizontal arrangement | sequence stretchable long-fiber nonwoven fabric. The nonwoven fabric manufacturing apparatus shown in FIG. 2 mainly includes a melt blow die 101, a conveyor 107, and an airflow vibration mechanism 109. In FIG. 2, the melt blow die 101 is shown in a cross section so that the internal structure can be seen.

  In the front stage of the apparatus, a resin mainly composed of low crystalline polypropylene is charged into an extruder (not shown) having the above-described predetermined composition, melted, extruded, and sent to the melt blow die 101.

  The meltblowing die 101 has a large number of nozzles 103 arranged in a row at the tip (lower end) in a direction perpendicular to the paper surface, that is, in parallel with the traveling direction of the conveyor. A large number of filaments 111 are formed by extruding molten resin mainly composed of low crystalline polypropylene sent from a gear pump (not shown) from the nozzle 103. Air reservoirs 105a and 105b are provided on both sides of each nozzle 103, respectively. High-pressure heated air heated to a temperature higher than the melting point of the resin is sent to the air reservoirs 105a and 105b, and communicates with the air reservoirs 105a and 105b toward the filament 111 from slits 106a and 106b opened at the tip of the meltblowing die 101. Is ejected. As a result, a high-speed air flow substantially parallel to the direction in which the filament 111 is extruded from the nozzle 103 is generated. The filament 111 pushed out from the nozzle 103 is maintained in a meltable state that can be drafted by the high-speed airflow, and the draft is given to the filament 111 by the frictional force of the high-speed airflow, and the filament 111 is thinned. The mechanism described above is the same as that of a normal melt blow method. The temperature of the high-speed airflow is set to 80 ° C. or higher, desirably 120 ° C. or higher, than the spinning temperature of the filament 111.

  As in the first embodiment, the temperature of the filament 111 immediately after being pushed out from the nozzle 103 can be made sufficiently higher than the melting point of the filament 111 by increasing the temperature of the high-speed airflow. The degree of conversion can be reduced.

  A conveyor 107 is disposed below the meltblowing die 101. The conveyor 107 is wound around a conveyor roller and other rollers (not shown) that are rotated by a driving source (not shown), and is driven from the nozzle 103 by driving the conveyor 107 by the rotation of these rollers. The web 120 obtained by accumulating the filaments 111 on the conveyor 107 is conveyed from the back to the front in FIG. 2 or from the front to the back in FIG.

  An airflow vibration mechanism 109 having an elliptical cross section is provided below the meltblowing die 101 and above the conveyor 107 in the flow area of the high-speed airflow by the slits 106a and 106b. The airflow vibration mechanism 109 has a rotation shaft 109a arranged in parallel with the conveying direction of the web 120 on the conveyor 107, and is rotated in the direction of the arrow A in the figure around the rotation shaft 109a. As in the first embodiment, the airflow vibration mechanism 109 can change the flow direction of the filament 111 using the Coanda effect.

  Thus, by rotating the airflow vibration mechanism 109, the filament 111 can be periodically vibrated. Since the rotating shaft 109a of the airflow vibration mechanism 109 is arranged in parallel with the conveying direction of the web 120 by the conveyor 107, the filament 111 vibrates in a direction perpendicular to the conveying direction by the conveyor 107, that is, in the width direction. As a result, the web 120 having the width S in which the filaments 111 are arranged in the width direction on the conveyor 107 is obtained.

  The distance between the airflow axis 100 and the peripheral wall surface 109b when the peripheral wall surface 109b of the airflow vibration mechanism 109 is closest to the airflow axis 100 is L1. Further, the distance between the lower end surface of the meltblowing die 101 that is substantially flush with the tip of the nozzle 103 and the center of the rotation shaft 109a of the airflow vibration mechanism 109 is L2. As these L1 and L2 are smaller, the width S of the resulting web 120 is larger. However, if L1 is too small, troubles such as winding of the filament 111 around the airflow vibration mechanism 109 may occur, and L2 is naturally limited by the size of the cross section of the airflow vibration mechanism 109 and the like. On the other hand, if L1 and L2 are too large, the effect of vibration of the filament 111 by the peripheral wall surface 109b is reduced. Therefore, L1 is preferably 30 mm or less, more preferably 15 mm or less, and most preferably 10 mm or less. L2 is preferably 80 mm or less, more preferably 55 mm or less, and most preferably 52 mm or less. However, the airflow vibration mechanism 109 needs to be disposed at a position where it does not collide with the filament 111.

  Further, the swing width S of the filament 111 also depends on the flow velocity of the high-speed airflow and the rotation speed of the airflow vibration mechanism 109. When the fluctuation of the distance between the airflow axis 100 and the peripheral wall surface 109b due to the rotation of the airflow vibration mechanism 109 is considered as the vibration of the peripheral wall surface 109b, the frequency of the peripheral wall surface 109b that maximizes the swing width of the filament 111 is as follows. Exists. Other than this frequency, the vibration frequency of the peripheral wall 109b is different from the inherent frequency of the high-speed airflow, so the vibration width of the filament 111 is also reduced. This frequency varies depending on the spinning conditions, but when vibrating the filament 111 spun by a general spinning means, a range of 5 Hz to 30 Hz is preferable, more preferably 10 Hz to 20 Hz, and most preferably 12 Hz. The range is 18 Hz or less. The speed of the high-speed airflow is 10 m / sec or more, preferably 15 m / sec or more. If the speed is less than this, the filament 111 may not be sufficiently shaken.

  Note that the length of the airflow vibration mechanism 109 is desirably 100 mm or more larger than the width of the filament group spun by the melt blow die 101. If the length of the airflow vibration mechanism 109 is shorter than this, the flow direction of the high-speed airflow cannot be sufficiently changed at both ends of the filament group, and the lateral arrangement of the filaments 111 at both ends of the filament group is insufficient. There is a risk.

  As described above, the direction of the high-speed airflow is vibrated in the lateral direction by the airflow vibration mechanism 109, thereby the filaments 111 are laterally shaken and accumulated on the conveyor 107, thereby forming the web 120. It is possible to improve the horizontal arrangement of the filaments 111 and to increase the folding width of the filaments 111 on the conveyor 107 (that is, the width S of the web 120). According to this embodiment, the web 120 having a width S of 500 mm or more can be easily obtained, and has an epoch-making effect in that the arrangement of the filaments 111 and the folding width are improved. Such an arrangement of the filaments 111 is effective in improving the lateral strength of the web 120. In addition, the large folding width not only has the effect of arranging the filaments 111 in the lateral direction, but also provides a wide web 120 with high productivity by providing only one nozzle 103 in the width direction of the web 120. It also has the effect that

  The obtained web 120 is transported to the front or back of the paper by the conveyor 107 and stretched by a stretching device (not shown). Examples of the stretching device include, but are not limited to, a pulley-type stretching device and a tenter stretching device. Similar to the first embodiment, the draw ratio is 1.1 to 7 times, and preferably 2.5 to 6 times. The definition of the draw ratio is as described in the first embodiment. Through such a drawing process, the transversely aligned stretchable long-fiber nonwoven fabric according to the present embodiment is obtained.

  The obtained transversely stretchable long-fiber nonwoven fabric may be further stretched as necessary, as in the first embodiment, or may be subjected to post-treatment such as partial adhesion treatment such as heat treatment or heat embossing. . Moreover, in order to cool the filament sufficiently, a spray nozzle for spraying mist-like water may be provided.

  The transversely aligned stretchable long-fiber nonwoven fabric according to this embodiment produced by the production method according to the above production method and its modified form is excellent in stretchability in the transverse direction in addition to the fiber diameter and the draw ratio as described above. Yes.

  In a preferred embodiment, the transversely aligned stretchable long-fiber nonwoven fabric according to the present embodiment is in the direction of fibers, that is, the direction of the orientation of long-fiber filaments, and the elongation in the lateral direction, which is the stretching direction, is 1 to 20%. Preferably, it is 5 to 15%. Such an elongation shall mean the value measured by JIS L1096 8.16.1 a) A method. Moreover, in preferable embodiment, the expansion | extension recovery rate to the horizontal direction which is the direction of a fiber is 80 to 100%, preferably 90 to 100% in the horizontal arrangement stretchable long-fiber nonwoven fabric concerning this embodiment. is there. The elongation recovery rate is a value measured by JIS L1096 8.16.2 a) A method.

  The transversely aligned stretchable long-fiber nonwoven fabric according to the present embodiment may have both the elongation and elongation recovery characteristics, or may have one of these characteristics. These characteristics are clearly different from conventional long-fiber nonwoven fabrics manufactured from polyethylene terephthalate by the same manufacturing method, and have the desired stretchability and followability in the direction of alignment. It has become.

  The orthogonal long fiber nonwoven fabric obtained in this way has elasticity in both the vertical and horizontal directions, and as a result has a certain degree of elasticity in almost all directions. Especially excellent in properties.

[Third Embodiment: Laminate]
The present invention, according to the third embodiment, is a laminate, in which long fiber filaments mainly composed of low crystalline polypropylene are arranged in one direction and stretched in the direction of the arrangement. It comprises a first fiber layer made of such stretchable nonwoven fabric and a second fiber layer, and the first fiber layer and the second fiber layer are laminated and thermally welded. . And the second fiber layer
a) a stretchable long-fiber nonwoven fabric in which the first fiber layer and the fiber arrangement direction are substantially orthogonal;
b) A long-fiber nonwoven fabric in which long fiber filaments mainly composed of non-low crystalline polypropylene are arranged in one direction and stretched in the direction of the arrangement, and the arrangement direction of the first fiber layer and the fibers is A non-woven fabric that is substantially orthogonal,
c) Any one fiber layer of the network structure or a combination of two or more fiber layers thereof. Each aspect will be described below. In the present embodiment, the terms “first fiber layer” and “second fiber layer” are used to distinguish two different fiber layers, and do not limit the stacking order or the like. Can be used interchangeably.

a) Laminated body including orthogonal long-fiber nonwoven fabric (bidirectional stretchability) In this embodiment, the first fiber layer is a stretchable long-fiber nonwoven fabric in which fibers are arranged in one direction according to the present invention. The fiber layer is a stretchable continuous fiber nonwoven fabric in which the first fiber layer and the fiber arrangement direction are substantially orthogonal to each other. Typically, the first fiber layer is a longitudinally aligned stretchable long-fiber nonwoven fabric according to the first embodiment, and the second fiber layer is a laterally-aligned stretchable long-fiber nonwoven fabric according to the second embodiment. The laminate is an orthogonal long fiber nonwoven fabric obtained by laminating at least these fiber layers and heat-sealing them, and has stretchability in at least two directions.

  The longitudinally-aligned stretchable long-fiber nonwoven fabric and the laterally-aligned stretchable long-fiber nonwoven fabric are as described in the first and second embodiments. Here, the average length, the fiber diameter, and the folding width of the preferred fibers may be substantially the same in the longitudinally-arranged stretchable long-fiber nonwoven fabric and the laterally-arranged stretchable long-fiber nonwoven fabric, and are defined in each embodiment. It may be different within the range. It can be designed appropriately according to the strength, elongation, etc. required in each of the vertical and horizontal directions. In addition, the resin mainly composed of low crystalline polypropylene as a filament raw material may be the same in the longitudinally stretchable long fiber nonwoven fabric and the laterally stretchable long fiber nonwoven fabric, and in each embodiment It may be different within the defined range. Preferably, the resin mainly composed of low crystalline polypropylene as a raw material is composed of the same material. This is because the adhesiveness is increased in the heat welding after the lamination.

  The manufacturing method of the orthogonal long fiber nonwoven fabric by this aspect manufactures a longitudinally-arranged stretchable long fiber nonwoven fabric by the manufacturing method described in the first embodiment, and separately from the horizontal alignment by the manufacturing method described in the second embodiment. Stretchable long-fiber nonwoven fabrics are manufactured, and each is overlapped in the supply direction. Next, the two long-fiber nonwoven fabrics that are overlapped are supplied between a pair of opposed heating cylinders, and heat-welded at a temperature of 50 to 80 ° C. while being fixed so as not to shrink in the width direction. . Thereby, an orthogonal long fiber nonwoven fabric in which the arrangement directions of the two stretchable long fiber nonwoven fabrics are orthogonal to each other can be obtained.

b) Laminated body including orthogonal long fiber nonwoven fabric (unidirectional stretchability) In this embodiment, the first fiber layer is a stretchable long fiber nonwoven fabric in which fibers are arranged in one direction according to the present invention. Typically, the first fiber layer is the longitudinally stretchable long-fiber nonwoven fabric according to the first embodiment or the laterally stretchable long-fiber nonwoven fabric according to the second embodiment. The second fiber layer is a long fiber nonwoven fabric in which long fiber filaments mainly composed of non-low crystalline polypropylene are arranged in one direction and stretched in parallel to the direction of the arrangement. This is a long-fiber nonwoven fabric in which the arrangement direction is substantially orthogonal to the fiber layer. The laminate is an orthogonal long fiber nonwoven fabric obtained by laminating at least these fiber layers and heat-sealing them, and has stretchability in at least one direction.

  In this embodiment, the second fiber layer is typically a long-fiber nonwoven fabric that does not have stretchability. Non-low-crystalline polypropylene is not atactic polypropylene but polypropylene in which methyl groups of propylene units are regularly arranged with respect to the main chain. Such a non-stretchable long-fiber non-woven fabric is appropriately changed in the manufacturing method according to the first embodiment, the second embodiment, or a variation thereof, depending on the material and, in some cases, the spinning temperature, the temperature of the high-speed air stream, and the flow rate. By doing so, it can be manufactured. Moreover, the manufacturing method of the orthogonal long fiber nonwoven fabric in this aspect can be implemented similarly to aspect a) except the manufacturing method of a 2nd fiber layer.

c) Laminate comprising stretchable long-fiber nonwoven fabric and network structure In this aspect, the first fiber layer is the stretchable long-fiber nonwoven fabric according to the present invention, typically according to the first embodiment. It is a longitudinally aligned stretchable long-fiber nonwoven fabric or a laterally stretchable stretchable long-fiber nonwoven fabric according to the second embodiment. The second fiber layer is a network structure. Examples of the network structure include a network structure made of the following film, nonwoven fabric, woven fabric, or any combination thereof.
1) A split fiber film obtained by splitting a uniaxially stretched multilayer film along the stretching direction and widening in a direction perpendicular to the stretching direction. 2) A slit is formed along the unidirectional direction in the multilayer film, and uniaxial in the direction. Stretched network film 3) Split fiber nonwoven fabric obtained by laminating the split fiber film of 1) above so that the stretch direction is orthogonal 4) Split fiber film of 1) and the net film of 2) 5) Nonwoven fabric obtained by laminating uniaxially stretched multilayer tapes so that they intersect each other 6) Woven fabric obtained by weaving uniaxially stretched multilayer tapes so that they intersect each other Cloth 7) Arbitrary combination consisting of two or more of 1) to 6) above

  As a multilayer film and a multilayer tape constituting each network structure, a layer made of a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin on both sides of the layer made of the first thermoplastic resin Those having a three-layer structure are preferred. It is from a viewpoint which adhere | attaches a laminated body by heat welding. The thickness of the layer made of the second thermoplastic resin is 50% or less, desirably 40% or less, of the total thickness of the multilayer film or multilayer tape. In order to satisfy various physical properties such as adhesive strength at the time of heat welding, the thickness (before stretching) of the layer made of the second thermoplastic resin may be 5 μm or more, preferably selected from the range of 10 to 100 μm. Is done. Examples of the first thermoplastic resin and / or the second thermoplastic resin include polyolefins such as polyethylene and polypropylene and copolymers thereof, polyethylene terephthalate, polyesters in the polybutylene terephthalate group, and copolymers thereof, nylon 6, polyamides such as nylon 66 and copolymers thereof, polymers and copolymers of polyvinyl chloride, methacrylic acid or derivatives thereof, polystyrene, polysulfone, polytetrachloroethylene polycarbonate, polyurethane and the like. Preferred are polyethylene and polypropylene.

  Any one of the network structures 1) to 6) includes a layer formed by uniaxially stretching a multilayer film having the multilayer structure in one direction, for example, the longitudinal direction or the lateral direction, or the longitudinal direction of the tape, The draw ratio is preferably 1.1 to 15 times, more preferably 3 to 10 times. By uniaxially stretching the multilayer film, the molecules constituting the film are oriented in the stretching direction. As a result, in the second fiber layer made of the network structure, the fibers are arranged in the drawing direction. The split fiber film of 1) is obtained by splitting a uniaxially stretched multilayer film along the stretching direction and widening it in a direction perpendicular to the stretching direction, and typically the trunk fibers extending in parallel with each other and the adjacent ones. And branch fibers that connect the trunk fibers to each other and are stretched in the longitudinal direction. The network film of 2) is formed by forming slits in one direction in the multilayer film and uniaxially stretching in the above direction, and typically has a rhomboid network structure and is stretched in the transverse direction. . Alternatively, it comprises trunk fibers extending in parallel to each other and branch fibers connecting the adjacent trunk fibers to each other, comprising a pattern rotated about 90 degrees with respect to the split fiber film of 1) and stretched in the transverse direction. Yes. 5), 6) A uniaxially stretched multilayer tape is manufactured by cutting a uniaxially stretched multilayer film along the stretching direction, or by cutting the multilayer film to a predetermined width and then uniaxially stretching in the longitudinal direction. Can do. The width of the uniaxially stretched multilayer tape may be, for example, 2 to 8 mm, but is not limited to a specific width. 7) includes, for example, a first uniaxially stretched multilayer tape group composed of a uniaxially stretched multilayer tape group that obliquely crosses in the stretching direction (fiber arrangement direction) and extends in parallel to the film of 1) or 2) And a second uniaxially stretched multilayer tape group extending obliquely in the stretching direction of the film of 1) or 2) from the opposite direction to the first uniaxially stretched multilayer tape group layer and extending parallel to each other There is a nonwoven fabric formed by laminating a uniaxially stretched multilayer tape group layer.

  The stretchable long-fiber nonwoven fabric according to the present invention which is the first fiber layer, typically the stretchable long-fiber nonwoven fabric according to the first embodiment or the second embodiment, and the second fiber layers 1) to 7 ) Can be combined in any combination, but the first fiber layer and the second fiber layer have different fiber arrangement directions (stretching directions), intersect, or orthogonal. It is preferable to include such a combination.

  As a specific example of a laminate including a network structure, a laminate including the longitudinally stretchable long fiber nonwoven fabric according to the first embodiment and the mesh film of 2), and a laterally aligned length stretch according to the second embodiment A laminated body comprising the long-fiber nonwoven fabric and the split fiber film of 1) is mentioned, but it is not limited thereto.

  About the manufacturing method of a laminated body, the elastic long fiber nonwoven fabric which concerns on this invention, typically the elastic long fiber nonwoven fabric by 1st Embodiment or 2nd Embodiment is manufactured. Apart from this, any one of the above-mentioned network structures is manufactured by the prior art. Then, they are overlapped in the supply direction. Next, the laminate of the stretchable long-fiber nonwoven fabric and the network structure is supplied between, for example, a pair of opposed heating cylinders, and heat-welded at a temperature of 50 to 80 ° C. to produce a laminate. can do.

  The laminate according to the present embodiment has the advantage of having stretchability in any longitudinal and lateral directions, and is preferably used in applications such as a unidirectional restriction stretchable material used for sanitary materials.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples do not limit the present invention.

[Example 1]
In Example 1, a longitudinally aligned stretchable long-fiber nonwoven fabric was produced using the same device as that shown in FIG. 1, and the physical properties thereof were measured. A melt blow die having a spinning nozzle with a nozzle diameter of 0.38 mm, a nozzle pitch of 1.0 mm, and a spinning width of 500 mm was disposed perpendicular to the traveling direction of the conveyor. As the filament material, atactic polypropylene (Idemitsu Kosan, S600) having a melt flow rate of 600 g / 10 min and a melting point of 80 ° C. was used. From this melt blow die, the discharge amount per nozzle was 0.33 g / min, the die temperature was 250 ° C., and the filament was extruded. The high-speed air flow for drafting and thinning the filament extruded from the nozzle had a temperature of 300 ° C. and a flow rate of 2000 Nl / min. Further, the filament was cooled by spraying mist water from the spray nozzle. As the airflow vibration mechanism, a single rod-shaped body having an elliptical cross section as shown in FIG. 1 was used. In this airflow vibration mechanism, shaft members are integrally provided on both ends of the cylindrical body coaxially with the axis of the cylindrical body, and these shaft members are rotatably supported and rotated by a drive source (not shown). By doing so, the cylindrical body is rotated around the shaft portion. Details of such an airflow vibration mechanism are described in detail in Patent Document 1 by the present applicants. The airflow vibration mechanism was arranged so that the distance from the extension line of the melt blow die nozzle was 15 mm at a minimum. The number of rotations of the airflow vibration mechanism was measured and rotated so that the frequency of vibration on the peripheral wall surface of the airflow vibration mechanism was 20.0 Hz, and the filaments were collected on the conveyor in a state of being arranged in the vertical direction. And the web which consists of a filament group collected on the conveyor was heated with the extending | stretching cylinder, and it extended | stretched 4 times to the vertical direction, and obtained the longitudinally-arranged stretchable long-fiber nonwoven fabric.

[Comparative Example 1]
The longitudinal length of Comparative Example 1 was the same as Example 1 except that polyethylene terephthalate having an intrinsic viscosity of 0.57 dl / g was used as the filament material, the die temperature was changed to 320 ° C., and the high-speed air flow was changed to 300 ° C. A fiber nonwoven fabric was obtained.

  About the longitudinally-aligned stretchable long-fiber nonwoven fabric of Example 1 and the longitudinally-aligned long-fiber nonwoven fabric of Comparative Example 1 obtained in JIS L1096 8.16.2 a) Stretchability of stretchable woven fabric and knitted fabric by A method The elongation rate in the longitudinal direction, the elongation recovery rate, and the residual strain rate were measured by the prescribed measurement method. The measurement results are shown below.

  In the longitudinally aligned stretchable long-fiber nonwoven fabric of Example 1, a large elongation rate in the longitudinal direction, an elongation recovery rate, and a small residual strain rate were observed. No elongation was observed. In the table, the indication of “ND” in the elongation recovery rate and the residual strain rate of Comparative Example 1 indicates that the longitudinally aligned long fiber nonwoven fabric of Comparative Example 1 was not stretched and could not be measured.

[Example 2]
In Example 2, a transversely aligned stretchable long-fiber nonwoven fabric was produced using the same device as that shown in FIG. 2, and the physical properties thereof were measured. A melt blow die having a spinning nozzle having a nozzle diameter of 0.3 mm, a nozzle pitch of 1.0 mm, and a spinning width of 500 mm was disposed in parallel with the traveling direction of the conveyor. As the filament material, atactic polypropylene (Idemitsu Kosan, S600) having a melt flow rate of 600 g / 10 min and a melting point of 80 ° C. was used. The molten resin was extruded from a melt blow die with a discharge amount per nozzle of 0.35 g / min and a die temperature of 250 ° C. The high-speed air flow for thinning the extruded filament was set to a temperature of 300 ° C. and a flow rate of 1000 Nl / min. As the airflow vibration mechanism, a single rod-shaped body having an elliptical cross section as shown in FIG. 2 was used. This rod-shaped body had a short axis length of 60 mm and a long axis length of 90 mm in cross section, and was arranged so that L1 in FIG. 2 was 15 mm and L2 was 55 mm. The rotation speed of the rod-shaped body is 600 rotations / minute (the cross section is an ellipse, and there are two locations closest to the airflow axis in one rotation, so the frequency of the airflow is 20 Hz), The filament was vibrated laterally. The rotation direction of the rod-shaped body was the arrow A direction shown in FIG. The web thus obtained was stretched 5.5 times in the transverse direction in hot air at 60 ° C. with a pulley-type stretching device to obtain a transversely aligned stretchable long-fiber nonwoven fabric.

[Comparative Example 2]
As the filament material, the same polyethylene terephthalate as in Comparative Example 1 was used, and the transversely aligned long fiber nonwoven fabric of Comparative Example 2 was obtained in the same manner as in Example 2 except that the die temperature was changed to 320 ° C. and the high-speed airflow was changed to 300 ° C. It was.

  About the obtained transversely-aligned stretchable long-fiber nonwoven fabric of Example 2 and the laterally-aligned long-fiber nonwoven fabric of Comparative Example 2, the elongation rate in the lateral direction and the recovery of elongation were measured by the same measurement method as in Example 1 and Comparative Example 1. Rate and residual strain rate were measured. The measurement results are shown below.

  In the transversely aligned stretchable long-fiber nonwoven fabric of Example 2, a large elongation rate in the transverse direction, an elongation recovery rate, and a small residual strain rate were observed. On the other hand, in the transversely aligned long fiber nonwoven fabric of Comparative Example 2, almost no elongation was observed, and the elongation recovery rate and residual strain rate were not measurable (ND in Table 2). This result was almost the same as the result obtained in the longitudinally aligned stretchable long-fiber nonwoven fabric.

  The reticulated laminated nonwoven fabric according to the present invention is very useful as an interior use, a packaging material application, a clothing application, a sanitary material application such as a disposable diaper, and an adhesive nonwoven fabric.

DESCRIPTION OF SYMBOLS 1,101 Melt blow die 2 Molten resin 3, 103 Nozzle 5a, 5b, 105a, 105b Air reservoir 6a, 6b, 106a, 106b Slit 7, 107 Conveyor 8 Spray nozzle 9, 109 Air flow vibration mechanism 9a, 109a Rotating shaft 9b, 109b Peripheral wall 11, 111 Filament 12a, 12b Stretch cylinder 13 Conveyor roller 14 Press roller 15 Press rubber roller 16a, 16b Take-off nip roller 18 Longitudinal stretch elastic fiber nonwoven fabric 100 Airflow shaft 120 Web

Claims (5)

Stretchable long-fiber nonwoven fabric in which long fiber filaments mainly composed of low crystalline polypropylene are arranged in one direction and stretched in the direction of the arrangement,
The long fiber filament is a filament having a fiber diameter of 5 to 15 μm,
A stretchable nonwoven fabric having a stretching ratio of 1.1 to 7 times.   The stretchable long-fiber non-woven fabric according to claim 1, wherein the low crystalline polypropylene is an atactic polypropylene having a melt flow rate of 50 to 2000 g / 10 min.   The stretchable long-fiber nonwoven fabric according to claim 1 or 2, wherein an elongation rate in the direction of the arrangement is 1 to 20%.   The stretchable long-fiber nonwoven fabric according to claim 1 or 2, wherein an elongation recovery rate in the direction of the arrangement is 80 to 100%. A first fiber layer comprising the stretchable long-fiber nonwoven fabric according to any one of claims 1 to 4 and a second fiber layer, wherein the first fiber layer and the second fiber layer A laminate formed by laminating a fiber layer and heat-sealing,
The second fiber layer is
a) The stretchable long-fiber nonwoven fabric according to any one of claims 1 to 4, wherein the stretch direction of the stretchable fiber is substantially orthogonal to the first fiber layer;
b) A long-fiber nonwoven fabric in which long fiber filaments mainly composed of non-low crystalline polypropylene are arranged in one direction and stretched in the direction of the arrangement, and the arrangement direction of the first fiber layer and the fibers is A non-woven fabric that is substantially orthogonal,
c) one or more fiber layers selected from a network structure;
The network structure is
1) A split fiber film obtained by splitting a uniaxially stretched multilayer film along the stretching direction and widening in a direction perpendicular to the stretching direction. 2) A slit is formed along the unidirectional direction in the multilayer film, and uniaxial in the direction. Stretched network film 3) Split fiber nonwoven fabric obtained by laminating the split fiber film of 1) above so that the stretch direction is orthogonal 4) Split fiber film of 1) and the net film of 2) 5) Nonwoven fabric obtained by laminating uniaxially stretched multilayer tapes so that they intersect each other 6) Woven fabric obtained by weaving uniaxially stretched multilayer tapes so that they intersect each other Cloth 7) A laminate selected from the group consisting of any combination of two or more of 1) to 6) above.