JPH0670297B2 - Fiber entangled sheet manufacturing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for producing a fiber entangled sheet having improved surface smoothness, surface denseness and entanglement.

{Prior Art} Conventionally, the needle punching method has been widely used as an entanglement treatment for fiber sheets, and has been generalized in the field of nonwoven fabrics, especially artificial leather.

In recent years, the high-speed fluid punching method, which has long been discovered as a unit technology, has been reviewed, and it has been put to practical use for the entanglement of 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 is caused to collide with the fiber sheet for entanglement processing. Punching with a high-speed fluid makes it possible to highly entangle and densify a thin fiber sheet, and to obtain a high-density product that cannot be obtained by conventional needle punching. Further, for example, as shown in Japanese Patent Publication No. 47-30740, there is also known a fluid ejecting nozzle that is swung in the width direction of the sheet in order to impart strength in the width direction of the sheet.

However, in these conventional methods, in the portion where the high-speed fluid flow collides with the back surface of the sheet, the surface fibers move deep inside the fiber sheet to the back surface, and entanglement is performed. The surface was extremely inferior in uniformity because it was confined to the part that collided and that part remained deeply in the form of grooves as concave and convex streaks.

In order to remedy this drawback, the pressure applied to the fluid is changed for each treatment, the collision energy of the high-speed fluid flow is varied, and this is repeated, as disclosed in JP-A-54-27064 and JP-A-55-62256. As described above, a method has been proposed in which a rotating motion is applied to the injection nozzle on a plane parallel to the sheet surface so that a trajectory of a spiral curve is drawn on the sheet surface. However, a fiber entangled sheet having good surface uniformity was not obtained.

{Problems to be solved by the invention} That is, in the method of (1), even if the pressure is changed and the treatment is repeated many times, the portion hit by the last treatment remains as a groove, so that the surface unevenness is It was still big.

Further, in the method (1), since the sheet surface is painted by the striking locus, the portion not hit is reduced. However, as shown in FIG. 6, this striking pattern has a spiral curve locus on the sheet surface. Remains, and at the intersection of the spiral curved lines, a double-hit condition is reached,
It was found that a new streak-like impact mark with a higher confounding density than other parts remains, which is a drawback.

The object of the present invention is to eliminate the above-mentioned defects of the prior art,
An object of the present invention is to provide a device for producing a fiber entangled sheet, which has excellent surface smoothness, less unevenness in strength in the longitudinal and lateral directions of the fiber sheet, and less unevenness in appearance.

{Means and Actions for Solving Problems} The present invention has the following configurations in order to achieve the above object. That is, in a device for producing a fiber entangled sheet by colliding a high-pressure fluid from a high-pressure fluid injection nozzle with a fiber sheet, a nozzle head equipped with a high-pressure fluid injection nozzle is swung in the width direction (or length direction) of the fiber sheet. A nozzle head swinging device, a mount for supporting the nozzle head and the nozzle head swinging device, and a mount swinging device for swinging the mount in the length direction (or width direction) of the sheet. It is a manufacturing apparatus of the fiber entangled sheet.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is an external view showing an example of an apparatus for producing a fiber entangled sheet according to the present invention.

In FIG. 1, 1 is a net conveyor configured to move endlessly, and 2 is a fiber sheet placed on the net conveyor and transferred. Reference numeral 3 denotes a nozzle head having a high-pressure fluid flow injection nozzle mounted on its lower surface, and the nozzle head 3 is supported at both ends by rocking shafts 5 and 6 supported by rocking bearings 7 and 8. A swing actuator 4 capable of linearly reciprocating swinging the nozzle head 3 in the seat width direction is attached to the tip of one swing shaft 5 via a rotatable joint 9 capable of applying a tensile load and a compressive load. Further, a ball spline shaft joint 10 and a worm speed reducer 11 used as a booster are attached to the tip of the other swing shaft 6, and these nozzle head and nozzle head swing device are mounted by pedestals 12 and 13, respectively. It is supported.

FIG. 2 shows an example of the nozzle head and the nozzle head rocking device in FIG. 1, and is a front sectional view taken along the rocking direction axis. FIG. 3 is a plan view of FIG.

A nozzle head 3 comprising a high-pressure fluid inlet 20, an upper flow passage 21, a lower flow passage 22, an upper and lower flow passage connecting hole 23, a straightening plate 24, and a high-speed fluid injection nozzle 25 having a plurality of high-speed fluid injection holes. In, the high-pressure fluid pressurized by a pressure pump (not shown) flows into the nozzle head 3 through the high-pressure fluid inlet port 20, fills the upper-stage flow passage 21, and the axial center between the upper and lower-stage flow passages. Lower flow path through upper and lower flow path communication holes 23
The flow is distributed to 22 while being distributed in the axial direction.

The high-pressure fluid is a rectifying plate arranged in the central portion of the lower channel 22.
After being rectified by 24, a high-speed fluid flow is formed by passing through the injection port of the high-pressure fluid injection nozzle 25 arranged at the end of the flow path connected to the lower flow path in the form of continuous slits, and is injected into the fiber sheet. Although not shown, the fibrous sheet is run to a position facing the lower surface of the nozzle head 3 in either the direction facing the drawing or the opposite direction.

At both ends of the nozzle head 3 having the high-speed fluid flow generating mechanism, swing shafts 5 and 6 are arranged substantially on the same axis with respect to the swing direction of the nozzle head 3. The swing shafts 5 and 6 are supported by bearings capable of rolling and guiding reciprocating motion, rotary motion and compound motion, that is, bearings 7 and 8 having LM strokes 26 and 27 built therein.
The reciprocating rocking motion of the nozzle head 3 and the rotational motion of nozzle head reversal at the time of nozzle replacement are applied.

The ball spline shaft joint 10 at the tip of the swing shaft 6 is fixed to the housing 29 by the key 28 so as not to rotate.
The tip of the housing 29 is fixed to the output shaft of the worm speed reducer 11 used as a booster with a rotation prevention key and a retaining screw (both not shown).

By rotating the input shaft of the worm speed reducer 11, torque is transmitted to the nozzle head 3 via the ball spline shaft joint 10 fixed to the output shaft, and the nozzle head 3 is inverted to an arbitrary angular position. It is possible.

In the figure, 30 is a pressure plate for supporting the fluid ejection nozzle 25, and 31 is a bolt for mounting the pressure plate. Further, 12 and 13 are mounts for supporting the nozzle head 3 and the rocking device described above, and are attached to the right and left sides of the nozzle head except the lower surface of the nozzle head.

FIG. 4 is a front sectional view showing an embodiment of a swing actuator applicable to the present invention.

In the embodiment of FIG. 4, the swing actuator employs an electrohydraulic stepping cylinder.

In FIG. 4, reference numeral 32 denotes an electric stepping motor whose rotation is controlled by a pulse transmitted by a pulse generator (not shown), and which is provided between the motor 32 and a shaft 37 for swinging the fluid injection nozzle. A hydraulic chamber surrounded by the cylinder 35 is formed. A stepped rotation deviation of the stepping motor 32 is converted into a linear deviation by a screw shaft 33 attached to the tip of the motor 32 shaft and a valve spool (three-way valve) 34 screwed to the screw shaft 33. The conversion mechanism is configured and the conversion mechanism is fitted into the hydraulic chamber. further,
By applying hydraulic pressure to the valve spool 34 in the hydraulic chamber, the shaft 37 is force-amplified via the piston head 36 fixed to the tip of the shaft 37 connected to the valve spool 34 to rotate the electric stepping motor 32. A driving force different from the driving force due to the deviation is applied to the shaft 37. The working hydraulic pressure is supplied from a hydraulic pump (not shown) through Ps to the cylinder 35.
It is guided to the hydraulic chamber of and returned to the tank from Pt.

As mentioned above, the electro-hydraulic stepping cylinder that directly drives the hydraulic servo valve with the pulse motor has a high output,
It is preferably used because it has high-speed responsiveness and can perform precise stop position control, but the swing actuator is not limited to this method, but is a cam type, a crank type, a motor forward / reverse rotation type, or the like. The well-known reciprocating rocking mechanism is used.

As described above, with reference to FIG. 2 to FIG. 4, one example of the nozzle head applicable to the manufacturing apparatus for the fiber entangled sheet according to the present invention and the nozzle head rocking device for rocking the nozzle head in the width direction of the fiber sheet Although an example has been described, the present invention is
As shown in FIG. 1, the gantry 12, 13 supporting the nozzle head and the nozzle head oscillating device is characterized in that it is oscillated in the sheet traveling direction by another oscillating device. That is, this is characterized in that it gives the nozzle head a rectangular oscillating motion having corners protruding in the traveling direction of the fiber sheet.

Returning to FIG. 1 again, below the supporting bases 12 and 13 of the above-mentioned nozzle head rocking device, rocking devices 40 and 40 'for respectively rocking the frame 12 and 13 in the running direction of the fiber sheet. Is provided. In the case of this embodiment, both swinging devices have the same mechanism. This rocking device has almost the same mechanism as the above-mentioned rocking device of the nozzle head except that the nozzle head 3 is removed. That is, the pedestals 41, 41 ′ that support the entire apparatus are mounted with the pedestals 12, 13 of the nozzle head rocking device through the bearings 42, 43, 42 ′, 43 ′ provided by sandwiching the pedestals 12, 13. Support shafts 44,44 'for supporting and swing actuators 45,45' for swinging the support shafts 44,44 'in the running direction of the fiber sheet are provided at the tips of the support shafts 44,44'. . Although not shown, the gantry 1
2, 13 are attached and fixed to the support shafts 44, 44 'via flanges (not shown).

Reference numeral 46 is a drum for receiving the high-pressure fluid passing through the sheet.

The device of the present invention operates by alternately or simultaneously operating the nozzle head swing actuator 4 that swings in the width direction of the fiber sheet and the swing actuators 45 and 45 'that swing in the running direction of the fiber sheet. The head is provided with a rectangular rocking pattern having corners protruding in the running direction of the fiber sheet. That is, for example, first, the swing actuators 45 and 45 'are moved in the running direction of the fiber sheet, and then the swing actuator 4 is moved in the width direction of the fiber sheet, and further, the swing actuators.
45, 45 'moves the fiber sheet in the direction opposite to the traveling direction to return it to its original position, and then the rocking actuator 4 moves it in the width direction of the fiber sheet in the opposite direction to the original position. It is obtained by repeating the motion pattern. Alternatively, the swing actuator 4 and 45,45 '
It is also possible to move and in synchronization at the same time. That is, it is moved in the width direction of the fiber sheet at the same time as the running direction of the fiber sheet. As a result, the swing pattern becomes a rhombus.

In the above-described embodiment, the gantry supporting the oscillating device that oscillates the nozzle head equipped with the high-pressure fluid ejecting nozzle in the width direction of the seat is oscillated by the gantry oscillating device that oscillates in the length direction of the seat. Although the device is shown, the device of the present invention is not limited to the above-mentioned embodiment, and a pedestal that supports a rocking device that rocks a nozzle head equipped with a high-pressure fluid jet nozzle in the length direction of the seat is used. It may be a device in which it is made to swing by a gantry swinging device that swings in the width direction.

That is, in FIG. 1, the high-pressure fluid injection nozzle 3 is directly connected to the seat length direction swinging device 40, 40 ', and the swinging device 40, 40' is supported by the mounts 12, 13, and the mounter is further supported. The seats 12 and 13 may be swung in the seat width direction by, for example, a seat width direction rocking device shown by reference numerals 4 to 11 in FIG.

FIG. 5 shows an example of the entanglement pattern of hit traces by the jet nozzle on the surface of the fiber sheet obtained by the method of the present invention.

FIG. 5 shows an entangling pattern at an injection nozzle pitch of 2.5 mm, a swing amplitude of 9 mm, a swing frequency of 3.3 Hz, and a sheet speed of 0.25 m / min. As is clear from FIG. 5, the entanglement pattern according to the present invention is a pattern in which rectangular waves having corners protruding in the running direction of the fiber sheet are continuously repeated.

In the present invention, the rectangular wave is a rhombic linear continuous or closed circuit pattern when viewed in the running direction of the fiber sheet, and these patterns are drawn as a locus continuous in the running direction of the fiber sheet. The shape of the diamond pattern can be arbitrarily set depending on the rocking speed of the rocking actuators 4, 45, 45 'and the traveling speed of the fiber sheet.

In the treatment by the high-speed fluid flow of the present invention, the fluid used for the high-speed fluid flow is liquid or gas,
The amount of water is also preferably used from the viewpoints of ease of handling, cost, and amount of collision energy as a fluid. Furthermore, an organic solvent, an alkali, an aqueous solution of an acid or the like may be used depending on the purpose.

Such a fluid is pressurized by a high-pressure pump, ejected from a discharge hole having a small hole diameter, and jetted to the fiber sheet surface as a high-speed columnar flow.

The pressure condition can be used in the range of about 5 to 300 kg / cm ² .

{Advantages of the Invention} Since the present invention has the above-mentioned configuration, it exhibits the following excellent operational effects.

That is, since the swing pattern of the nozzle head is a rectangular wave having corners protruding in the running direction of the fiber sheet, the surface smoothness is excellent, and the strength unevenness in the longitudinal and lateral directions of the fiber sheet is small, and the appearance unevenness is small. It was possible to obtain a fiber-free entangled sheet.

[Brief description of drawings]

FIG. 1 is an external view showing an example of an apparatus for producing a fiber entangled sheet according to the present invention. FIG. 2 shows an example of the nozzle head and the nozzle head rocking device in FIG. 1, and is a front sectional view taken along the rocking direction axis. FIG. 3 is a plan view of FIG. FIG. 4 is a front sectional view showing an embodiment of a swing actuator applicable to the device of the present invention. FIG. 5 is a diagram showing an example of the entanglement pattern of hit traces by the injection nozzle on the surface of the fiber sheet obtained by the device of the present invention. FIG. 6 is a diagram showing an example of a entanglement pattern of hit marks by a jet nozzle on the surface of a fiber sheet obtained by a conventional method. Explanation of symbols in the drawings 1: Net conveyor, 2: Fiber sheet 3: Nozzle head 4: Oscillating actuator 5,6: Oscillating shaft, 7,8: Oscillating bearing 9: Joint, 10: Spline shaft joint 11: Worm reducer, 12, 13: Stand 20: High pressure fluid inlet, 21: Upper flow passage 22: Lower flow passage, 23: Upper flow passage communication hole 24: Rectifier plate, 25: Fluid injection nozzle 26, 27: Bearing 28: Key, 29: Housing 30: Pressure plate, 31: Bolt 32: Electric stepping motor 33: Screw shaft, 34: Valve spool 35: Cylinder, 36: Piston head 40, 40 ′: Stand swing device 41, 41 ′ : Pedestal 42,43,42 ', 43': Bearing 44,44 ': Support shaft 45,45': Swing actuator 46: Fluid receiving drum

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference Japanese Patent Publication 3-80906 (JP, B2) Japanese Patent Publication 4-1102 (JP, B2) Japanese Publication 61-60186 (JP, B2) Japanese Publication 62- 12342 (JP, B2) Actual public Sho 62-14136 (JP, Y2)

Claims (1)

[Claims] 1. An apparatus for producing a fiber entangled sheet by causing a high pressure fluid to collide with a fiber sheet from a high pressure fluid injection nozzle, wherein a nozzle head equipped with the high pressure fluid injection nozzle is arranged in a width direction (or a length direction) of the fiber sheet. A nozzle head oscillating device for oscillating, a pedestal supporting the nozzle head and the nozzle head oscillating device, and a gantry oscillating device for oscillating the gantry in the length direction (or width direction) of the sheet. An apparatus for manufacturing a fiber entangled sheet, characterized in that