JPS62184171A - Method and apparatus for producing nonwoven web - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for producing a nonwoven web, typically made of synthetic fiber filaments.

More specifically, the present invention relates to a method and apparatus for forming a uniform nonwoven web while overlapping a plurality of fiber groups ejected from a fiber supply device in the web width direction without substantially interfering with each other. The nonwoven web manufacturing method and manufacturing apparatus of the present invention are optimally used when manufacturing a nonwoven web from long fiber filaments or short fiber staples.

[Prior Art] Conventionally, when forming a nonwoven web by suctioning, ejecting, and collecting filaments on a net conveyor using an air flow such as an ejector, it has been attempted to obtain a uniform nonwoven web. Various techniques have been proposed.

That is, there is a method of applying static electricity to a group of filaments and using electrostatic repulsion to spread the group of filaments.
As for the application of static electricity, there are methods using corona discharge and frictional charging. In addition, mechanical opening using collision force or a combination with frictional charging have also been proposed.

Alternatively, a method using a rectangular ejector has also been proposed.

However, according to studies conducted by the present inventors, no matter how many filaments are opened using electrostatic force or collision force, when forming a nonwoven web using multiple ejectors, adjacent ejectors etc. Groups of filaments ejected from adjacent spindles (hereinafter referred to as adjacent weights) interfere with each other and become entangled, reducing the uniformity of the nonwoven web and generating nonuniform web rings in the width direction of the nonwoven web. That is, a so-called enemy-like vertical stripe-shaped web ring is generated in the length direction of the nonwoven web.

In order to solve this problem, there are methods to increase the distance between adjacent weights, to alternately arrange the positions of adjacent weights in a staggered manner, or to arrange filaments from adjacent weights between adjacent weights. Methods of providing partition plates so that they do not come into contact with each other and techniques that combine these have been considered or proposed.

However, in the method of widening the basis weight interval, even if the ejected filament groups are oscillated in the width direction of the nonwoven web, the width that a single spindle can handle in the width direction becomes wider, and each filament group has a difference in spreadability. In this case, hostile web rings are more likely to appear, and the number of spinning spindles (number of ejectors, etc.) per unit width decreases, resulting in poor productivity. If the number of filaments per weight is increased in an attempt to cover this, the opening properties of the filament group will deteriorate, and on the contrary, the uniformity of the entire nonwoven web will deteriorate.

Furthermore, when the spinning spindles (ejectors, etc.) are arranged in a staggered manner, they must be arranged in a staggered manner from the spinneret portion, which inevitably complicates the structure of the spinning block. It is also possible to arrange only the fiber supply devices in a staggered manner, but this would require the filament running direction from the spinneret to the fiber supply device to be oblique to the vertical direction or use a guide, which would impair spinnability. It has the disadvantage of being unstable. However, according to studies by the present inventors, this method generally improves the uniformity of the nonwoven web because filament groups from adjacent spindles overlap.

In addition, regarding the method of inserting a partition plate to block the influence of adjacent weights, in order to restrict the spread of the ejected filaments, the free spread of the ejected filaments is compressed, reducing the uniformity of the nonwoven web, and at the same time, the ejected air flow In order to restrict the spread in the width direction, the ejected airflow flows in the line direction (vertical direction) of the nonwoven web formation, so the ejected filaments are easily arranged in the line direction, which improves the vertical/horizontal characteristics of the nonwoven web. There are problems such as the ratio (characteristic difference) becoming large.

On the other hand, it has also been proposed to use a rectangular ejector to separate a group of filaments ejected in a sagging pattern into two or more ejection directions in the width direction.

However, this method focuses only on increasing the degree of freedom in the width direction of the filaments, and the separated filament groups do not overlap on the collection surface and form a nonwoven web in a single layer. It has also been proposed to separate the filament groups ejected from one ejector, but
This technical idea is the same as when using a rectangular ejector, and there is no technical idea of overlapping adjacent filament groups and trying to obtain a uniform nonwoven web by the effect of overlapping, as in the present invention.

[Problems to be Solved by the Invention] The uniformity of nonwoven fabrics is generally inferior to that of woven fabrics, knitted fabrics, paper, etc., and various proposals have been made as described above regarding techniques for improving the uniformity. However, it is still insufficient and has become an issue for the industry. Vertical/
The balance of horizontal characteristics is also generally poor, and improvements are currently desired.

The present invention aims to solve these conventional problems, and provides a method and a manufacturing apparatus for manufacturing a nonwoven web that has improved uniformity and improved vertical/horizontal property ratio. This is what we intend to provide.

Generally, when a nonwoven web is formed using a large number of m-fiber supply devices using air flow such as ejectors,
The fiber feeding devices are arranged in a row or in multiple rows in a direction perpendicular to the nonwoven web forming line (horizontal direction). In such an arrangement method, a nonwoven web forming method is common in which a collision member is used at the exit portion of the fiber supply device in order to improve the spreadability of the filaments etc. from the fiber supply device. In this method, the spread of the ejected filament groups is generally larger than the basis weight spacing between adjacent filaments, interference occurs between adjacent filament groups, tangles of filament groups occur, and the uniformity of the nonwoven web is This is significantly lower than the nonwoven web obtained by ejecting the air (deterioration in uniformity due to multi-spindle interference).In addition, the spread of the ejected air flow to the left and right is restricted, and it flows in the direction of the nonwoven web forming line. Generally, the vertical/width characteristic ratio of nonwoven webs tends to increase.

The present invention solves the problems in the method of manufacturing a nonwoven web using such a collision member, and provides a method and a manufacturing device for manufacturing a uniform nonwoven web with small vertical/horizontal property differences. That is.

[Means for Solving the Problems] A method for producing a nonwoven web of the present invention that achieves the above-mentioned object includes a method for producing a nonwoven web, which includes a method for producing a nonwoven web, which includes a method for producing a nonwoven web, which includes a method for producing a nonwoven web, which includes a method for producing a nonwoven web that is produced by ejecting fibers from an airflow-utilizing fiber supply device that is arranged substantially in a line in the width direction of the nonwoven web. The resulting fiber bundle is caused to collide with a first-stage collision member to change the ejection direction, and further,
When colliding the fiber bundle with a second-stage collision member to spread it, and collecting the fiber bundle ejected from the second-stage collision member onto a net conveyor to form a nonwoven web, the first
The fiber bundle ejecting center axis direction from the stage collision member is swung in the width direction of the nonwoven web, and the fiber bundle release position from the second stage collision member is moved in the length direction of the nonwoven web to supply adjacent fibers. The nonwoven web is formed by making the ejected fiber groups substantially different for each device and overlapping each other in the width direction of the nonwoven web and collecting them on the net conveyor. A method for producing a nonwoven web, and an apparatus for producing a nonwoven web according to the present invention include a plurality of fiber supply devices that use airflow to suck and eject fiber bundles, and a plurality of fiber supply devices that are provided corresponding to the plurality of fiber supply devices. a first-stage collision member that changes the jetting direction of the fiber group spouted from the fiber supply device; A second method for ejecting fiber bundles at different positions in the longitudinal direction of the web.
This is a nonwoven web manufacturing apparatus characterized by comprising a stage collision member and a net conveyor that collects fiber bundles ejected from the second stage collision member.

[Effect] The present invention will be explained in more detail below.

In the present invention, a fiber bundle sucked and ejected by a fiber supply device using an air flow such as an ejector is caused to collide with a first-stage collision member to change the ejection direction, and then the fiber bundle is transferred to a second-stage collision member. When colliding with a collision member to spread the fibers and collecting them on a net conveyor to form a nonwoven web, the first
The fiber bundle ejecting center axis direction from the stage collision member is swung in the width direction of the nonwoven web, and the fiber bundle separation position from the second stage collision member in the web length direction is substantially adjusted for each adjacent fiber supply device. In contrast, the desired purpose is achieved by ejecting lli fiber bundles and collecting the fiber bundles on the net conveyor.

That is, by swinging the central axis direction of the fiber bundle jet from the first stage collision member, the spread of the fibers γ in the width direction is increased, and the fiber bundle jet from the second stage collision member in the length direction of the nonwoven web is increased. By making the release positions of the 11 ejected fibers different between adjacent fiber groups, collision between adjacent fiber groups is eliminated, and the spread in the width direction of the nonwoven web that is fed by one fiber supply device can be increased without causing interference. ,
However, a nonwoven web is formed by jetting fibers from adjacent spindles so as to overlap in the width direction of the nonwoven web on the collection surface to produce an overlapping effect.

Therefore, the interference between adjacent jet airflows is reduced, so the jet ll! The fiber groups become easier to arrange in the horizontal direction, and the vertical/horizontal waiting ratio is improved.

The fiber feeding device in the present invention uses airflow! l
1li fiber? ', -T is a device that moves the T forward and ejects the fiber U from the tip nozzle. Generally, what is called an ejector or aspirator is used to supply the fiber group, and the spun filaments from the spinneret may be directly supplied to the ejector and ejected by suction, or the fibers may be taken up by a high-speed take-up roller. After that, it may be supplied to the ejector. These generally apply to the formation of a nonwoven web composed of filaments, but the same applies to the case where a sliver of short fibers is fed to an ejector or the like to form a short fiber web. That is, the fiber bundle or group of fibers in the present invention may be either long fiber filaments or short fiber staples, or may be a mixture thereof. In addition, the nonwoven web may be a nonwoven web formed from filaments, so-called spunbond web, or a staple fiber web formed from short fibers.
rQuebu but J, yes. In addition, the fiber material is not particularly limited as long as it is a fiber formed material, such as synthetic fibers such as polyconistyl, polyamide, polypropylene, polyethylene, or copolymers thereof, rayon, cotton, wool, etc. recycled or natural fibers, and inorganic fibers such as glass fibers. Further, composite fibers or a combination thereof may be used.

The functions and effects of the present invention will be explained in more detail with reference to the drawings, but for convenience, the explanation will be centered on the case of the spunpond method in which filaments are formed.

FIG. 1 is a perspective view illustrating one embodiment of the method for producing a nonwoven web of the present invention, in which 1 is a group of filaments discharged from a spinneret or the like (not shown); are substantially aligned in a direction perpendicular to the nonwoven web forming line (direction indicated by the arrow). Note that the arrangement method does not necessarily have to be strictly in a straight line. If it is possible to arrange them somewhat forward and backward, it is possible to set the difference in the contact progress of the ejected fiber bundle on the second-stage collision member with the adjacent spinning hoop of the second-stage collision member, which will be described later, to be small. It can be said that it is possible and desirable. 2 is a fiber supply device, and the figure shows an example of an ejector. Reference numeral 3 denotes a part of the ejector, which is a zone in which the filament is advanced, and usually a pipe with a round cross section is used, but its cross-sectional shape is not particularly limited. Furthermore, before the filament group 1 is supplied to the ejector 2, within the ejector, or after being ejected, electrostatic reaction 1?
A fiber opening technique that utilizes may also be used. Reference numeral 4 designates a first-stage collision member, which is provided corresponding to each weight of the above-mentioned J: eel fiber supply device. 5 is a flexible wire for swinging the first stage collision member 4, and 6 is a drive motor which swings the first stage collision member 4 by a predetermined width by a stepping motor. In such a configuration, the first stage collision member 4 causes the filament groups ejected from the pipe 3 to collide, spread the filament groups μ by the collision force, and open the ficimens 1 to 1 by the frictional electrification caused by the collision. The aim is to break up the u-tight filament group one by one as much as possible, and to spread the ejected filament group in the width direction, that is, in the left and right directions, by swinging. Although the opening effect differs depending on the material of the collision member 4 and the collision force, these conditions may be set appropriately according to the desired nonwoven web. The collision force becomes larger as the collision surface of the first stage collision member 4 and the axial direction of the pipe 3 (filament ejection direction) are closer to a right angle, but if the collision is avoided at a right angle, the filament group will be ejected after the collision. There is a problem that there is no directionality in the direction, making it difficult to collect on the net conveyor, and when the first stage [j projecting member is swung, the ejected filament group does not follow the swiveling direction. It is best to take an angle (as shown by θ in Figure 2) that allows for normal fitting, and as a result of various studies, the angle θ is 10' to 3
It is preferably within the range of 0'.

Further, the contact distance of the ejected filament group on the collision surface of the first stage collision member 4 is preferably 2Q mm or less. If this distance becomes longer, the forward speed of the filament group stalls, the filament group becomes more entangled, the uniformity of the nonwoven web decreases, and the impact force on the second stage impact member decreases, which is not preferable.

Further, the first stage collision member is independently provided on each spinning spindle, is swung left and right around the vicinity of the collision point of the filament group, and also serves to spread the ejected filament group in the width direction. The first-stage collision member may have a curved collision surface or may be provided with a wall blocking the flow of air at the rear in order to stabilize the direction of ejection toward the second-stage collision member. In addition, the method of swinging is not limited to the method shown in the drawings, and the first stage collision member is attached to the tip of the pipe 3.
It is also possible to rotate and reciprocate.

Next, 7 is a second stage collision member, and FIG. 1 shows a state in which it is provided independently for each spindle. 8 is a group of filaments ejected from the second stage collision member 7, and 9 schematically shows the deposition position of filaments nY on the net conveyor. 10 is a net conveyor.

Now, since the angle θ of the filaments ejected from the first stage collision member 4 is small, the ejected filaments are ejected in a state close to parallel to the surface of the net conveyor 10. It is difficult to do this, and even if it were possible, the ejected filament group would be collected in a state close to free fall, so it would be affected by disturbances (turbulence due to air flows other than the air flow ejected from the ejector), and it would not be uniform. It is difficult to obtain a nonwoven web.

In addition, as a method to eliminate interference between adjacent weights, it is possible to change the angle O between adjacent weights, but this is not preferable for the reasons mentioned above, and since the ejected filaments tend to be arranged in the line direction, the length of the nonwoven web is /Horizontal characteristic ratio increases. Therefore, by colliding the filament group ejected from the first stage collision member 4 with the second stage collision member 7, the ejection direction of the ejected filament group is changed to the net conveyor no 10 direction.
Collected as a non-woven web on top. It goes without saying that the second-stage collision also has the effect of opening the filament group, similar to the first-stage collision. The spread of the ejected filament group in the width direction increases with each repetition of the protrusion.

Here, if the set angle of the collision surface of the second-stage collision member 7 and the filament separation position from the second-stage collision member are set to be the same for each spindle, the spread of the filament group ejected from the pipe 3 will be the same. Since the width of the ejected filament group increases as it moves away from the outlet and the first stage collision part shrine 4 is swung left and right, the spread of the ejected filament group in the width direction further increases, and the adjacent filament group colliding with each other on the collision surface of the member 7 or at a location away from the collision member;
This prevents the filaments from interfering with each other and from spreading in the horizontal direction, which causes the filament groups of adjacent spindles to become entangled with each other, reducing the opening properties of the filament groups. Also, if there is a difference in the degree of spread of filament groups between spindles,
There is a problem in that collisions do not occur at the center between the spindles, but instead occur at spindles with a narrow spread, which promotes non-uniformity in the web width direction.In addition, the ejected airflow also interferes with adjacent spindles. Since the filaments do not flow in the horizontal direction (nonwoven web width direction) but in the line direction (vertical direction), the ++r1 filaments are also accompanied and become easier to arrange in the line direction, resulting in a lower vertical/horizontal property ratio. There are problems such as increasing the size of the image.

Therefore, in the present invention, as a specific example is schematically shown in FIG. 1, by appropriately changing the shape etc. of the second stage collision member 7 between adjacent spindles, The fiber bundle separation position of the nonwoven web is shifted in the length direction of the nonwoven web, thereby eliminating interference with adjacent spindles and collecting the ejected filament group at a position different from the collection position of adjacent spindles on the net conveyor. be. Here, it is a preferred embodiment that the central axes of fiber bundle jetting from the second-stage collision members corresponding to each fiber supply device are all substantially parallel.

Next, regarding the size of the swing angle of the first stage collision member, in order to increase the overlap with the adjacent weights on the net conveyor surface, it is preferable that the first swing angle is large, but the ejected filament In order to avoid interference with spindles that collect in the same phase (at the same position in the line direction), one is usually set so that it makes contact with the filament collection head of the adjacent spindle. The rocking direction may be independent for each spindle or may be the same direction for all spindles. Generally, the latter is easier to control. In the above description, the first stage collision member is used as a means for making the direction of the central axis of fiber bundle jetting from the first stage collision member one inch in the width direction of the nonwoven web.
Although the explanation has been given by taking as an example a case in which a method of swinging in the width direction is adopted, the present invention is not necessarily limited to this method. As for the type, the direction of the central axis of fiber bundle jetting can be controlled by a method of swinging the pipe 3 or a method of alternately applying jet air or suction air to the fiber bundle from the left and right sides near the first stage collision member. A method of swinging may also be adopted.

FIG. 2 is a schematic view of FIG. 1 seen from the side, and shows the difference α in the longitudinal direction of the nonwoven web between adjacent weights at the position where the ejected fiber bundle leaves the second collision member. According to the findings of the present inventors, this positional difference Q is usually 5 to 30 mm.
It is preferably within the range of .

If this positional difference is increased, the interference with adjacent spindles can be reduced, but the difference in ejection conditions will also be large, and the spread of the filament group will tend to occur outside the spindles, which is not preferable. On the other hand, if the positional difference is made small, interference with adjacent weights tends to occur, which is not preferable.

FIG. 3 shows another actual IM aspect of the present invention.
This is a view corresponding to the top view of the figure, and the detachment position from the second stage collision member is changed alternately between adjacent weights. By adopting such an aspect, the filament collecting positions 9 on the net conveyor 10 are arranged in a so-called staggered pattern in the width direction.

Figures 4 and 5 show that a second-stage collision member consisting of one member is used to make the collision angle the same for all spindles, and that the contact progress length of the ejected fiber bundle on the second-stage collision member is It shows an embodiment in which the weights are alternately different. That is, as shown in FIG. 5, the second stage collision member 1
The angle at which the ejected filament impinges on the spindle is the same for all spindles, and then the second-stage filament is bent in the middle.
The protruding member 11 is used to alternately change the length of contact progress between adjacent spindles from the middle of the member 11. In this method, since the collision angle to the second stage is the same for all spindles, it is possible to eliminate the difference between the spindles that causes collision force. In this case, it is important to adjust the collision angle and the distance from the first stage cutting protrusion member so that interference does not occur within the second stage collision surface. Although FIG. 4 shows a case in which one second-stage collision member 11 is used, an independent second-stage collision member may be used for each spindle.

Figure 6 shows an embodiment in which spindles are arranged in multiple rows in the line direction, with adjacent spindles in the same row taking off at alternate positions, and also alternating between rows. This is an example of an embodiment in which differences in the ejection states of the filament groups are canceled out over the entire web.

In the present invention, the means for differentiating the separation position of the fiber bundle for adjacent weights can be achieved by appropriately setting the shape of the second stage collision member, as explained in the drawings.
The specific shape thereof is not limited to the one shown in the drawings, and in addition to the bent type, a curved type can also be used.

In addition, by using two-stage collision members having the same shape and making the distances from the first-stage collision member different for adjacent weights, the distance from the second-stage collision member in the length direction of the nonwoven web can be changed. It is also possible to make the fiber bundle separation positions different.

[Example] Example 1 Gold diameter φ100mm, cap spacing 200mm, number of cap holes 5
Polyethylene terethalate was collected from an 8-spindle spinning block with 0 holes/cap at 1.5 CI/cap hole.
It was discharged within minutes. The discharged filament was sucked into each spindle by a conventional ejector placed δ2 at a distance of 800 mm directly below the spindle. As shown in FIG. 1, the ejectors are arranged in a horizontal line corresponding to the spinnerets. The suction filament is φlOx1000
The filament was moved forward with a pipe of 1.0 mm diameter and collided with the first stage collision member shown in 4 in FIG. The first stage j projection member 4 was oscillated by a stepping motor 6 at 3 cps, the oscillation angle was 20' on one side with respect to the line direction, and the oscillation direction was the same for all spindles.

On the other hand, a second-stage collision member is installed at a distance of 1 Qmm from the end of the first-stage collision member, and the second-stage collision member is staggered from the second-stage collision member with all weights integrated in the manner shown in FIG. The filament release position was changed, and the position difference Q was iQmm, and the filament was ejected in the vertical direction.

The second stage collision angle is 30° with respect to the pipe axis,
For one spindle, 5mm forward from the second stage collision point (
The spindles were set so that they were ejected vertically at a position (on the downstream side), and ejected vertically from a spindle adjacent to this at a position 25 mm forward, alternating with each other with a position difference of 1 Q mm.

Using this ejection method, the ejected filaments are collected on a net conveyor with a suction surface approximately 5 Qcm below the first-stage collision surface, and a nonwoven web is produced using the same method as for ordinary spunbond fabrics. It's 19.

The nonwoven web thus obtained had a rating of 60q/TI+2, and its uniformity and strength characteristic ratio of knotweed/width were evaluated, and the results were as shown in Table 1 below.

Table 1 Note that the CV value is determined by cutting a sheet of nonwoven web width x 100 cm into small pieces of 5 x 5 cm, measuring the weight and size, and determining the width and length directions by two-way variance analysis.
It is calculated separately into error terms.

To determine the vertical/horizontal strength ratio, sample a 5x2Qcm test piece from the sheet, first measure its l, determine the area weight (Q/m2) of the sample piece, and then measure the strength (kg15cm) using a tensile tester. and strength (kg15
cm/Q/m2), measured vertically and horizontally, and then determined the vertical/horizontal ratio.

Comparative example The first stage Hyakubun member is the same as the example, but the second stage collision member 11 is integrated with the spindle and is located 5 m from the second stage collision point.
The nonwoven web was ejected in the vertical direction at a position in front of m, and the nonwoven web was ejected in the same manner as in the example.

The properties of the obtained nonwoven web are as shown in Table 2 below, and compared to those obtained in the examples, it is inferior in terms of uniformity and large difference in vertical/horizontal properties. Oh.

Table 2 [Effects of the Invention] According to the present invention as described above, a nonwoven web with excellent uniformity and excellent vertical/horizontal property ratio can be produced with a simple configuration. is.

The effect of the present invention is that the fibers IY ejected from the fiber supply device linearly arranged in the direction perpendicular to the direction of the nonwoven web production line (in the width direction) are prevented from getting entangled with the fibers due to interference between adjacent spindles. In addition to obtaining a uniform nonwoven web without eliminating the fibers, the length/width characteristic ratio of the nonwoven web is reduced by spreading the airflow ejected from the fiber supply device in the width direction as much as possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. Figure 2 is a schematic diagram of Figure 1 viewed from the side;
This figure shows the arrangement of two collision members. 3 to 6 are for explaining other embodiments of the present invention, FIG. 3 is a view from above and schematically represents the web collection position, and FIG. 4 is a view from the top. FIG. 5 is a perspective view showing another aspect other than the one shown in the figure, and FIG. 5 is a schematic view of the device shown in FIG. 4, viewed from the side. FIG. 6 schematically shows an example of an embodiment in which spinning blocks are arranged in multiple rows, showing the deposition positions of filaments 1 to 3 from each spindle. 1: Filament group 2: Ejector 3: Pipe 4: First stage collision member 5: Flexible wire 6: Stepping motor 7: Second stage collision member 8: Ejection filament group 9: Filament group deposition position 10: Net conveyor 11: Second stage collision member: Position difference in the length direction of the nonwoven web between the adjacent weights at the ejected fiber bundle release position W1 Applicant Toshi Co., Ltd.

Claims (7)

[Claims] (1) Fiber bundles ejected from a fiber supply device using air flow arranged substantially in a line in the width direction of the nonwoven web are caused to collide with a first stage collision member to change the ejection direction, and further, When colliding the fiber bundle with a second-stage collision member to spread it, and collecting the fiber bundle ejected from the second-stage collision member onto a net conveyor to form a nonwoven web, the first-stage collision The central axis direction of the fiber bundle injection from the member is swung in the width direction of the nonwoven web, and the fiber bundle release position from the second stage collision member in the length direction of the nonwoven web is substantially adjusted for each adjacent fiber supply device. A method for producing a nonwoven web, which comprises forming a nonwoven web by overlapping different and adjacent ejected fiber groups in the width direction of the nonwoven web and collecting them on the net conveyor. (2) The nonwoven fabric according to claim (1), wherein the central axes of fiber bundle jetting from the second stage collision member corresponding to each fiber supply device are all substantially parallel. Web manufacturing method. (3) A patent characterized in that by swinging the first stage collision member in the width direction of the nonwoven web, the central axis direction of the fiber bundle jet from the first stage collision member is made to swing in the width direction of the nonwoven web. A method for producing a nonwoven web according to claim (1) or (2). (4) The fiber bundle separation positions in the length direction of the web from adjacent second-stage collision members are staggered. 3) The method for producing a nonwoven web as described in item 3). (5) A patent claim characterized in that the contact progress length of the ejected fiber bundle on the second-stage collision member is made different, and the position at which the fiber bundle leaves the second-stage collision member in the length direction of the web is made different. Range of items (1), (2), and (
The method for producing a nonwoven web according to item 3) or item (4). (6) Arranging fiber supply device rows in multiple rows on a nonwoven web production line in which the fiber bundle separation position from the second stage collision member in the web length direction is alternated for each adjacent supply device, and Claims (1), (2), (3), and (4) are characterized in that the fiber bundle separation positions are arranged at different positions in the line direction as well.
The method for producing a nonwoven web according to item (5) or item (5). (7) A plurality of fiber supply devices that use airflow to suck and eject fiber bundles, and a device that is provided corresponding to the plurality of fiber supply devices and that changes the ejection direction of the fiber group ejected from the fiber supply devices. a first-stage collision member, and a second stage for further jetting out the fiber group spouted from the first-stage collision member at different fiber bundle release positions in the length direction of the nonwoven web for each adjacent fiber supply device. A nonwoven web manufacturing apparatus comprising a stage collision member and a net conveyor that collects fiber bundles ejected from the second stage collision member.