JPH0118181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an entangled fiber sheet,
More specifically, the present invention relates to a method for producing an intertwined fiber sheet with improved surface smoothness, surface density, and entanglement properties.

Conventionally, the needle punch method has been widely used as an entangling treatment for fiber sheets, and has become a general-purpose technology in the field of nonwoven fabrics, especially artificial leather.

In recent years, the high-speed fluid punch method, which had been discovered for a long time as a unit technology, has been reviewed and put into practical use for entangling some fiber sheets.

In this conventional high-speed fluid punching method, a fiber sheet is placed on a conveyor net that moves at a constant speed, and a high-speed fluid flow impinges on the fiber sheet to cause entanglement. Punching with high-speed fluid makes it possible to highly entangle and densify thin fiber sheets, resulting in high-density products that cannot be obtained with conventional needle punching. Furthermore, in order to provide strength in the width direction of the sheet, for example, as shown in Japanese Patent Publication No. 47-30740, it is also known that the fluid jet nozzle is oscillated in the width direction of the sheet. .

However, in these conventional methods, the surface fibers move deep inside the fiber sheet to the back surface where the high-speed fluid collides with the sheet surface, causing entanglement, but the extent of entanglement on the fiber sheet surface is The surface was extremely poor in uniformity because it was limited to the area where the collision occurred, and that area remained as deep groove-like depressions and uneven lines.

In order to improve this drawback, the pressure applied to the fluid is changed for each treatment, and the collision energy of the high-speed fluid flow is changed and repeated. As shown in the figure, the injection nozzle is given rotational motion in a plane parallel to the sheet surface, causing it to draw a spiral curved trajectory on the sheet surface.

Although the following methods have been proposed, a fiber entangled sheet with good surface uniformity could not be obtained by these methods.

In other words, in the method (2), even if the treatment is repeated many times with different pressures, the parts that were hit by the last treatment will remain as grooves, so the surface irregularities will still be large. It was hot.

In addition, in the method (2), since the sheet surface is filled with the impact locus, the portion that is not hit is reduced, but a spiral curve remains on the sheet surface, and furthermore, at the intersection of the spiral curves, This results in a double impact situation, resulting in the creation of a new non-uniform surface with a higher entanglement density than other parts.

The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art, and to produce a dense fiber-entangled sheet with excellent surface smoothness, in which the fibers in the surface layer of the fiber sheet are extremely highly fibrillated and intertwined. We aim to provide the following.

The configuration of the present invention that achieves the above object is such that when a high-speed fluid stream discharged from a jet nozzle that is oscillated linearly in the width direction of the sheet collides with the surface of the traveling fiber sheet to entangle the fibers, the jet The amplitude of the nozzle is equal to or greater than the jet nozzle arrangement pitch, and the swing speed is set so that the impact area of the high-speed fluid flow is at least the sheet surface area excluding the ears.
This is a method for producing a fiber entangled sheet, characterized in that the impact density is 100% or more and 500% or less in a range of 90% or more.

The present invention will be explained in more detail based on the drawings.

FIG. 1 shows an example of a nozzle swing pattern (triangular waveform) in the fiber entangled sheet manufacturing method according to the present invention, and FIGS. 2 and 3 show examples of other nozzle swing patterns of the present invention. It shows.
Moreover, FIGS. 4 and 5 show an example of a nozzle swing pattern in multiple injection according to the present invention.

In FIGS. 1 to 5, the X axis (sheet width direction) represents the nozzle swing speed, and the Y axis represents the sheet advancing speed.

Figure 1 shows a nozzle device in which nozzles with a high-speed fluid jet aperture diameter d are arranged in a line in a straight line in the sheet width direction at an arrangement pitch P, and the nozzle device is oscillated in the X-axis direction with an oscillation amplitude twice the nozzle pitch P. , the nozzle swing turning angle α (see Figure 1) is set so that the impact traces a (shaded areas) caused by the high-speed fluid flow of each nozzle overlap and there is no gap, and the sheet surface is impacted. The impact trajectory is shown when it is filled in with trace a.

As shown in FIG. 1, an oscillation pattern in which the impact marks a caused by the high-speed fluid flow of each nozzle do not overlap or fill the sheet surface without gaps is referred to as 100% impact density.

The effective striking part is the central part L of the nozzle swing pattern shown in the figure, and both ends l (corresponding to the swing amplitude) are cut off as ears in a later process.

In addition, part b is an unstrucked part, and the area of the single unstrucked part is determined by the nozzle injection aperture diameter d, the nozzle arrangement pitch P, and the swing turnback angle α, and the number of occurrences is determined by the number of nozzle swingback turns and the number of nozzles. The product is the product. In other words, the ratio of the area of the striking part to the total surface area of the sheet is expressed as: Total surface area of the sheet - [Single area of unimpacted part x number of nozzle swing turns x number of nozzles]/total sheet surface area.

As described above, in order to reduce the area occupied by the unimpacted portion b on the sheet surface, it is possible to set a large nozzle swing amplitude and increase the impact area of the high-speed fluid flow per unit number of turns. Conversely, by setting the nozzle swing amplitude small, the area occupied by the unhitted portion b increases. Examples of swing patterns showing this are shown in FIGS. 2 and 3.

Figure 2 shows a nozzle swing amplitude of 1.5 compared to Figure 1.
This figure shows a striking pattern when the nozzle is made twice as large and oscillated at three times the nozzle arrangement pitch P, and the area of the unhitted portion b relative to the sheet surface area is 1/1.5 times that of FIG. 1.

Figure 3 shows the nozzle swing amplitude reduced to 1/2 compared to Figure 1.
This figure shows the impact pattern when the impact pattern is made twice as small and oscillated with an amplitude equal to the nozzle arrangement pitch P, and the area of the unimpacted portion b relative to the sheet surface area is twice that of FIG. 1.

Figures 4 and 5 illustrate the nozzle swing pattern in the case of multiple strikes with a striking density of 100% or more, and Figure 4 shows double strikes on the sheet surface in one nozzle swing process. FIG. 5 shows a swing pattern when the sheet surface is triple-impacted in one nozzle swing process.

In Fig. 4, nozzles N ₁ , N ₂ ...N _o with a high-speed fluid jet aperture diameter d are arranged in a row in the sheet width direction at equal pitches P, arranged in a row in the X-axis direction, and arranged in a row in the X-axis direction. is swung in the direction.

Here, 50% of the impact trace area of nozzle N ₁ is impacted by nozzle N ₂ adjacent to nozzle N ₁ ,
This part becomes the double impact part e (shaded part). Further, of the impact trace area of nozzle N ₂ , 50% of the remaining impact trace area that was not overlapped by nozzle N ₁ is struck by nozzle N ₃ adjacent to nozzle N ₂ , and this part is also the same as above. This becomes the double impact part e′. Thereafter, in the same way, adjacent nozzles N ₄ , N ₅ ... 50% sequentially by N _o
Continuous double striking parts e, e' . . . are constructed one by one.

As mentioned above, a swing pattern in which the sheet surface is continuously hit twice in one swinging process of the nozzle is referred to as a striking density of 200%.

Next, in FIG. 5, _the nozzle arrangement is the same as in _FIG .
The part will be in a double blow condition. Further nozzle N ₂
The remaining 1/3 part of the area of the impact trace of the nozzle N ₁ is impacted by the nozzle N ₃ adjacent to , and this impact area becomes a triple impact area f (shaded area). Thereafter, in the same way, the adjacent nozzles N ₄ , N ₅ ...N _o are sequentially 1/3
A triple striking part f'... of the part is successively formed.

As described above, the swing pattern in which the sheet surface is continuously hit three times in one swing process of the nozzle is referred to as a strike density of 300%.

Although not shown, it is possible to either make the nozzle swinging speed X faster than the example shown in FIG. Depending on the method, 1
By setting conditions that increase the overlapping portion of the impact trace area caused by adjacent nozzles in the swinging process, it is possible to perform high-density processing of 300% or more.

The nozzle arrangement is not limited to the one-row linear arrangement illustrated here, but may be a linear arrangement of two or more rows, or even a staggered arrangement.

According to the method of the present invention, for a fiber sheet moving at a constant speed, a) sheet movement speed, b) nozzle injection hole diameter (impingement area of high-speed fluid flow on the fiber sheet surface), c) nozzle arrangement interval (high-speed Set each condition of fluid flow jetting density to the desired conditions, set the amplitude of the jet nozzle to be equal to or higher than the jet nozzle arrangement pitch, and set the swing speed by the relative speed with respect to the sheet advancing speed. In a range where the collision area of the high-speed fluid flow is at least 90% or more of the sheet surface area excluding the edges, the sheet surface is uniformly filled by making the impact density of the impact traces to be 100% or more and 500% or less. It is something.

This makes it possible to obtain a fiber entangled sheet that is smooth with few uneven surfaces, has no unevenness in density, and is dense and highly entangled.

In the present invention, if the swing amplitude is less than the nozzle arrangement pitch, a striking trajectory due to continuous high-speed fluid flow in the swing direction of adjacent nozzles cannot be obtained;
The impact trajectory is only for each nozzle itself, and an unhit area corresponding to the difference between the pitch and the swing amplitude occurs along the sheet traveling direction between the nozzle arrangement pitches, resulting in a fiber sheet surface with extremely poor surface smoothness. Become.

Here, the range in which the impact area of the high-speed fluid flow is at least 90% or more of the sheet surface area excluding the selvedges refers to the range where the impact area of the high-speed fluid flow is at least 90% or more of the surface area of the sheet excluding the selvedges. This is the ratio of the area of the striking part a to the area of the part b, and in the present invention, it is important that the area of the striking part a be 90% or more. That is, when the area of the struck portion a is 90% or less, there are many unhitted portions, and these portions appear as streaks on the surface of the fiber sheet.

On the other hand, in the present invention, in one treatment, the impact density is set to 100% or more and 500% or less, but when the impact density is less than 100%, the impact area becomes extremely concave streaks compared to the unhit area. remain. In addition, in high-density processing where the impact density is 500% or more, the entanglement of each fiber is almost completed, making it difficult to move between the fibers on the surface of the fiber sheet, and therefore high-speed fluid flow is generated in this area. When the fibers collide, some of the single fibers are cut by the energy generated by the collision of the high-speed fluid flow, resulting in a fiber entangled sheet with poor strength.

In the present invention, the impact density is 150% or more and 300%
By setting the following conditions, a fiber sheet with even higher entangling efficiency and good surface uniformity can be obtained.

The oscillating waveform of the injection nozzle is preferably a straight triangular folded waveform, but a sine waveform may be used to alleviate the inertial force of the folded part.

The present invention is characterized in that the impact density is set to 100% to 500% in one treatment, but in this case, for example, the impact density is set to 500% in one treatment. The treatment may be repeated multiple times, and if it is desired to obtain a fiber sheet with a high basis weight, it is preferable to perform the treatment multiple times alternately on the front and back sides.

When carrying out the method of the present invention, it is necessary to accurately position and swing the nozzle unit, which has a high pressure-resistant structure and is necessarily a heavy structure. A fiber entangled sheet manufacturing apparatus suitable for the following will be described in detail with reference to the drawings.

FIG. 6 is a schematic plan view showing an example of a fiber entangled sheet manufacturing apparatus, and FIG. 7 is a right side view of FIG.
Further, FIG. 8 is a cross-sectional view taken along the line AA in FIG. 6, and shows an example of a nozzle device for producing a fiber entangled sheet.

The apparatus shown in FIG. 6 includes a nozzle device 1 for manufacturing a fiber entangled sheet, a conveyor device 2, a fiber sheet 3,
A nozzle head 8 (see FIG. 7) equipped with a downwardly-opening high-speed fluid jet nozzle is located in the center of the nozzle device 1 for producing a fiber entangled sheet. are arranged in the width direction of the sheet, facing the surface of the conveyor net 4. The fiber sheets 3 loaded on the conveyor net 4 are conveyed at a constant speed in the direction of the arrow.

Furthermore, as shown in FIG. 7, the conveyor net 4 has a convex shape with the apex being the collision part of the high-speed fluid jet jetted from the high-speed fluid jet nozzle mounted on the nozzle head 8, and the convex apex position of the conveyor 4 is The opening 28 is provided to allow the high-speed fluid flow that has passed through the fiber sheet 3 and the conveyor net 4 to pass through and be discharged without being accumulated within the fiber sheet or between the fiber sheet and the conveyor net. A fluid discharge pipe 27 is arranged for this purpose, which fluid discharge pipe 27 simultaneously supports the conveyor 4 .

Here, it is preferable that the conveyor net 4 has an upwardly convex hanging configuration when water is used as the high-speed fluid flow. Although this is designed to facilitate the flow of residual water such as reflected water that has not been drained away along the convex surface of the conveyor net 4, a horizontally stretched configuration or the like may also be used.

The conveyor net 4 configured as described above includes a conveyor drive motor 5, a drive roller 6, and a driven roller 7.
It is moved at a constant speed.

In the nozzle device 1 for manufacturing fiber entangled sheets shown in FIG. 8, the nozzle head 8 includes a high-pressure fluid inlet hole 29, an upper flow path 30, a lower flow path 32, an upper and lower flow path communication hole 31, a rectifying plate 9, and a high-speed fluid flow. A high-speed fluid jet nozzle 10 with a plurality of injection holes drilled in the width direction of the sheet, a pressure plate 11 that supports the nozzle against high-pressure fluid, and a pressure plate mounting bolt 21
The high-pressure fluid pressurized by a pressure pump (not shown) flows into the nozzle head 8 from the high-pressure fluid inlet hole 29, fills the upper flow path 30, and flows in the axial direction between the upper and lower flow paths. The water flows into the lower flow path 32 through a plurality of upstream and downstream flow communication holes 31 drilled in the upper and lower flow paths 32 while being distributed in the axial direction. After the high-pressure fluid is rectified by the rectifying plate 9 disposed in the center of the lower flow path 32, it passes through the injection hole of the high-speed fluid injection nozzle 10 located at the end of the flow path that is connected to the lower flow path in a continuous slit shape. By passing through, it becomes a high-speed fluid stream and is discharged.

The nozzle head 8 having the high-speed fluid flow generating mechanism has a support shaft 15 at both ends of the nozzle head.
The support shafts 15 and 16 are further supported by a bearing 13 containing a bearing 19 that can roll and guide reciprocating motion, rotational motion, and compound motion. The bearing 13 bears the reciprocating oscillating movement of the nozzle head 8 and the rotational movement when the nozzle head 8 is reversed in order to obtain an optimum working position when replacing the high-speed fluid jet nozzle 10. Further, at the tip of the support shaft 15, there is an electro-hydraulic stepping cylinder 1 which is an actuator capable of linearly reciprocating the nozzle head 8 in the sheet width direction via a rotatable joint 14 that can be loaded with a tensile or compressive load.
2 is installed.

On the other hand, a spline groove is machined at the tip of the support shaft 16, and a spline shaft joint 17 is linearly guided and connected to the spline groove. The spline shaft joint 1
7 is fixed to the housing 20 with a key 22, and the tip of the housing 20 is connected to the output shaft of the worm reducer 18 used as a booster with a locking key and a set screw (both not shown). ) is fixed.

The above spline shaft joint 17 and worm reducer 1
8, the rotational force around the axis generated by vibrations during the reciprocating rocking movement of the nozzle head 8 can be applied to the boosting mechanism of the worm reducer 18 via the spline shaft joint 17. Further, by the guided connection of the spline shaft joint 17, linear reciprocating rocking motion can be performed freely.

Furthermore, when replacing the high-speed fluid jet nozzle 10, the work of reversing the nozzle head 8 is performed using the worm reducer 1.
By rotating the input shaft of 8, torque is transmitted via a spline shaft joint 17 fixed to the output shaft, and it can be reversed to any angular position. The inverted position can be maintained.

The feature of the nozzle device applied to the method of the present invention, in which the above-mentioned mechanism is arranged in the sheet width direction, is that because of its high pressure-resistant structure, the swinging actuator of the nozzle head 8, which is inevitably heavy (over 100 kg), is The reason is that an electro-hydraulic stepping cylinder 12 having high output and high-speed response is used.

Figure 9 shows the electro-hydraulic stepping cylinder 12.
FIG.

In FIG. 9, the step-like rotational displacement of an electric stepping motor 23 whose rotation is controlled by pulses transmitted by a pulse generator (not shown) is converted into a linear displacement by a screw shaft 24. A hydraulic force is amplified through a valve spool (three-way valve) 25 screwed to the cylinder 24, and the cylinder rod 26 is linearly displaced in response to the rotational displacement of the electric stepping motor 23. The working oil pressure is provided by a hydraulic pump (not shown).
It is guided into the cylinder 26 via Ps and returns to the tank via Pt.

As described above, the electro-hydraulic stepping cylinder in which a hydraulic servo valve is directly driven by a pulse motor has high output, high-speed response, and can precisely control the stop position.

For example, if the inner diameter of the cylinder is 30mmφ, thrust: speed 100mm/sec, working oil pressure 70Kg/cm ²
When, push and pull side both 140Kg speed 60mm/sec, working oil pressure
70Kg/cm ² o'clock, 210Kg on both push and pull sides Resolution: 0.1mm/step Maximum speed: 100mm/sec (1000pps).

In addition to the electro-hydraulic stepping cylinder, systems such as a hydraulic servo mechanism, a combination of a DC servo motor and a precision feed screw mechanism are also effective as the nozzle swing actuator.

As mentioned above, an electro-hydraulic stepping cylinder with a built-in digital control valve that has high output and high-speed response serves as an actuator for accurately positioning and swinging the nozzle unit, which has a high pressure-resistant structure and is inevitably a heavy structure. By using this, it becomes possible to carry out the method for manufacturing an entangled fiber sheet according to the present invention.

In the high-speed fluid flow treatment of the present invention, the fluid used in the high-speed fluid flow may be liquid or gas, but water is most preferably used in terms of ease of handling, cost, and amount of collision energy as a fluid. Furthermore, organic solvents, alkali, acid aqueous solutions, etc. may also be used depending on the purpose.

This fluid is pressurized by a high-pressure pump and is jetted from a discharge hole with a small diameter, and is sprayed onto the fiber sheet surface as a high-speed columnar flow.

As for the pressure conditions, a range of about 5 to 300 kg/cm ² can be used. At pressures lower than 5Kg/ ^cm2 , the entanglement effect is small;
At pressures higher than 300Kg/ ^cm2 , impact defects and deformation occur.
A preferred range is 20 to 200 Kg/cm ² , more preferably 30 to 150 Kg/cm ² .

Next, as the fiber sheet that can be used in the present invention, ordinary nonwoven fabrics, laminates of woven or knitted fabrics and nonwoven fabrics, laminates of nonwoven fabrics with different properties, etc. It can be manufactured by forming a sheet by a sheet forming method such as a web forming method or a paper making method, and further fixing the structure by a method such as needle punching or primary fluid punching, if necessary.

The fibers constituting the fiber sheet used in the present invention are:
Natural fibers, chemical fibers, synthetic fibers, or combinations thereof can be used.

By having the configuration described in detail above, the present invention achieves the following excellent effects.

In other words, the collision area of the high-speed fluid flow created by setting the amplitude of the injection nozzle to be equal to or greater than the injection nozzle arrangement pitch and the swing speed relative to the sheet advancing speed excluding the edge of the sheet is The impact density is 100% or more and 500% or less over at least 90% of the surface area, resulting in uniform impact density, high entanglement, excellent surface smoothness, and high surface density. , a high-quality fiber entangled sheet can be obtained.

The fiber entangled sheet obtained by the treatment method of the present invention has a high density and uniform surface even as it is,
In addition, it can be used as a highly flexible sheet for industrial and material purposes, and can also be dyed and used for clothing.

Further, the method of the present invention can easily obtain a sheet made of ultrafine fiber bundles, and can also easily form a fibrillated entangled layer from the ultrafine fiber bundles, so that it can be applied to the above-mentioned uses. In addition, in the field of silver-finished artificial leather, which has conventionally been made by laminating polyurethane films to create a silver surface, it is possible to obtain a new fiber sheet with a surface made of fibrillated and entangled microfiber bundles similar to natural leather. be. Therefore, the treated sheet obtained by the present invention can be widely used as a base material for artificial leather, and can be applied to natural leather applications such as silver-finished artificial leather, nubuck-like artificial leather, and suede-like artificial leather. Become.

The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples. All parts and percentages used in the examples are by weight.

Example 1 Polyethylene 50 containing 50 parts of polyethylene terephthalate as the island component of the ultrafine fiber bundle and 5% of polyethylene glycol (molecular weight 20,000) as the sea component
A polymer array fiber type multicomponent fiber with 16 islands is spun into a 3.8 denier, 51 mm fiber.
It is made into long staples and processed through the steps of opening, carding, cross-slap, and needle punching to obtain a fabric weight of 190.
It was made into a fiber sheet of g/m ² and thickness of 1.0 mm.

Next, the fiber sheet was made with holes of 0.6 mm in diameter and 0.13 mm in diameter.
Pressure 80Kg/ from injection nozzles lined up in a row
cm ² , and the jet nozzle is oscillated in a straight line with a stroke of 6 mm on one side and a number of reciprocations of 5 times/second, and the trajectory of the collision area of the columnar water stream is 300%.
The process of spraying a high-speed water stream onto one side was repeated four times while continuously conveying the material at a speed of 0.25 m/min using a conveyor net with an 80-mesh opening so as to overlap the material.
Dry. The unhitted portion of the sheet central portion L excluding the ears is O.

Separately, as a comparative example, a fiber sheet made in the same manner was sprayed with a columnar water stream at a pressure of 80 kg/cm ² from a fixed spray nozzle (the nozzle was not oscillated) in which holes of 0.13 mm in diameter were lined up in a row at a pitch of 0.6 mm. The process was repeated four times and dried.

A comparison of the fiber entangled sheets after both treatments revealed that the surface of the inventive example was very smooth and formed a surface in which the ultrafine fibers were evenly intertwined, whereas the comparative example had a columnar water sprayed area. There were concave streaks and the surface smoothness was poor.

After both treatments, the fiber-entangled sheet is impregnated with polyurethane emulsion, the polystyrene is removed with perchlorethylene, and it is embossed with an embossing roll carved with leather-like grains, then dyed and colored, and silver When used as attendant leather, the leather according to the present invention exhibited a feel, surface shape, and softness similar to natural leather, whereas the leather according to the comparative example had a marked unevenness in the texture and texture of the surface. It was also rough and not good.

Furthermore, when the bending properties of both leathers were measured according to JIS K6545-1970, the present invention showed no abnormalities on the surface even after being bent 100,000 times, while the comparative example had cracks on the surface after being bent 30,000 times. had formed, indicating a cracked state.

Example 2 Nylon 6 and styrene copolymer (higher alcohol copolymer of styrene and acrylic acid) were mixed at a nylon 6/styrene copolymer ratio of 50/50 to produce a mixed-spun type multicomponent yarn. The fibers were spun into staples of 4 denier and 51 mm in length, and passed through the steps of opening, carding, cross slapping, and needle punching to produce a fiber sheet with a thickness of 3.0 mm and a basis weight of 540 g/m ² .

While removing polyvinyl alcohol by showering the obtained fiber sheet, under the same 300% impact density conditions and nozzle conditions as in Example 1,
Drying was repeated by spraying high-speed columnar water jets three times from both sides at a pressure of 60 kg/cm ² .

On the other hand, for comparison, drying was performed by simply spraying a high-speed columnar water stream three times from both sides using a nozzle fixed at 60 kg/cm ² .

When the fiber entangled sheets after both treatments were compared, the surface of the inventive example was extremely densely entangled and had sufficient smoothness, whereas the comparative example had noticeable streaks due to spraying and the surface was rough. The interlaced state also showed unevenness in density between the peaks and valleys of the streaks.

Furthermore, both fiber entangled sheets were impregnated with a 5% solution of polyurethane, and after wet coagulation, the solvent was removed, and after drying, a finishing polyurethane resin liquid was gravure coated, and textured using an embossing roll engraved with a comparison pattern. After that, it was dyed and colored to make silver-covered artificial leather.

The inventive example had a feel, surface condition, and soft feel just like natural leather, whereas the comparative example had noticeable unevenness of the surface streaks and did not have a good feel.

Furthermore, when both leathers were subjected to a repeated shear fatigue test using a Scott type cyclic shear fatigue tester at an elongation rate of 25%, the present invention showed no abnormality even after 50,000 repetitions, but the comparative example showed no abnormality after 20,000 repetitions. It showed a cracked state at the time.

[Brief explanation of drawings]

FIG. 1 shows an example of a nozzle swing pattern (triangular waveform) in the fiber entangled sheet manufacturing method according to the present invention, and FIGS. 2 and 3 show examples of other nozzle swing patterns of the present invention. shows. Figure 4 shows
Fig. 5 shows the nozzle swing pattern when the impact density of the present invention is 200%.
It shows the nozzle swing pattern at %. FIG. 6 is a schematic plan view showing an example of a fiber entangled sheet manufacturing apparatus, and FIG. 7 is a right side view of FIG. 6. FIG. 8 is a sectional view taken along the line AA in FIG. 6, and shows an example of a nozzle swinging device. FIG. 9 is a sectional view showing the structure of the electrohydraulic stepping cylinder. Explanation of symbols in the drawings a: impact trace, b: unhit area, P: nozzle arrangement pitch, d: nozzle high-speed fluid jet injection aperture, α: swing folding angle, l: lug,
L: effective striking part, N ₁ to _No : nozzle number, 1: nozzle device for manufacturing fiber entangled sheets, 2: conveyor device, 3: fiber sheet, 4: net conveyor, 5:
Net conveyor drive motor, 6: drive roller,
7: Followed roller, 8: Nozzle head, 9: Straightening plate, 10: High speed fluid jet nozzle, 11: Pressure plate, 12: Electro-hydraulic stepping cylinder, 1
3: Bearing, 14: Joint, 15, 16: Support shaft, 17: Spline shaft joint, 18: Worm reducer, 19: Bearing, 20: Housing, 2
1: Pressure plate mounting bolt, 22: Key, 23: Electric stepping motor, 24: Screw shaft, 25: Valve spool 26: Cylinder load, 27: Fluid discharge pipe, 28: Opening, 29: High pressure fluid inlet hole, 30: Upper flow path, 31: Upper and lower flow path communication hole,
32: Lower flow path.

Claims (1)

[Claims] 1. When colliding a high-speed fluid stream discharged from a jet nozzle that is oscillated linearly in the width direction of the sheet against the running fiber sheet surface to entangle the fibers, the amplitude of the jet nozzle is set to be equal to or equal to the jet nozzle arrangement pitch. 100% or more in the range where the collision area of the high-speed fluid flow is at least 90% of the sheet surface area excluding the ears.
A method for producing an entangled fiber sheet, characterized in that the impact density is 500% or less.