JPH09256254A - Production of nonwoven fabric by interlacing with water stream, apparatus for producing nonwoven fabric an nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the treatment with a water stream improved in the interlacement in the transverse direction of a nonwoven fabric by arranging orifice nozzles at an angle in the oblique direction from the width direction of the nonwoven fabric and oppositely installing suction holes facing to the orifice nozzles. SOLUTION: An endless belt 1d comprising a net made of a synthetic resin is wound around plural rolls 1b and 1c including a driving roll 1a and nozzle units 2 are arranged at an angle α to an arrow Y in the upper part of the endless belt 1d when producing a nonwoven fabric by treatment with a water stream. Suction boxes 3 are arranged along the undersurface of the endless belt 1d in a state thereof facing to the nozzle units 2 or the nozzle unit 2 are arranged in a spiral form along the upper part of the outer peripheries of suction cylinders. High-pressure water is jetted from the nozzle units 2 while placing a nonwoven fabric N on the endless belt 1d or suction cylinders and transferring the nonwoven fabric N. Thereby, the interlacing treatment of the nonwoven fabric N with the water stream is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for intertwining a non-woven fabric by using a high pressure fountain from a large number of small orifice nozzles arranged and discharging the fountain by a suction box.

[0002]

2. Description of the Related Art A technique of entangled a nonwoven fabric with a high-pressure fountain is known. In these cases, for example, the entangled fiber length is 3 to 150 mm, and the orifice nozzles are opened in one or two rows with a pitch of 0.5 to 2 mm. Further, the suction box for discharging the jetted high-pressure fountain has a slit having a width of 3 to 20 mm, and entangles the nonwoven fabric while moving it in the longitudinal direction.

[0003]

However, in the above-mentioned entanglement, since the orifice nozzles are arranged in the width direction of the non-woven fabric, there are the following drawbacks. The pitch of the orifice nozzle is determined corresponding to the hole diameter, and is about 0.5 mm at the minimum. Therefore, the fibers of the non-woven fabric that are entangled are restrained from moving in the width direction, the entanglement in the width direction becomes insufficient, and the strength in the width direction is not increased. Moreover, as a result of easy expansion and contraction in the width direction, there is a disadvantage that the nonwoven fabric is contracted in the width direction during processing while pulling the nonwoven fabric in the longitudinal direction while running. Even so, increasing the pitch of the orifice nozzle lowers the density of the jet water and lowers the entanglement itself. On the other hand, the width of the slit of the suction box is determined according to the exhaust volume of the exhaust device connected thereto. The larger the width, the more advantageous the entanglement, but the larger the exhaust device becomes. This invention eliminates these drawbacks, a method for manufacturing a non-woven fabric,
A non-woven fabric manufacturing apparatus and a non-woven fabric produced by these are provided.

[0004]

In the present invention, the arrangement of the orifice nozzles is oblique with respect to the width direction of the non-woven fabric, and the non-woven fabric is basically used. Accordingly, the suction hole is aligned with the direction of the nozzle unit that bore this orifice nozzle. When a nozzle unit in which an orifice nozzle is perforated in a spiral shape is used, a suction cylinder facing the nozzle unit is provided, and suction holes having the same spiral angle as the nozzle unit are arranged in the suction cylinder.

[0005]

Function The entanglement is performed by the fibers of the non-woven fabric being entangled with each other by the high-pressure jet water from the orifice nozzle. At this time, the water contained in the non-woven fabric hinders the movement of the fibers, so that it is quickly removed by the suction box. In this invention, the orifice nozzles are arranged in a diagonal direction (angle α) with respect to the width direction of the nonwoven fabric to facilitate the movement of the fibers in the width direction, and the pitch in the width direction has a peculiar pitch of P. Then, it is reduced to P · cosα, and the entanglement in the lateral direction of the nonwoven fabric is improved. Further, the suction box is also arranged at an angle α, and the vertical width of the width W peculiar to the slit is expanded to W / cos α (however, in the case of claim 5 in claim 3). The same applies to the invention according to claim 6.

[0006]

Embodiments of the present invention will be described in detail below with reference to the drawings. First, in FIG. 1, all of 1a, 1b and 1c are rolls. Of these rolls, 1a is a drive roll, which is driven in the direction indicated by the arrow by power not shown. Reference numeral 1b is a known meandering prevention roll, and together with 1c is a free rotation roll. An endless belt 1d is wound around these rolls 1a, 1b and 1c. The endless belt 1d is formed of a mesh of synthetic resin. N is a non-woven fabric to be entangled, and it is transferred on the endless belt 1d in the vertical direction shown by the arrow X in FIG.

Reference numeral 2 denotes a nozzle unit which is arranged above the nonwoven fabric N and forms an angle α with the lateral direction shown by the arrow Y in the figure. Reference numeral 3 denotes a suction box which is arranged facing the nozzle unit 2 and along the lower surface of the endless belt 1d (Examples corresponding to claims 1, 2, 3 and 5).

In FIG. 2 below, 2a is the main body of the nozzle unit 2, which is formed in a substantially cylindrical shape and is configured to withstand the pressure of the high pressure water supplied. A groove 2b is opened in the longitudinal direction of the lower surface of the main body 2a, and a nozzle plate 2c is provided inside the groove 2b. Nozzle plate 2c
In this case, orifice nozzles 2d are perforated in one or two rows at a pitch P in the longitudinal direction to face the grooves 2b. Reference numeral 2e denotes a high-pressure water supply port opened at one end of the main body 2a and connected to a high-pressure water pump (not shown) (an embodiment corresponding to claim 3).

Reference numeral 3a is a main body of the suction box 3, which has a box shape in the longitudinal direction. A rectangular flat surface 3b is formed on the upper surface of the main body 3a, and a slit 3d having a width W and serving as a suction hole 3c is formed in the flat surface 3b. 3e is the main body 3
It is a suction port that is opened at one end of a and is connected to an intake blower (not shown) to suck the water inside with the air.

FIG. 3 corresponding to claim 6 will be described below. In this embodiment, there is provided a nozzle unit 2 in which orifice nozzles 2d are arranged and drilled in a spiral shape. 3
Is a suction cylinder facing the nozzle unit 2 and having a suction hole 3c having the same spiral angle. The suction cylinder 3 has suction holes 3c arranged at equal intervals on the outer circumference thereof, that is, in the shape of a plurality of screws. The suction cylinder 3 is rotated by a power not shown,
The non-woven fabric N is wound around this and moved in the direction shown by the arrow in the figure, the interior of the suction cylinder 3 is evacuated, and entanglement is performed. It should be understood that other configurations are almost the same as those of FIG.

Further, FIGS. 4 and 5 corresponding to claim 4 will be described. In this embodiment, the orifice nozzle 2d is
The nozzle unit 2 is arranged in a direction that is oblique to the longitudinal direction (Y direction in the drawing) of the nozzle unit 2. The longitudinal direction of the nozzle unit 2 is arranged in the same direction as the width direction of the nonwoven fabric N. A suction cylinder 3 is provided corresponding to the nozzle unit 2 of this embodiment. This suction cylinder 3 has suction holes 3c arranged at equal intervals on its outer circumference in the axial direction. It should be understood that other configurations are almost the same as those of FIG. Further, in this embodiment, the suction box 3 may be used instead of the suction cylinder 3.

Next, regarding the non-woven fabric N of the embodiment of claim 7,
6 will be described (FIG. 7 shows a conventional nonwoven fabric. FIGS. 6 and 7 both use the apparatus shown in FIG. 1). FIG. 6 is an enlarged view of the nonwoven fabric N in this embodiment. According to this drawing, the nonwoven fabric fibers between the perforations H by the high pressure jet water from the orifice nozzle 2d are well entangled in both the vertical and horizontal directions (the vertical and horizontal directions of the nonwoven fabric N). The strength is improved in both vertical and horizontal directions. On the other hand, in FIG. 7, the perforations H communicate with each other in the vertical direction, and have the drawbacks that the strength decreases in the horizontal direction and the elongation increases.
This is due to insufficient lateral entanglement of the fibers as described above. The data of the embodiment shown in FIG. 6 has a basis weight of 20 g / m ² , a nozzle 2d hole diameter of 160 microns, a pitch of 1 mm, and an angle α60.
The water pressure is 30 kg / cm ² .

As described above, according to the present invention, since the orifice nozzles are arranged at an angle α with respect to the width direction of the non-woven fabric and the suction holes are arranged correspondingly,
It has the following unique effects. The pitch in the width direction of the nonwoven fabric of the orifice nozzle is narrowed to P · cosα with respect to the pitch P of the orifice nozzle of the nozzle unit itself, and at the same time, the movement of the nonwoven fabric in the width direction is facilitated, so that the lateral strength of the nonwoven fabric is improved. On the other hand, if the width of the suction hole is W, the width in the longitudinal direction of the non-woven fabric is expanded to W / cos α, so that water that obstructs the movement of the fibers of the non-woven fabric can be quickly removed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a perspective view of still another embodiment.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is an enlarged view of a nonwoven fabric of one example.

FIG. 7 is an enlarged view of a conventional nonwoven fabric.

[Explanation of symbols]

 2 nozzle unit 2d orifice nozzle 3 suction box or cylinder 3c suction hole

Claims (7)

[Claims] 1. The method for producing a non-woven fabric according to the method for producing a non-woven fabric by hydroentangling, wherein orifice nozzles for generating the water flow are arranged obliquely with respect to the width direction of the non-woven fabric. 2. The method for manufacturing a nonwoven fabric according to claim 1, wherein suction holes correspond to the arrangement of the orifice nozzles. 3. A non-woven fabric manufacturing apparatus using hydroentanglement, wherein nozzle units, in which orifices nozzles for generating the water flow are aligned and perforated in the longitudinal direction of the nozzle unit, are arranged diagonally to the width direction of the non-woven fabric. The non-woven fabric manufacturing apparatus. 4. The nonwoven fabric manufacturing apparatus by hydroentanglement, wherein orifice nozzles for generating a water flow in the previous period are arrayed and perforated obliquely with respect to the longitudinal direction of the nozzle unit. 5. The nonwoven fabric manufacturing apparatus according to claim 3 or 4, wherein a suction box having a linearly opened suction hole is arranged facing the nozzle unit. 6. A non-woven fabric manufacturing apparatus by hydroentanglement, comprising a nozzle unit in which orifice nozzles for generating the water flow are perforated in a spiral shape, and a suction cylinder facing the nozzle unit, and the suction cylinder is provided with the nozzle. The nonwoven fabric manufacturing apparatus, wherein the saxion holes are arranged with the same spiral angle as that of the unit. 7. A non-woven fabric entangled by a water flow from an orifice, wherein the orifice is disposed obliquely to the width direction of the nonwoven fabric to improve the width and strength of the nonwoven fabric. Non-woven fabric.