JPH0361788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a nonwoven fabric.

More specifically, the present invention relates to a method for producing a nonwoven fabric that is made of continuous fibers that have particularly low anisotropy and excellent thickness uniformity, and has a number of industrially excellent features.

[Conventional technology]

Conventionally, nonwoven fabrics made of short fibers, ie, staples, are well known. However, synthetic fibers and other fibers must be manufactured separately, and must be crimped, oiled, and cut into short lengths, and when used as nonwoven fabrics, they must be run through a spinning machine and then carded. There were problems that could not be avoided, such as having to go through a very elaborate process, requiring extremely large air lay equipment such as a wind tunnel, and having high unevenness and non-uniformity. .

Furthermore, when intertwining a thick uniform non-woven fabric, even if the intertwining is done later using a needle punch or waterjet punch, it is especially important to create a thin web to prevent overlapping marks. Then, it was necessary to stack more than 50 or 60 sheets, which required a very inefficient process. For this reason, it has many problems, such as being very expensive, having low strength due to the use of staples, and having a lot of fuzz.

For this reason, a method called spunbond, etc., was developed to directly produce fiber sheets from spinning.

Such methods have some degree of effectiveness and have seen great development in recent years. However, it had many drawbacks and problems. This can be seen from the surprising number of improvement studies and patent applications for improvements.
If there were no problems, these things would not be necessary.

The following points are listed as problems.

[Problem to be solved by the invention]

(1) Unevenness: In order to spread the fiber from the spinneret and make it into a sheet, multiple spindles are lined up to form a sheet with an industrially required width of, for example, 1 to 5 meters. It had the fatal drawback that it was impossible to reduce the unevenness due to turbulent flow of fluids and mutual repulsion and attraction due to electrostatic charges, which have not been solved even in modern times.

(2) Investment: Large-scale investment was necessary due to the arrangement of multiple spindles. The capital investment was more than necessary. The wider the width, the greater the degree. If there was enough demand, there would be no problem, but if it could not keep up, it would lead to excess equipment and higher costs.

(3), (4) Workability: Yield: In this case, changing the width became very troublesome, and also resulted in large ear cutlets, resulting in large losses. Furthermore, stopping or moving a particular spindle was surprisingly troublesome for those who were familiar with the actual state of spinning. This 2
This was a serious problem.

(5) Ear loss and non-uniformity of the ears: In addition, there is still poor uniformity in terms of quality, especially since the ears hit the edge of the machine, the layering of the ears is not uniform, and many are disposed of as ear cutlets. This was one of the major causes of yield decline. Analysis of many commercially available products confirms this.

(6) Anisotropy: In the so-called spunbond method, which involves direct connection from spinning, a serious problem is that the product (sheet) is difficult to stretch in the direction of the machine, that is, in the machine direction, but easily stretches in the transverse (width direction) direction. Had to have. This is because when the fibers are blown onto a belt conveyor and collected, the belt moves forward, causing the fibers to be pulled. Due to jet punching, etc., the sheet is stretched, and the fibers are increasingly aligned in the longitudinal direction, making the anisotropy even worse.

(7) Width change: Direction of basis weight: Although there are various market demands, this is regulated by the spinning equipment itself, so the degree of freedom is extremely low. It was not possible to freely change the width or basis weight without stopping the spinning machine. Furthermore, when creating a high basis weight, the web that was first taken and sprayed interfered with the suction of the underlying net, preventing uniform fiber deposition and making it impossible to form a good web. On the user side, there was also cutlet loss, and this was due to the fact that products with the exact standard width could not be obtained at a low price, and this went against the demands of the era of rational low-cost production through order-making.

(8) Flexibility: Entanglement: Conventional nonwoven fabrics have poor flexibility and are weak in entanglement, and when the fineness is made, the needles of the needle punch may break, and when the fineness is normal, the needles of the waterjet punch may break. It was not effective and did not result in a good nonwoven fabric.

(9) Overall yield: The various drawbacks mentioned above ultimately resulted in the drawback of significantly lowering the overall yield.

The present invention aims to solve the above problems.

In particular, it has excellent uniformity, no anisotropy, flexibility in width setting and basis weight setting to meet rapidly changing market demands, no need for large-scale investment all at once, and no overproduction. The aim is to avoid inventory adjustments due to production costs, to avoid cost increases due to fixed costs due to reduced production, and to minimize ear losses.

Other purposes will become clearer in the description below.

[Means to solve the problem]

As a result of long-term intensive studies regarding these problems, the present inventor finally arrived at the method for producing a nonwoven fabric of the present invention.

The present invention is an innovative one that exploits the conventional blind spot, and its gist is as follows.

(1) Directly connected to a spinneret for manufacturing synthetic fibers, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous overlapping web. A method for producing a nonwoven fabric characterized by the following.

(2) Directly connected to a spinneret for manufacturing synthetic fibers, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous overlapping web. The method is to take in the fiber filament with an air stream at high speed, blow it against the reflective collision surface, move the reflective collision surface repeatedly, and gradually increase the fiber filament near both ears to the moving surface that collects the fibers as a web. Claim 1 is characterized in that a continuous web with a cross-sectional distribution that decreases in the direction of the direction is produced, which is then led to a cross lapper to form a continuous web with a very small overlapping angle. Method of manufacturing nonwoven fabric.

(3) The method for producing a nonwoven fabric according to claim 1, wherein the webs are stacked while pressing the webs.

(4) Directly connected to a spinneret for producing synthetic fibers, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous overlapping web; A method for producing a nonwoven fabric, which comprises subsequently needle punching and/or waterjet punching to divide the fibers.

(5) Directly connected to a spinneret for manufacturing synthetic fibers, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous overlapping web. The method is to take in the fiber filament with an air stream at high speed, blow it against the reflective collision surface, move the reflective collision surface repeatedly, and gradually increase the fiber filament near both ears to the moving surface that collects the fibers as a web. Claim 4 is characterized in that a continuous web with a cross-sectional distribution that decreases in the direction of the direction is produced, which is then led to a cross lapper to form a continuous web with a very small overlapping angle. Method of manufacturing nonwoven fabric.

(6) The method for producing a nonwoven fabric according to claim 4, wherein the conjugate fiber is a sea-island type conjugate fiber filament having an island component number of 50 or more.

(7) The number of divisions is 10 or more, and the divided fibers are
The method for producing a nonwoven fabric according to claim 4, which has a denier of 0.2 denier or less.

(8) The number of divisions is 50 or more, and the divided fibers are
The method for producing a nonwoven fabric according to claim 4, wherein the nonwoven fabric has a denier of 0.06 denier or less.

(9) The method for manufacturing a nonwoven fabric according to claim 4, wherein the webs are stacked while pressing the webs.

[Effect]

The present invention will be explained in detail below.

As already mentioned in the previous problems section, it is known that the fibers are drawn off at high speed directly from spinning using air suction.

The first point of the present invention is as follows.

In other words, whereas the conventional technology found its rationality in direct fabrication, this method combines a cloth wrapper with a cloth wrapper, which is apparently extremely anachronistic and goes against the grain. It is in. There may have been a lot of ridicule and criticism, but the grounds for saying it's good and the grounds for criticism are as follows. First of all, the basis of criticism is the unevenness in the required number of cross slugs, their slow speed, and their low productivity. Even though it has been spun with high productivity, the question is whether it is possible to repeat the process of layering many sheets to make a uniform web similar to the conventional web made by carding short fibers, and even if it were possible, the number of sheets would be large. It seems that the criticism was that there was no point in combining it with direct spinning. In other words, these criticisms are enough to infer that such a thing had never been thought of before the present invention, and even if it were assumed, there would be no expected merit.

However, if you think about it more deeply, the web that comes out of a conventional stapling card machine or similar machine can be simply expressed as the fibers of the web in a cross section (a cross section perpendicular to the machine direction). The distribution can be said to be "rectangular" with a uniform basis weight in the ears. This can be easily understood by those skilled in the art since the conventional mechanism of card machines is aimed at achieving uniformity in the width direction. Therefore, as the essence of Cross Ratspur,
As the fiber web is repeatedly stacked back and forth and the laminate is moved, it progresses at a certain stacking angle, resulting in "streaks" corresponding to the stacking, resulting in unevenness and streak defects. It becomes a non-woven fabric. In order to avoid this, the webs produced by conventional short fiber cards or equivalent web making machines are made as thin as possible before they are stacked, and they are stacked at high speed (from a productivity standpoint) to produce 50 sheets or so. It was customary to stack as many as 60 sheets to avoid unevenness caused by cross-lap. However, the method defined in the present invention, namely, web collection, in which the spun fiber filament is taken up by an air stream at high speed, it is blown against a reflective collision surface, and the reflective collision surface is repeatedly moved to reduce the amount of fiber to move the fibers. If you create a continuous web with edges on the surface, like the base of Mt. Fuji, the shape of the base of Mt. Fuji will vary from extremely thin to extremely gradually thick, compared to the uniform web of the conventional "rectangular" model. After gradually increasing in height and having a certain spread of basis weight, it gradually becomes thinner again toward the other ears, and has an extremely thin distribution. For this reason, what is surprising is that the cross laps do not overlap in a step-like manner as in the case of rectangles, but rather have extremely smooth overlaps, so even if the number of overlapped sheets is small, it shows a step-like uneven stacking state. It must be noted that he skillfully uses the unique and important knowledge that there is no such thing.

The second point to note is that for this purpose, the continuous fiber web with very gentle ends is made by applying the air-pulled fibers at high speed to a reflecting plate or reflecting surface, and repeatedly swinging the direction of the reflecting plate or reflecting surface. The unique method of dispersing the particles is extremely effective and forms a web with a gentle, even, chevron-shaped distribution of ears. In order to make this distribution more effective, the fibers can be charged, forcibly charged, or tribo-electrified to take advantage of electrostatic repulsion, resulting in a more even and uniform center area and It can be a gently tapered selvedge web.

The third point is that the fibers constituting the nonwoven fabric thus obtained are further divided into 10 or more parts after the web is formed, and spread out, making the nonwoven fabric even more uniform and more flexible.
In particular, fibers of 0.2 denier or less become softer and more uniform. There is no need to explain the splittable conjugate fiber in detail here, and the splitting method and peeling method are well known, so they will not be described. However, the present invention is not limited thereby.

There is no need to explain the sea-island type composite fibers, polymer mutually arrayed fibers, etc. that will be described later, as they are well known in the art and will not be explained here, but they should not be construed as limiting. do not have. With needle punches, the thinner the fibers are, the more difficult they are to move, and the harder they are to slip, resulting in needle breakage, a tactile structure, and a structure with less fiber movement, but with waterjet punches, the thinner the fibers are,
Effective movement, preferably 0.2 denier or less, especially
A denier of 0.06 denier or less is particularly preferable. Furthermore, when the sea component is removed by water jet punching, the two combine to produce extremely effective results. It should be noted that the composite fibers of the present invention, that is, relatively thick fibers, can be needle punched. It should be noted that the waterjet punch is processed when or when it can be attenuated. The present invention satisfies both requirements. Fibers that generate ultrafine fibers include, for example, polymer interlayer array fibers. It is generally an island-in-the-sea type fiber, and its cross section does not break or change from time to time as in polymer blends, but is continuous for a long time without substantially changing. In the present invention, it is particularly preferable that the sea component is soluble in water or hot water. It also includes island components of polymer mutual arrays that have become further polymer mutual arrays. Since the ultrafine fibers are entangled with each other, the number of islands is preferably 50 or more, particularly 100 or more. In addition, although the upper limit is possible up to about 10,000, it is preferably 1,000 or less, especially when increasing the ratio of sea components to island components.
500 or less. The island/sea component ratio is preferably 75% or more, particularly preferably 85% or more, and is water-soluble. In any case, it is preferable to remove intervening components such as sea components. In the present invention, the basis weight distribution at the edge of the web before crosslap decreases like a gentle slope toward the edge, so depending on the polymer component, it may be difficult to apply it to the crosslap machine. At that time, it is preferable to spray water or water containing an antistatic agent onto the web in the form of a mist. however,
There should not be too many.

Further, as for the type of cross wrapper, a type that cross wraps while constantly pressing down on the web is particularly preferable. As this type of cross wrapper, the famous cross wrapper manufactured by Aslan, Slans, is the most preferred type for carrying out the method of the present invention, since the layered web is repeatedly pressed onto a conveyor that carries the web while the layering is progressed. Moreover, this type of cross-lapper has a fast overlapping speed,
In addition, there is no disturbance of the web due to the generation of wind that accompanies the unavoidable reciprocating movement, and the web is held down, so it is stable. The method using a cross lapper has the great advantage of being able to control the width extremely reliably and having little loss. Compared to the conventional method of stopping the flow of blown fibers with side walls and thereby controlling the width, the uniformity of the fabric weight near the ears is much better. Moreover, the outstanding feature is that the width can be set extremely easily, and the width can be changed without changing the spinning conditions or stopping a particular spindle. By taking full advantage of the fact that the cross-wrap speed can be easily changed, the width can be changed, and the number of layers can be changed, it is extremely easy to meet market demands for meeting cross-wrap conditions without changing the spinning process itself. These excellent features can be achieved in combination with this web shape.

Through this special combination of laminating layers using a unique web and cross wrappers, we have succeeded in demonstrating a number of unprecedented features, effects, and new rationality, but mass production using a large number of spindles is not possible. Some may question whether this is the case.

However, in the present invention, it is possible to use a wide cross-rupper conveyor belt to provide two spindles, but this poses a new problem in that it is not possible to sequentially increase the number of belts. In the present invention, since the area after the cross lapper is originally wide, it is possible to change the width. easily achieved. That is, a unique effect of the present invention is that it is possible to successively expand the number of units by modifying the chiller to make it a little longer and adding one set of previous equipment.
In the so-called spunbond method, if you try to place an additional web on top of the web that has been picked up with air, the previous web will blow away when the next web is deposited, which is a serious problem. Although there are drawbacks,
In the present invention, since the cross-lap is carried out on top of the cross-lap, it can be carried out without any problems, so it is possible to expand the width and increase the capacity.Also, it is possible to increase the capacity by increasing the speed of the lattice and the speed of the conveyor. is also possible. In any case, the initial web shape of the present invention plays an extremely important role in combination with the present cross wrap.

Based on the above configuration, the relationship with the purpose of the present invention (problems to be solved) can be further summarized as follows.

(1) The unevenness is due to the fact that the unique web of the present invention was successfully cross-wrapped, making it extremely uniform even with a small number of webs. It has much more uniformity than the conventional method which changed from multiple spindles to wide width all at once. Furthermore, since they are made of long fibers, the strength of webs and entangled bodies is much higher than that of staples.

(2) Depending on the market, investment can be expanded from one spindle to multiple spindles one by one. The width and thickness can be adjusted freely. Unlike in the past, there is no need to invest in a spinning device for several meters of width at once.

(3) Workability: The width and speed of the cross lapper and the speed of the lattice and conveyor that receive and transport the laminated web can be changed very easily, making the work extremely easy and highly workable. In addition, there is no need to remove or attach a specific spindle during spinning, there is no need to stop the machine, and there is extremely little loss, allowing you to move on to the next quality or spec such as width, thickness, or basis weight. be able to.

In this way, the workability is much higher than that of the conventional method.

(4) The yield is also extremely high. The goal is to achieve high yields by eliminating ear loss, switching loss, machine stoppage loss, no loss due to partial removal of the machine, and low loss due to quality margins due to high uniformity. made possible.

(5) Regarding ear loss and unevenness of the ear portion, the web is mechanically bent, and the web is bent correctly at a certain position, so the ear loss is extremely small. Although it may be necessary to cut only a small amount, it is still extremely rare. Moreover, it is even rarer to use the method of folding while pressing down.
Regardless of the unstable principles caused by conventional static electricity and fluid turbulence that cause severe unevenness, and because the machine uses the cross-lapper principle, the unevenness is minimal and even near the ears.

For this reason, the loss of the ears was extremely small, and the unevenness of the ears was substantially resolved.

(6) Anisotropy could be significantly reduced. The continuous fibers taken at high speed are reflected by the reflective surface, and when the continuous fibers are scattered and deposited, the collection surface is moving, so the fibers are collected on the collection belt (or lattice, which is used hereinafter with the same meaning). The particles inevitably align in the direction of the machine direction, resulting in anisotropy. It will be appreciated that because the fibers are continuous fibers, they tend to be more stretched and aligned in the machine direction (machine direction).

However, in the present invention, since the web is folded substantially in the transverse direction, the anisotropy in the longitudinal direction changes to the anisotropy in the transverse direction. However, the laminated web produced by the cross lattice is difficult to control in subsequent processes, such as the transition from lattice to needle punching, the tension during needle punching, and the tension during winding.
In exactly the same way, when transitioning to waterjet punching, the anisotropy in the lateral direction changes to the anisotropy in the longitudinal direction as it is stretched by various process tensions, such as the tensions before and after, and the tension during winding. It is precisely balanced according to the various conditions that occur, and provides a nonwoven fabric with extremely low anisotropy.

If there is a shortage, it can be easily stretched vertically.

From these, you will understand how this method provides an excellent nonwoven fabric.

(7) It has already been mentioned that changing the width is extremely easy as it is only necessary to change the reaction point of the reciprocating motion of the cross rattuper machine.

Furthermore, the basis weight can be changed even more easily by simply reducing the moving speed of the lattice on the side that receives the laminated web of the cross lapper.

(8) Regarding flexibility, when using the above-mentioned special fibers that can be divided into a large number of fibers, the fibers become ultra-fine fibers, ultra-fine fibers, and even ultra-super-fine fibers, so they are extremely flexible.

Here, I would like to specifically explain the secret to improving the bending characteristics (wrinkles, etc.) of nonwoven fabrics and their processed products and giving them flexibility.

This is especially true for long-fiber woven fabrics, which should be kneaded. Adding transformation later and adding transformation first seem to be the same at first glance, but
In long-fiber nonwoven fabrics, since the fibers are connected, the fibers on the surface side tend to become tensioned, resulting in a surface-tensioned nonwoven fabric structure. When this is kneaded, the fibers on the surface stretch, and the fibers on the surface change into a relaxed nonwoven fabric. After that, you can stretch it to smooth out the wrinkles or press it if necessary. The concept of surface-relaxed nonwoven fabrics, even when pressed to further smooth out wrinkles, is changing.

Further, since there is no anisotropy, the entanglement is uniform, and when ultra-superfine fibers, ultrafine fibers, and ultrafine fibers are entangled, they are even more entangled by waterjet punching. In particular, in the present invention, it is particularly preferable to perform waterjet punching after needle punching. After entanglement, the intervening components are removed to form ultrafine fibers, resulting in a flexible nonwoven fabric with a highly entangled structure. During needle punching, it is highly preferable to apply a slippery oil to the fibers. Alternatively, it is preferable to mix a slippery component with a composite component or a sea component.

In addition, it is particularly preferable to heat the web to 40°C or higher.
It is preferable to perform needle punching in a high temperature state by heating in a range up to 100°C. When using a water jet punch, it is preferable to use a columnar water jet rather than a spray jet. Particular preference is given to pressures of 70 to 150 kg per parallel centimeter.
The water temperature for the long fibers is particularly preferably 30 to 60°C. It is particularly preferable to perform water jet punching with controlled warm water at 45 to 60°C. Copolymers of terephthalic acid, isophthalic acid, 5-sodium sulfoisophthalic acid and ethylene glycol, and those copolymerized with polyethylene glycol, use one component such as a sea component that dissolves in high-pressure water or high-temperature water. It is particularly preferable when the fiber is a conjugated fiber.

Although additives are not necessarily required, it is particularly preferred to add polyalkyl ethers or compounds thereof.
This is because the entanglement effect of long fibers is increased. In order to increase the entanglement effect, it is preferable to squeeze the water well with a roll or the like just before the water jet punch, especially when using multiple stages. This is because if the surface of the web is covered with water, the effectiveness of the next water jet will be reduced. Therefore, when using a waterjet punch, it is preferable to pull the water from below with a suction to remove the water quickly, as this is a method for effective entanglement.

Preferred island components include polybutylene terephthalate, copolymers thereof, esters such as polyethylene terephthalate, nylon 6, 66, 610,
various nylons, polyolefins such as polyethylene and polypropylene, elastic polyurethanes, copolymers of polytetramethylene glycol and amide or ester, urethane, etc. to provide elasticity, and even sheaths made of polyethylene,
A core/sheath fiber combination in which the core is made of polypropylene or the like is preferred. It is used in appropriate combinations of polymers for purposes such as fusion, high color development, dyeability, adhesion, and hydrophilicity. Combinations of these can be easily devised by those skilled in the art. Moreover, it is also easy to carry out three-component spinning. Intervening components during composite spinning include:
Different types of polymers can be appropriately selected from known polymers, such as polyester-based polymers that are soluble in water and alkaline solutions, nylon-based water-soluble polymers, and polyalkylene glycol-based polymers. .

〔Example〕

Examples will be shown next, but the present invention will not be construed as limited or the effectiveness of the present invention will be impaired by these examples. If anything, it will bring about the next expansion and development.

Example 1 The spinning temperature was 290°C, the number of islands was 433, and nylon 6 was used as the island component, and the sea component was a polymer soluble in impact water and hot water, and polyethylene terephthalate was combined with an isophthalic acid component and a 5-sodium sulfoisophthalic acid component. A copolymerized polymer with an island content of 85% is drawn as 24 filaments at high speed through an ejector nozzle, and is applied to a diagonally arranged metal surface, at the same time swinging the angle of the surface. and collected it on a conveyor belt wire mesh. The width reached approximately 120cm, and the center part showed a nearly uniform basis weight, but the basis weight decreased toward the ears in both ear directions, and like the foot of a gentle normal distribution curve, the foot shape of Fuji decreased. It was showing.
This was cross-wrapped to a width of 58 inches using a high-speed cross-wrapper modeled by Aslan (France), which overlapped while pressing, and the number of sheets stacked was 20. Although this was an unusually insufficient number of layers, which would cause unevenness in ordinary card webs, it formed a very beautiful cross-lap web with well-aligned edges. This one is about 120
Although the web had a basis weight of g/m ² , it was a beautiful web. It was lightly needle punched at a needle density of 50 needles/m ² and then waterjet punched. The water jet punch was a swinging type, and the impact was performed using a 0.23 mm diameter nozzle with a 6 mm pitch at a water pressure of 100 kg/cm ² . Although the fibers were long fibers, they intertwined well and became a firm nonwoven fabric. In addition, it was found that the fibers were very soft, very thin fibers, and almost all sea components were removed, indicating that entanglement and removal of sea components proceeded almost simultaneously by waterjet punching.

This material was strong, soft, had little vertical and horizontal anisotropy, and hardly frayed at the edges, making it extremely suitable as a wiping cloth.

〔Effect of the invention〕

The effects have already been fully described in the above explanation along with the action, so the main points will be summarized here.

(1) We succeeded in obtaining long fiber webs and long fiber nonwoven fabrics with extremely low unevenness.

(2) Large-scale investment is not required at once. Sequential investment is possible and sequential expansion is possible.

(3) Workability is excellent.

(4) Yield can be improved.

(5) Ear loss can be reduced.

(6) The ears can be made highly uniform.

(7) Vertical and horizontal anisotropy can be reduced.

(8) Changing the width can be made extremely easy by simply setting the width of the repeated movement of the cross lapper. There was no need to change the number of spinning nozzles or ejectors.

(9) It was possible to easily change the basis weight. [Can be done in one go by changing the lattice speed of the cross lattice, that is, by setting the speed of the drive motor.] (10) Flexible nonwoven fabrics can be obtained all at once.

(11) Overall yield can be increased.

(12) When composite fibers are used in long fiber nonwoven fabrics, entanglement of long fibers and intervening components can be simultaneously removed.

(13) For the first time, we succeeded in providing a method that can skillfully and completely avoid the biggest problem in long-fiber spunbond nonwoven fabrics, which is mutual interference between spindles in the take-up and dispersion of spun fibers.

(14) The difficulty of controlling the selvedges in direct production of long-fiber nonwoven fabrics can be skillfully and completely avoided.

(15) We have succeeded in providing a method that is extremely easy to meet market demands for width and basis weight. For this reason, it is possible to skillfully avoid the disadvantages of fabric making using the long fiber direct spinning method.

(16) We have succeeded in providing a method to provide a well-balanced nonwoven fabric with a marked longitudinal fiber arrangement. Also, intentionally (actively)
Our success in providing a method for producing nonwoven fabrics with high longitudinal elongation is significant in the sense of providing something that has not been possible until now.

Claims (1)

[Claims] 1. Directly connected to a spinneret for manufacturing synthetic fibers, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous layer. A method for producing a nonwoven fabric, characterized by forming a laminated web. 2. A method in which the spun fiber filaments are directly connected to a spinneret for the production of synthetic fibers, the spun fiber filaments are taken over by a high-velocity air stream, the fibers are collected as a web, and then they are guided to a cross wrapper to form a continuous overlapping web. However, the fiber filament is taken up by an air stream at high speed, and the fiber filament is blown onto the reflective collision surface, and the reflective collision surface is moved repeatedly. The nonwoven fabric according to claim 1, which produces a continuous web with a cross-sectional distribution that decreases toward the end and then guides it to a cross wrapper to form a continuous web with a very slight overlap angle. Production method. 3. The method for producing a nonwoven fabric according to claim 1, wherein the webs are stacked while pressing the webs. 4 Directly connected to a spinneret for synthetic fiber production, the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then guided to a cross wrapper to form a continuous overlapping web, and then to a needle. A method for producing a nonwoven fabric, which comprises dividing fibers by punching and/or waterjet punching. 5. A method in which the spun fiber filaments are directly connected to a spinneret for producing synthetic fibers, and the spun fiber filaments are taken up by a high-velocity air stream, the fibers are collected as a web, and then they are guided to a cross wrapper to form a continuous overlapping web. However, the fiber filament is taken up by an air stream at high speed, and the fiber filament is blown onto the reflective collision surface, and the reflective collision surface is moved repeatedly. The nonwoven fabric according to claim 4, which produces a continuous web with a cross-sectional distribution that decreases toward the end and then guides it to a cross wrapper to form a continuous web with a very slight overlap angle. Production method. 6. The method for producing a nonwoven fabric according to claim 4, wherein the conjugate fiber is a sea-island type conjugate fiber filament having an island component number of 50 or more. 7 The number of divisions is 10 or more, and the divided fibers are
The method for producing a nonwoven fabric according to claim 4, which has a denier of 0.2 denier or less. 8 The number of divisions is 50 or more, and the divided fibers are
The method for producing a nonwoven fabric according to claim 4, wherein the nonwoven fabric has a denier of 0.06 denier or less. 9. The method for manufacturing a nonwoven fabric according to claim 4, wherein the webs are stacked while pressing the webs.