JPH09143852A - Spun-bonded nonwoven fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spun-bonded nonwoven fabric having excellent softness and feeling and especially excellent lateral stretchability and provide its production process. SOLUTION: A spun-bonded nonwoven fabric having a self-welded region is placed on a plain-weave supporting mesh having an absolute value of A-B of 150-400μm wherein A is the maximum height of protrusions formed by positioning a weft under a warp and B is the maximum height of protrusions formed by positioning a warp under a weft. The continuous filaments constituting the nonwoven fabric are mutually interlocked by applying a high-pressure water jet from the surface of the nonwoven fabric. A part of the self-welded regions are physically destructed and a clear zig-zag perforated pattern is formed on the nonwoven fabric by this procedure. The specific energy applied to the nonwoven fabric by the high-pressure water jet is 0.5×10<-3> to 3×10<-3> kwh/ kg. The lateral elongation of the nonwoven fabric under a load of 1kgf/100mm in lateral direction is 50-200%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a regular and intermittent self-bonding area, and has a clear staggered opening pattern and the elongation of a nonwoven fabric when a load of 1 kgf / 100 mm is applied in the lateral direction. Has a lateral stretchability of 50 to 200%, is flexible and has excellent lateral stretchability, and is integrated with a stretchable base material for stretchable parts of disposable hygiene products such as disposable diapers and sanitary napkins and medical products, and a stretchable film. The present invention relates to a spunbonded nonwoven fabric that can be suitably used as a material for a stretchable nonwoven fabric composite sheet substrate and the like, and a method for producing the same.

[0002]

2. Description of the Related Art A thermoplastic resin is heated and melted, extruded from a large number of spinnerets of an extrusion spinning machine, spun, and a spun continuous filament filament group is taken out by an ejector while being drawn with high-speed high-pressure air, and opened. The continuous fiber non-woven fabric obtained by collecting and accumulating on a support surface for collection to form a web, and then subjecting the web to a thermocompression treatment to provide regular and intermittent self-fusion areas, It is generally called spunbond nonwoven fabric. This spunbonded nonwoven fabric has not only higher productivity than other nonwoven fabrics but also high strength and is used in a wide range. However, the spunbonded non-woven fabric maintains a sheet-like form and is provided with a large number of self-bonding regions for the purpose of imparting strength to the non-woven fabric, and the presence of these self-bonding regions reduces the bulkiness and flexibility of the non-woven fabric. The elongation is limited to the direction perpendicular to the flow (longitudinal) direction of the nonwoven fabric, that is, the lateral elongation of the nonwoven fabric is also small.

As a method for imparting bulkiness and flexibility to a spunbonded nonwoven fabric, a method utilizing crimping of composite long fibers or a high pressure water column for a spunbonded nonwoven fabric as disclosed in JP-A-2-229253. There is a method of applying a flow (water confounding) treatment. The former is known, for example, by using a crimp of a so-called side-by-side type composite long fiber obtained by extruding two kinds of different resins from the same spinneret and spinning at a high speed. In this case, the purpose of maintaining the fiber form and imparting strength is known. Since the heat fusion treatment is carried out in, the fibers are fixed at the fusion points between the fibers, and high lateral elongation of the nonwoven fabric cannot be expected. In the latter case, after the web collected and accumulated in the process of manufacturing the spunbonded nonwoven fabric is subjected to high pressure water column flow treatment,
Performed thermocompression bonding to develop strength in the nonwoven fabric,
Then, the high pressure water column flow treatment is performed again. In this method, the fibers are certainly arranged in the thickness direction of the non-woven fabric, and the fibers are entangled with each other, so that the bulkiness of the non-woven fabric is improved, but this method requires extremely complicated operation and the high-pressure water column flow. The treatment does not destroy the fusion point between the fibers that exert strength, so the fibers are still fixed at the fusion point, and similar to the former, improvement in lateral elongation of the nonwoven fabric can hardly be expected.

Further, in Japanese Patent Laid-Open No. 7-164643,
After laminating a paper sheet made of pulp fiber on a spunbonded non-woven fabric, high pressure water column flow is applied from the surface of the paper sheet to entangle the pulp fiber and the long fiber of the non-woven fabric to form a non-woven fabric composite. The maximum height A of the protruding portion caused by the placement of the weft thread under the warp thread, which was measured by placing a support net on a horizontal table when manufacturing the sheet.
And the absolute value of the difference A−B between the maximum height B of the protruding portion caused by the warp thread being positioned below the weft thread is 200 to 4
A method for producing a non-woven composite sheet having a clear staggered opening pattern using a support net composed of 00 μm is disclosed. In this method, since a paper sheet is used, almost no elongation is imparted to the non-woven composite sheet, and the purpose of imparting a staggered opening pattern is to impart a good-looking, clear and beautiful pattern to the wiping cloth. is there.

[0005]

In view of the above situation, the present inventors have found that the spunbonded non-woven fabric having a self-bonding area is provided with sufficient lateral extensibility. Therefore, in particular, the lateral direction of the non-woven fabric is 1 kgf / 100 mm. Various studies were conducted in order to obtain a lateral elongation of the nonwoven fabric of 50 to 200% when a load is applied. As a result, it was found that the lack of lateral stretchability of spunbonded nonwoven fabrics was due to the presence of self-bonding areas due to the heat treatment provided in the nonwoven fabrics. By subjecting the spunbonded non-woven fabric to lateral expansion, the self-fusing area was physically destroyed by the water column flow treatment, and at the same time, the long fibers composing the non-woven fabric were newly entangled. It was found that the nonwoven fabric can be imparted with lateral stretchability by cutting a part of the fiber, and the opening pattern of the nonwoven fabric provided by further performing high pressure water column flow treatment is changed to a clear staggered pattern of holes. By doing so, it was found that the lateral elongation of the nonwoven fabric can be promoted, and the present invention has been completed. That is, an object of the present invention is, in a long-fiber spunbonded non-woven fabric having a self-bonding area composed of continuous filaments, a regular and intermittent self-bonding area is partially destroyed, resulting in entanglement of long fibers and sharp Has a staggered pattern of holes and 1kgf / 1 in the lateral direction of the nonwoven fabric.
It is to provide a spunbonded nonwoven fabric in which the nonwoven fabric has a lateral elongation of 50 to 200% when a load of 00 mm is applied, and a method for producing the spunbonded nonwoven fabric.

[0006]

The first object of the present invention is to provide a spunbonded non-woven fabric having regular and intermittent self-fusing zones, which is composed of continuous filaments obtained by melt-spinning a thermoplastic resin, Continuous long fibers are entangled with each other, a part of the self-bonding area is destroyed, and the nonwoven fabric has a clear zigzag pattern of openings, and is 1 k in the transverse direction which is perpendicular to the flow direction of the nonwoven fabric.
When a load of gf / 100mm is applied, the nonwoven fabric is 50-2
It is a spunbonded nonwoven fabric characterized by having a lateral elongation of 00%. The second of the present invention is to heat and melt a thermoplastic resin, extrude it from a spinneret and spin it, and take out the spun continuous filament filament group while stretching it with high-speed high-pressure air by an ejector, open it, and collect it. A method for producing a spunbonded nonwoven fabric by forming a web by collecting it on a support surface and subjecting the web to a thermocompression bonding treatment to provide a self-fusion bonding region, wherein a spunbonded nonwoven fabric having the self-fusion bonding region, The maximum height A of the protruding portion caused by the weft thread being positioned under the warp thread and the maximum height of the protruding portion caused by the warp thread being positioned under the weft thread, measured by placing the support net on a horizontal table. The difference between AB and B is placed on a plain weave support net having an absolute value in the range of 150 to 400 μm, high pressure water column flow is applied from the surface of the non-woven fabric, and the continuous long fibers constituting the non-woven fabric are entangled with each other. Some were cut, and physically destroy a part of the self-bonding zone,
A method for producing a spunbonded nonwoven fabric, which comprises providing a clear staggered opening pattern on the nonwoven fabric. A third aspect of the present invention is that, when a high-pressure water column flow is applied from the surface of a spunbonded nonwoven fabric, the specific energy imparted to the nonwoven fabric by the high-pressure water column flow ejected from one hole of a nozzle is 0.5 × 10 ^{−3 to} 3 ^−3. ×
The method for producing a spunbonded nonwoven fabric according to claim 2, wherein the range is 10 ^-3 kwh / kg.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the spunbonded nonwoven fabric of the present invention, a part of the self-bonding area is destroyed, a part of the long fiber is cut, and a new entanglement between the long fibers is performed, and a clear zigzag pattern is formed. When a load of 1 kgf / 100 mm is applied in the direction perpendicular to the flow direction when manufacturing a nonwoven fabric, that is, in the transverse direction of the nonwoven fabric, the nonwoven fabric is in a range of 50 to 200%. Has lateral stretchability. The nonwoven fabric of the present invention is also used as a base material for stretchable parts of hygiene products and medical products as described above, but such products are required to have easy handling, easy movement, etc. The stretchable base material is required to have a property of high elongation even under a low load, rather than simple lateral elongation such as the elongation at break in the lateral direction. Therefore, if the spunbonded nonwoven fabric of the present invention has an elongation of less than 50% when a load of 1 kgf / 100 mm is applied in the transverse direction of the nonwoven fabric, the spunbonded nonwoven fabric will retain its original sense of rigidity, and the expansion and contraction for the above-mentioned applications. It is not suitable as a substrate for parts. If the lateral elongation of the non-woven fabric exceeds 200%, the dimensional stability of the non-woven fabric becomes poor and handling becomes difficult, which is not suitable.

The above-described spunbonded nonwoven fabric having lateral stretchability can be easily obtained by the following method. The spunbond nonwoven fabric used in the present invention is obtained by heating and melting a thermoplastic resin, extruding from a large number of spinnerets of an extrusion spinning machine, spinning, and spinning a continuous continuous fiber filament group with an ejector at a high speed and high pressure air. Obtained by pulling, opening, collecting and collecting on a support surface for collecting to form a web, and then subjecting the web to a thermocompression treatment to provide regular and intermittent self-fusing zones It is a known long-fiber nonwoven fabric. At this time, the long fibers are not particularly limited, and known long fibers can be used, for example,
In addition to polyolefin-based long fibers, polyester-based long fibers, polyamide-based long fibers, polyacrylic acid-based long fibers, and the like, side-by-side type or sheath core type composite long fibers made of two kinds of resins can be mentioned. It is selected and used.

The fineness of the long fibers is 0.5 to 10 denier,
It is preferably 1 to 6 denier. The fineness of long fibers is 0.
When it is less than 5 denier, continuous long fibers cannot be continuously and stably spun. When the fineness exceeds 10 denier, the fiber becomes thick and the flexibility of the nonwoven fabric is lowered, and it becomes difficult to cut the fiber by the high pressure water column flow treatment described later, which is not suitable. As described above, the spunbonded nonwoven fabric used in the present invention is intermittently provided with regular self-fusing regions. This self-fusing area is introduced by introducing continuous continuous fiber webs collected on the surface of the support for collection between a heated concavo-convex roll and a smooth roll, and heating and pressing at that time to form the concavo-convex roll. It is formed by fusing the non-woven fabric portion corresponding to the convex portions of.

In this case, the temperature of the roll is 5 to 50 ° C., preferably 10 ° C., higher than the melting point of the resin constituting the long fiber used.
-40 ° C lower temperature. If the difference between the roll temperature and the melting point of the resin is less than 5 ° C., the fibers adhere to the roll during thermocompression treatment by the roll, which causes manufacturing troubles, which is not preferable. On the contrary, the difference between the roll temperature and the melting point of the resin is 5
If the temperature exceeds 0 ° C, the self-bonding area will not be sufficiently formed,
Not only is the strength of the non-woven fabric remarkably reduced, but in an extreme case, the form of the non-woven fabric is not exhibited, which is not preferable. Further, the linear pressure when the thermocompression bonding treatment is performed with the uneven roll and the smooth roll is 10 to 80 kg / cm, preferably 20 to 60 kg / cm. Linear pressure is 10kg / cm
If it is less than 80%, the formation of the self-bonding area by thermocompression bonding becomes insufficient, and if it exceeds 80 kg / cm, the obtained spunbonded nonwoven fabric has a film-like texture, which is not preferable.

The area of each self-bonding area formed by the thermocompression bonding process is in the range of 0.03 to ¹ mm ² .
If the area of this self-fusion area is less than 0.03 mm ² , the strength of the nonwoven fabric after the high-pressure columnar flow treatment described below is remarkably reduced. Conversely, if the area of the self-fusion area exceeds 1 mm ² , a film is formed. The area of the portion is too large, and the spunbonded nonwoven fabric becomes film-like and inferior in flexibility even after a part of the self-fusion region is broken by the high pressure water column flow treatment, which is not preferable. Also, the total area of this self-fusion area is
It is in the range of 2 to 20 area% of the surface area of the spunbonded nonwoven fabric. If the total area of the self-bonding area is less than 2% by area,
When the strength of the non-woven fabric after the high pressure water column flow treatment was remarkably reduced and conversely the total area of the self-bonding regions exceeded 20% by area, a part of the self-fusion region was destroyed by the high pressure water column flow process. Even after that, the spunbonded nonwoven fabric becomes film-like and inferior in flexibility, which is not preferable.

The basis weight of the spunbonded nonwoven fabric used in the present invention is 12 to 50 g / m ² , preferably 18 to 35 g / m ² .
² When the basis weight of the non-woven fabric is less than 12 g / m ² , the strength of the non-woven fabric after the high pressure water column flow treatment is significantly reduced, which is not preferable. Further, when the basis weight exceeds 50 g / m ² , the flexibility of the obtained non-woven fabric is impaired, and it becomes difficult to destroy a part of the self-fusion zone by the high pressure column water treatment. In the present invention, a part of the self-bonding area of the spunbonded non-woven fabric is destroyed, or long fibers are cut, and the long fibers constituting the non-woven fabric are newly entangled. The process of injecting is performed so as to perform.

The high pressure water column flow used in the present invention has a pore size of
0.1-0.35 mm, preferably 0.12-0.25
Obtained by ejecting water through a mm nozzle
Can be If the diameter of the nozzle hole is less than 0.1 mm, the nozzle
This is not suitable because the holes are easily clogged, and conversely the hole diameter is 0.3.
If it exceeds 5 mm, the texture of spunbonded nonwoven fabric will deteriorate.
Moreover, the amount of water used increases, which is not preferable. High pressure
The water pressure to generate the water column flow is arbitrary, but the nozzle
The high-pressure water column flow ejected from one hole in the
The specific energy given to the woven cloth is 0.5 × 10 ^-3~ 3 x 10
^-3Must be set to be in the range of kwh / kg
Absent. Specific energy 0.5 × 10^-3less than kwh / kg
In spunbond non-woven fabric because the specific energy is too small
Destroy part of the self-bonding area of the fabric or part of the filament
Spunbond nonwoven fabrics that are difficult to cut and can be obtained
It is not possible to impart the desired lateral stretchability to
Has a specific energy of 3 × 10^-3When it exceeds kwh / kg,
Since the specific energy is too large,
Excessive destruction of self-bonding area or excessive cutting of long fibers
Strength of spunbonded non-woven fabric after high pressure water column flow treatment
Of the non-woven fabric may be significantly reduced.
It started to break before the elongation reached 50%
Not suitable.

Since the specific energy used in the present invention is related to the factors such as the hole diameter of the nozzle used and the basis weight of the spunbonded nonwoven fabric as shown in the following formula (1), it is necessary to determine the water pressure of the high pressure water column flow. Must take these factors into account. ^{E = {A · Cd 3 ·} (2 / ρ) 1/2 · (g · P) 2/3} / M ··· (1) However, E: ratio per substrate unit weight energy A: nozzle hole Total area Cd: Discharge coefficient (correction coefficient of pressure loss) ρ: Density of water g: Gravitational acceleration P: Water pressure of high pressure water column flow M: Weight of base material treated in unit time

In the present invention, the self-bonding area of the nonwoven fabric is destroyed, the long fibers are cut, and the new long fibers are entangled with each other by the high-pressure water column flow treatment, and at the same time, the spunbonded nonwoven fabric has a clear staggered opening pattern. In order to provide the spunbonded non-woven fabric, a plain weave support net specially selected as a support on which the non-woven fabric is placed is used in the step of subjecting the spunbonded non-woven fabric to a high pressure column flow. That is, as shown in FIG. 1, the plain weave support net 1 used in the present invention is a plain weave net consisting of warp yarns 2 and weft yarns 3. The support net 1 was measured by placing the support net 1 on a horizontal table. The maximum height A of the protruding portion (knuckle: ∘ mark) of the warp thread 2 caused by the weft thread 3 being positioned below the warp thread 2 constituting the 1 and the warp thread 3 caused by the warp thread 2 being positioned below the weft thread 3 Difference from the maximum height B of the protrusion (knuckle: x),
The absolute value of AB is 150 to 400 μm, preferably 20.
It is in the range of 0 to 400 μm. In the present invention,
As a method for imparting a clear staggered opening pattern to the nonwoven fabric, a known method, for example, the method described in JP-A No. 7-166463 can be applied as it is.

Warp yarn 2 of the plain weave support net used in the present invention
The relationship between the weft thread 3 and the weft thread 3 is shown in FIG. The absolute value of AB is 15
If it is smaller than 0 μm or larger than 400 μm, the pattern of apertures generated by the high pressure water column flow treatment is not staggered, which is not suitable. That is, when a spunbonded non-woven fabric is placed on the plain weave support net 1 and a high pressure water column flow is applied so as to penetrate from the surface of the non-woven fabric, the knuckle portion of the support net 1 shown in FIG. The long fibers existing above are spread by the high-pressure water column flow, and an open hole pattern is generated at the position corresponding to the knuckle portion. In this case, the maximum height (A) of the knuckle of the warp yarn 2 and the knuckle of the weft yarn 3 are Even if the difference in absolute value of maximum height (B) is smaller than 150 μm,
Even if the size is larger than 0 μm, holes are formed even in the knuckle portion with a relatively low X, so that a lattice-shaped hole pattern is exhibited, and thus a clear staggered hole pattern cannot be obtained. The maximum height of the knuckle was measured by the following method. That is, the same mesh as the support mesh used is 10 mm.
Cut into a size of 10 mm, put on a slide glass after gold vapor deposition treatment, and use a laser microscope (1LM11, controller 1ZC1 manufactured by Lasertec Co.) to determine the maximum height A of the knuckle of the warp and the maximum knuckle of the weft. Height B was measured in μm. Measurement is 10 mm x 10 mm
Each sample was subjected to 3 samples of 3 points in length and 3 points in width, and averaged.

In the present invention, the reason why the spunbonded nonwoven fabric is provided with lateral elongation by the high pressure water column flow treatment is that, as described above, a part of the heat-bonded area of the nonwoven fabric is destroyed by the high pressure water column flow. This is because some of the long fibers constituting the non-woven fabric are also cut, so that the degree of freedom of each fiber is increased and the fibers easily move with respect to an external force. Second, even if the long fibers that make up the non-woven fabric are not cut by the high-pressure water column flow, they will be pushed in the thickness direction of the non-woven fabric and the fibers will become entangled with each other. This is because the fibers arranged in the above-mentioned manner try to be arranged again in the lateral direction. Thirdly, the high pressure water column flow imparts a zigzag pattern of holes to the nonwoven fabric. That is, when a zigzag open hole pattern is imparted to the spunbonded nonwoven fabric, as shown in FIG. 3, in any cross-section (XX 'line) in the transverse direction at right angles to the flow direction of the nonwoven fabric, the spunbonded nonwoven fabric is exposed to any position. Due to the existence of the open hole portion 4, when an external force in the lateral direction of the nonwoven fabric acts,
Lateral elongation due to the deformation of the aperture 4 is likely to occur.

On the contrary, the difference between the maximum height (A) of the knuckle of the warp thread 2 and the maximum height (B) of the knuckle of the weft thread 3, A
When the lattice-shaped aperture pattern is given to the spunbonded nonwoven fabric with -B less than 150 μm, the aperture portion 4 does not exist at all in the cross section (YY 'line) in the width direction of the nonwoven fabric as shown in FIG. A portion appears, and the lateral extension property due to the above-mentioned first and second reasons is developed in that portion, but the lateral extension property is not obtained by the deformation of the opening portion 4, and a staggered opening pattern is obtained. Different from the case where is added, the lateral elongation is inferior.

The spunbonded non-woven fabric which has been subjected to the high pressure water column flow treatment as described above is dried by a dryer and wound. In the obtained spunbonded non-woven fabric, a part of the self-bonding area is destroyed, and the long fibers composing the non-woven fabric are entangled with each other, and a part thereof is cut, so that the external force of each fiber is applied. It has a high degree of freedom and, in addition, a staggered pattern of perforations is provided, so the perforations are easily deformed by external forces, and therefore, a large lateral elongation is exhibited in the spunbond nonwoven fabric due to these synergistic effects, In particular, the lateral elongation of the nonwoven fabric is 50 to 200% when a load of 1 kgf / 100 mm is applied in the lateral direction of the nonwoven fabric. The non-woven fabric thus obtained is then processed, if necessary, and used for sanitary materials, medical base materials, industrial base materials and the like.

[0020]

EXAMPLES The present invention will be described more specifically with reference to examples below, but the present invention is of course not limited to these.

Example 1 Polypropylene (PP) continuous filaments are accumulated,
In addition, a spunbonded nonwoven fabric having self-bonding areas in which long fibers were fixed to each other by melting and solidifying PP was prepared. The area of each self-bonding area of this spunbonded nonwoven fabric was 0.28 mm ² , and the total of the self-bonding area was 7 area% of the surface area of the spunbonded nonwoven material. The fineness of the long fibers constituting this spunbonded nonwoven fabric was 2.3 denier, and the basis weight of the spunbonded nonwoven fabric was 25 g / m ² . Next, this spunbonded non-woven fabric was placed on a plain weave support net having an absolute value of 320 μm of the maximum knuckle heights of the warp yarn and the weft yarn shown in FIG. Nozzle diameter is 0.15 mm, pitch of nozzle holes is 1.4 mm, 5 nozzles with 714 holes per nozzle are arranged in the flow direction of spunbonded nonwoven fabric, and spunbonded nonwoven fabric is at a speed of 30 m / min. While moving with, a high-pressure water column flow was ejected from the nozzle to penetrate through the surface of the spunbonded nonwoven fabric. At this time, the water pressure is set to 150 so that the specific energy given to the spunbonded nonwoven fabric by the high-pressure water column flow ejected from one hole of the nozzle is 1 × 10 ⁻³ kwh / kg.
It was set to kg / cm ² . Next, the spunbonded non-woven fabric after the high pressure water column flow treatment was dried with a dryer. The spunbonded non-woven fabric after drying was tested for extensibility, flexibility and formation by the following test methods to evaluate quality.

Test method (1) Elongation: According to the method specified in JIS L 1906, 10
A non-woven fabric with a width of 0 mm and a width of 200 mm is sampled in the transverse direction, and a load is applied in the transverse direction of the non-woven fabric to 1 kgf / 1.
The elongation (%) of the nonwoven fabric when a load of 00 mm was applied was measured and defined as the lateral elongation. (2) Flexibility The flexibility of the nonwoven fabric was evaluated by sensory evaluation. Evaluation is monitor 20
It was conducted by a person and evaluated on the basis of the following 5 grades, and the average (point) was calculated and shown by a numerical value with one digit below the decimal point. 5 ... Extremely soft compared to untreated non-woven fabric. 4 ... Softer than untreated nonwoven fabric. 3 ... Slightly more flexible than untreated nonwoven fabric. 2 ... Almost the same as the untreated nonwoven fabric. 1 ... Exactly the same as the untreated nonwoven fabric.

(3) Formation The formation of the produced nonwoven fabric was visually evaluated. The evaluation was carried out by 20 monitors, and the evaluation was performed according to the following 5 grades, and the average (point) was calculated and shown by a numerical value with one digit below the decimal point. 5: The opening pattern is extremely clear. 4 ... A clear aperture pattern. 3 ... The opening pattern is slightly unclear. 2 ... The aperture pattern is unclear. 1 ... The pattern of apertures is extremely unclear.

Comparative Example 1 The spunbonded non-woven fabric used in the examples before being subjected to the high-pressure column flow was evaluated as it was.

Comparative Example 2 The specific energy applied to the spunbonded nonwoven fabric by the high pressure water column flow ejected from one hole of the nozzle was 4 × 10 ⁻³ kwh /
A spunbonded non-woven fabric was obtained and evaluated in the same manner as in Example 1 except that the water pressure was 207 kg / cm ² and the treatment rate was 12 m / min so that the pressure became kg.

COMPARATIVE EXAMPLE 3 A high pressure water column flow ejected from one hole of a nozzle spun
The specific energy applied to the nonwoven fabric is 0.1 × 10^-3kw
The water pressure is 33 kg / cm so that it becomes h / kg. ^TwoAnd
Except for the above, spunbonded nonwoven fabric was prepared in the same manner as in Example 1.
Was obtained and evaluated.

Comparative Example 4 The spunbonded non-woven fabric used in Example 1 before the high pressure water column flow was made of 25 mesh, and the absolute value of the absolute value A-B of the maximum heights of the knuckles of the warp yarn and the weft yarn of FIG. 2 was 100 μm. Was placed on a plain weave support net, which was subjected to a high pressure columnar flow treatment in the same manner as in Example 1 to obtain a spunbonded nonwoven fabric having a clear lattice-shaped opening pattern and evaluated.

The results obtained are shown in Table 1.

[0029]

[Table 1]

As is clear from Table 1, the spunbonded nonwoven fabric (Example) of the present invention showed high lateral elongation even under a low load, and had good flexibility and texture. On the other hand, the untreated spunbonded nonwoven fabric (Comparative Example 1) showed almost no lateral elongation under low load and was inferior in flexibility and texture. Even with spunbonded non-woven fabric that has been subjected to high-pressure water column flow treatment, if the specific energy given to the non-woven fabric by the high-pressure water column flow ejected from one hole of the nozzle is too large (Comparative Example 2), the strength of the spunbonded non-woven fabric obtained will decrease. However, the lateral elongation under a low load could not be measured. On the other hand, if the specific energy is too small (Comparative Example 3), the amount of lateral elongation is small and it is extremely inferior. In addition, the spunbonded non-woven fabric having a lattice-shaped opening pattern (Comparative Example 4) has good flexibility and texture, but has poor lateral elongation under low load.

[0031]

As described above, the present invention has the effect of providing a spunbonded nonwoven fabric which is excellent in flexibility and formation and has excellent lateral elongation of the nonwoven fabric under a low load, and a method for producing the same. .

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a support net used in the present invention.

FIG. 2 is a schematic sectional view of a support net used in the present invention.

FIG. 3 is a schematic view of a staggered aperture pattern suitable for the present invention.

FIG. 4 is a schematic view of a lattice-shaped opening pattern which is not preferable in the present invention.

[Explanation of symbols]

 1: Supporting net 2: Warp yarn 3: Weft yarn 4: Opening part A: Maximum height of knuckle part of warp yarn of supporting net B: Maximum height of knuckle part of weft yarn of supporting net

Claims (3)

[Claims] 1. A spunbonded non-woven fabric having a regular and intermittent self-fusion area composed of continuous filaments obtained by melt-spinning a thermoplastic resin, wherein the continuous filaments are entangled with each other and self-fused. When a part of the area is destroyed, the non-woven fabric has a clear staggered opening pattern, and when a load of 1 kgf / 100 mm is applied in the transverse direction which is perpendicular to the flow direction of the non-woven fabric, the non-woven fabric shows 50-200% of the area. A spunbonded non-woven fabric having lateral stretchability. 2. A support surface for collection, wherein a thermoplastic resin is heated and melted, extruded from a spinneret and spun, and the spun continuous filament filament group is drawn by an ejector while being drawn with high-speed high-pressure air, opened, and collected. A method for producing a spunbonded non-woven fabric by collecting the above to form a web and subjecting the web to a thermocompression bonding treatment to provide a self-fusion-bonded region, wherein a spunbonded non-woven fabric having the self-fusion-bonded region is formed into a support network And the maximum height A of the protruding portion caused by the weft thread being positioned below the warp thread and the maximum height B of the protruding portion caused by the warp thread being positioned below the weft thread. The absolute value of the difference A-B is placed on a plain weave support net having an absolute value in the range of 150 to 400 μm, a high-pressure water column flow is applied from the surface of the nonwoven fabric, and the continuous long fibers constituting the nonwoven fabric are entangled with each other, and at the same time, Part was cut, and the self-bonding part of the area physically destroying the method for producing a spunbonded nonwoven fabric and providing a sharp staggered openings pattern on the nonwoven fabric. 3. When a high-pressure water column flow is applied from the surface of a spunbonded nonwoven fabric, the specific energy imparted to the nonwoven fabric by the high-pressure water column flow ejected from one hole of a nozzle is 0.5 × 10 5.
^{-3 to} 3 x 10 ^-3 kwh / kg is in the range, and the method for producing a spunbonded nonwoven fabric according to claim 2, characterized in that.