JPH06184894A - Nozzle plate - Google Patents

Abstract

PURPOSE:To provide a nozzle plate giving a fiber sheet having inconspicuous wale streak in the moving direction of a conveyor and a fiber sheet having various appearances. CONSTITUTION:The nozzle plate has fluid-ejection holes arranged in zigzag pattern and the ejection holes in the same row have the same fluid ejection angles. Since the fluid ejected from the fluid-ejection holes of the same row exerts the same action on a fiber web, a uniform fiber sheet having regularity can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle plate for a fluid flow entanglement device which applies a fluid flow, particularly a water stream, to a fiber web to entangle fibers.

[0002]

2. Description of the Related Art Conventionally, there has been known a device for obtaining a fiber sheet by entanglement of fibers by applying a fluid flow such as a high-pressure water flow to a fiber web, but the fluid flow is applied while moving the fiber web on a conveyor. Therefore, only a fiber sheet having vertical streaks due to the fluid flow was obtained in the flow direction of the conveyor.

For this reason, various means have been taken, such as causing the fluid flow to act while oscillating in a direction perpendicular to the flow direction of the fibrous web, or applying two or more rows of fluid flows. Only a halfway fiber sheet was obtained in which the vertical streaks due to the flow were conspicuous.

[0004]

The present invention has been made in order to solve the above problems, and obtains a fiber sheet in which vertical stripes in the flow direction of the conveyor are not noticeable and a fiber sheet having various appearances. It is an object of the present invention to provide a nozzle plate that can be used.

[0005]

According to the present invention, a plane A perpendicular to the horizontal axis of a plate, a plane B perpendicular to the vertical axis of the plate, and a plane perpendicular to any of the planes A and B are provided. C
, A locus obtained by projecting the locus of the fluid ejected from the fluid ejection hole (L _A1 , _... , L _An or L _B1 , _... , L _Bn or L _C1 , _... , L _Cn , n is a natural number) the projection angle alpha ₁ which is defined below, _{· ·,} alpha _n, projection angle beta _{1, · ·,} beta _n, projection angle gamma _{1, · ·,} but at least one of gamma _n, 70 ° or more, 9
A nozzle plate having at least one fluid ejection hole of less than 0 °.

Projection angles α ₁ , _... , α _n : The horizontal axis of the nozzle plate is plane A
It means the minimum angle formed by a straight line that passes through the point projected on and is parallel to the vertical axis. Projection angles β ₁ , _... , β _n : The vertical axis of the nozzle plate is the plane B
It means the minimum angle formed by a straight line that passes through the point projected on and is parallel to the horizontal axis. Projection angles γ ₁ , _... , γ _n : minimum angle formed by a straight line parallel to the horizontal axis, passing through a point where the thickness axis of the nozzle plate is projected on the plane C.

In the nozzle plate of the present invention, the fluid injection holes are arranged in a row in parallel with the horizontal axis of the nozzle plate, and only the projection angles α ₁ , _... , α _n are 70 ° or more, 9
Is less than 0 °, in particular, the projection angles α ₁ , _... , α _n of arbitrary fluid ejection holes in the same row are the same, and the projection angles α _{1 ′} of arbitrary fluid ejection holes in the other row are _... When α _{n ′ is} also the same, the fiber web can be closely entangled with each other, and a fiber sheet having no vertical stripes can be obtained.

The projection angle β ₁ , _... , β _n is 70 ° or more, 90
When the angle is less than 0 °, a fiber sheet having a regular appearance can be obtained, and the projection angles β ₁ , _··· , β _n and the projection angles γ ₁ , _··· , γ _n are all 70 ° or more, Less than 90 °,
With the same projection angle, a fiber sheet having a uniform regular appearance can be obtained.

A locus L _{Bm of the} fluid ejected from the fluid ejection hole
When the locus L _{Bm ′ of the} fluid ejected from the fluid ejection hole near the fluid ejection hole intersects at approximately one point, a fiber sheet having a portion with a high degree of entanglement and a portion with a low degree of entanglement can be obtained.
When the locus L _Am of the fluid ejected from the fluid ejecting hole and the locus L _{Am 'of the} fluid ejected from the fluid ejecting hole near the fluid ejecting hole overlap and / or intersect with each other, a uniform or strong entanglement occurs. A combined fiber sheet can be obtained.

[0010]

The nozzle plate of the present invention has a plane A perpendicular to the horizontal axis of the plate, a plane B perpendicular to the longitudinal axis of the plate, and a plane C perpendicular to any of the planes A and B. Of a trajectory (L _A1 , _... , L _An or L _B1 , _... , L _Bn or L _C1 , _... , L _Cn , n is a natural number) obtained by projecting the trajectory of the fluid ejected from the fluid ejection hole, Projection angle α ₁ , _...
At least one of α _n , the projection angle β ₁ , _... , β _n , and the projection angle γ ₁ , _... , γ _n has at least one fluid injection hole whose angle is 70 ° or more and less than 90 °. Therefore, the fluid flow is caused to act densely on the fibrous web so that the vertical streaks are entangled so as not to be conspicuous, or the fiber web is entangled with a regularity in the jet direction of the fluid flow, and It has become possible to obtain fiber sheets having a certain surface condition and a degree of entanglement.

The fluid injection holes of the nozzle plate of the present invention may be arranged at random, or may be arranged in two or more rows. There is no particular limitation, but the latter is easier to design. Is.

Particularly when the nozzle plate of the present invention is used to make the vertical stripes inconspicuous, it is more preferable to arrange the fluid injection holes in two or more rows as in the latter case. When the fluid ejection holes are in two rows as illustrated in FIG. 1A, the fluid ejection holes in the second row are preferably located between the adjacent fluid ejection holes in the first row with respect to the vertical axis direction of the nozzle plate. For 1
By arranging them in a staggered manner in the middle of the adjacent fluid ejection holes in the row, it is easy to perform the entanglement treatment uniformly over the entire fibrous web without the fluid flows intersecting each other. Also, FIG.
When the fluid ejection holes are in three rows as illustrated in (b) and (c), the fluid ejection holes in the second row are located between the adjacent fluid ejection holes in the first row with respect to the vertical axis direction of the nozzle plate. It is preferable that the fluid ejecting holes in the third row are arranged so as not to overlap with each other, and the fluid ejecting holes in the third row do not overlap between the adjacent fluid ejecting holes in the second row. In this case, if the rows are arranged in a zigzag manner between the adjacent rows, it is easy to uniformly perform the entanglement treatment over the entire fibrous web without the fluid flows intersecting each other. Also,
As shown in FIG. 1 (c), the fluid ejecting holes in the third row and the fluid ejecting holes in the first row may be overlapped with each other, but they are not overlapped with each other (see FIG. 1 (b))
Is more preferable. Although not shown,
Even when the fluid injection holes are arranged in four or more rows,
When the same relationship as above is established, it is easy to obtain a fiber sheet in which vertical streaks are inconspicuous.

The horizontal axis in the present invention refers to a straight line that passes through the center of gravity of the nozzle plate and is parallel to the long side of the nozzle plate, and the vertical axis is the plane that is parallel to one side of the nozzle plate including the horizontal axis. A straight line that passes through the center of gravity of the nozzle plate and is perpendicular to the horizontal axis, and a thickness axis refers to a straight line that passes through the center of gravity of the nozzle plate and is perpendicular to a plane parallel to one surface of the nozzle plate including the horizontal axis.

As described above, when the fluid ejection holes are arranged in rows and the vertical stripes are not conspicuous, the number of fluid ejection holes in the same row is preferably 24 to 10 holes / cm. If the number is less than 24 holes / cm, the pitch becomes short, so that adjacent fluid streams are likely to interfere with each other and it is difficult to uniformly entangle, and if the number is more than 10 holes / cm, the pitch becomes large. This is because it becomes longer and the vertical stripes are more visible. More preferably, it is 20 to 15 holes / cm.

The diameters of the fluid ejection holes may be different depending on the respective fluid ejection holes, but when they are arranged in a row, the entanglement action by the fluid flow in the same row is the same. It is more preferable that the fluid injection holes in the same row have the same diameter. If the diameter of the fluid injection hole is smaller than 0.05 mm, the energy of the injected fluid flow is small, and the confounding process cannot be performed efficiently. On the contrary, if it is larger than 0.2 mm, the fibers are hard to be entangled. Therefore, the pore diameter is preferably 0.05 to 0.2 mm, more preferably 0.0
It is 7 to 0.15 mm.

Further, in the case where the fluid injection holes are arranged in rows, if the distance between rows is less than 0.5 mm, the fluid flows in adjacent rows are likely to interfere with each other, and conversely, if the distance exceeds 2 mm, the fluid flow is exceeded. Since the angle of incidence on the fiber web tends to be large and the fibers cannot be uniformly entangled with each other, the inter-row distance is preferably 0.5 mm to 2 mm, more preferably 0.5 to 1 mm. The inter-row distance of the fluid ejection holes means the distance between a straight line passing through the center of the fluid ejection holes in the front row and a straight line passing through the center of the fluid ejection holes in the rear row.

The nozzle plate of the present invention has a plane A perpendicular to the horizontal axis of the plate, a plane B perpendicular to the vertical axis of the plate, and a plane C perpendicular to any of the planes A and B. On the other hand, a locus (L _A1 , _... , L _An or L _B1 , _... , L _Bn or L) obtained by projecting the locus of the fluid ejected from the fluid ejection hole.
_C1 , _... , L _Cn , n is a natural number), projection angle α ₁ , _... ,
At least one of α _n , the projection angle β ₁ , _... , β _n , and the projection angle γ ₁ , _... , γ _n has at least one fluid ejection hole whose angle is 70 ° or more and less than 90 °. It became possible to obtain various fiber sheets. That is, the projection angle α
₁ , _... , When α _n is 70 ° or more and less than 90 °, the fiber web can act more finely and without a time lag, so that a fiber sheet with no vertical stripes can be obtained. When the projection angles β ₁ , _... , β _n are 70 ° or more and less than 90 °, the fiber sheet has a regular projection because it has a certain projection angle with respect to the width direction of the fiber web. , The projection angle γ ₁ , _... , γ _n is 70 ° or more, 9
When the angle is less than 0 °, the region acting on the fiber web can be specified, so that a fiber sheet having a portion with a high degree of entanglement and a portion with a low degree of entanglement can be obtained. The trajectory of the fluid ejected from the fluid ejection hole of the present invention means the center of the trajectory of the fluid.

First, in the case of obtaining a fiber sheet in which vertical streaks are inconspicuous by the nozzle plate of the present invention, if the fluid injection holes are arranged in a row parallel to the horizontal axis of the nozzle plate, the fluid flows interfere with each other. The entanglement action of the fluid flow is not attenuated, and it is easy to design so that the action can be performed more precisely, and the fluid flow having a uniform entanglement action can be ejected. .

Further, in this case, it is more preferable that only the projection angles α ₁ , _··· , α _n are 70 ° or more and less than 90 °.
If the projection angles α ₁ , _... , α _n are less than 70 °, the angle of incidence of the fluid flow on the fiber web is small, so that the fiber web acts not only to entangle but to break the fiber web. This is because if the projection angles α ₁ , _... , α _n are 90 °, there is a time difference in which the fluid flow acts on the fibrous web, and the entanglement cannot be performed uniformly. If the projection angle alpha _{1, · ·,} projection angle beta ₁ except alpha _{n, · ·,} beta _n or projection angle gamma _{1, · ·,} gamma _n is 70 ° or more is less than 90 °, to the fibrous web Since the angle of incidence of is different for each fluid injection hole, the force acting on the fiber web is not uniform, and the vertical stripes are more noticeable. Therefore, the projection angles β ₁ , _... , β _n are 90
, The projection angles γ ₁ , _... , γ _n are preferably 90 ° or 0 °. In the present invention, when the trajectory of the fluid ejected from the fluid ejection hole is projected to the plane A, the plane B, or the plane C and not a line but a point, the projection angle is set to 0 °. .

Further, the fluid jetting holes form a row, the projection angles α ₁ , _... , α _n of the arbitrary fluid jetting holes in the same row are the same, and the projection angles of the arbitrary fluid jetting holes in the other rows are the same. If α _{1 ′} , _... , α _{n ′} are the same, FIG.
As shown in (b) and FIGS. 3 (a) and 3 (b), since all intersect at the same point and pass through this point and are on a straight line perpendicular to the plane A, this straight line is If the nozzle plate is installed so as to be aligned with the upper surface, the middle, or the lower surface, it is possible to act uniformly and densely without causing a time difference, so that it is possible to obtain a fiber sheet in which vertical stripes are inconspicuous.

When the fluid injection holes are arranged in three rows, as shown in FIG.
As shown in (a) and (b), all loci L _A1 , _... , L
_An may intersect at one point, but at least two loci may intersect.

Next, in order to obtain a fiber sheet having a regular appearance, the projection angles β ₁ , _... , β _n are 70 ° or more, 9
It is preferably less than 0 °. This is because the fluid flow acts on the fiber web at a certain angle of incidence, so that the entanglement direction is substantially the same as the angle of incidence, and a fiber sheet having a regular appearance can be obtained. If the projection angles β ₁ , _... , β _n are less than 70 °, the angle of incidence of the fluid flow on the fiber web is too small and the fiber web is broken rather than entangled, and the projection angle β ₁ , _... , β _n is 9
If it is 0 °, the longitudinal streaks are uniformly entangled so as to be inconspicuous, and a fiber sheet having a regular appearance cannot be obtained.

Further, if any of the projection angles β ₁ , _··· , β _n and the projection angles γ ₁ , _··· , γ _n is 70 ° or more and less than 90 ° and has the same projection angle, it is more uniform. In addition, a fiber sheet having a regular appearance can be obtained.

The state of the fluid flow ejected from such a fluid ejection hole is, for example, as shown in FIGS. 4 (a) (b) and 5 (a).
The state is as shown in (b), FIG. 6, and FIGS. 7 (a) and (b). FIG. 4A shows the case where the projection angles β ₁ , _... , β _n are all the same, and a fiber sheet having a uniformly fluffed surface can be obtained. Note that it is not necessary that the projection angles β ₁ , _... , β _n are all the same as in FIG.

FIG. 5A shows the case where the projection angles γ ₁ , _... , γ _n are all the same, and the projection angles β ₁ , _... , β _n are all the same as in FIG. 4A. And if the projection angles γ ₁ , _... , γ _n are all the same, then
All fluid streams have the same entanglement action on the fiber web,
A fiber sheet having a more uniformly fluffed surface can be obtained. Further, as shown in FIG. 5B, the projection angle γ ₁ ,
_..., there is no need at all are all also γ _n same.

FIG. 6 shows the case where the projection angles β ₁ , _... , β _n have fluid injection holes of 90 °, and thus the loci L _B1 , _... , L _Bn are entangled with each other. A fiber sheet having a similar fluffy surface can be obtained if the orientation is not offset. In this case, as shown in FIG. 7A, even if the fluid flow acts on the fiber web at the same time,
As shown in FIG. 7B, a time lag may be provided to act.

Then, in the case of obtaining a fiber sheet having a portion having a high entanglement strength and a portion having a low entanglement strength, FIG.
As illustrated in (c), the trajectory L _Bm of the fluid ejected from the fluid ejection hole and the trajectory L _{Bm ′ of the} fluid ejected from the fluid ejection hole near the fluid ejection hole intersect at approximately one point. Preferably. This is because the fluid ejected from the fluid ejection holes intersects at approximately one point, so when the fiber web is acted at this point, the degree of entanglement is high in the vicinity of this point, but at a point a little away from this point. This is because the degree of entanglement becomes low. The vicinity in the present invention means that the center of the fluid ejection hole is within 0.4 mm of the center of the fluid ejection hole which is the basis of the locus L _Bm .

Further, when the locus L _Am of the fluid ejected from the fluid ejection hole and the locus L _{Am 'of the} fluid ejected from the fluid ejection hole near the fluid ejection hole overlap and / or intersect with each other, it becomes more uniform. Alternatively, it is possible to firmly obtain a fiber sheet having portions having different degrees of entanglement. The fact that the locus L _Am and the locus L _{Am '} overlap means that the fluid ejection holes having these loci are on a straight line perpendicular to the plane A, and only the ejection directions on the plane B are different. The difference in this direction is canceled when the fluids substantially collide with each other, so that they can be uniformly entangled. On the other hand, the locus L
_The intersection of _Am and the locus L _{Am ′} means that the fluid ejection holes that are the basis of these trajectories are not on a straight line perpendicular to the plane A, and therefore these fluids substantially collide. In this case, the entanglement action is not canceled out, so that the entanglement can be performed firmly.

Incidentally, like the latter, the locus L _Am and the locus L
_{When Am '} intersects, as shown in FIGS. 2 (a), (b) and FIGS. 3 (a), (b), when two fluid flows intersect, three fluid flows intersect. There is a case to do.
Further, as a case where the loci L _C1 , _... , L _Cn intersect, a case as shown in FIGS. 9A and 9B can be exemplified. FIG. 9 (a)
9B is a case where two fluid flows in the second row substantially collide with one fluid flow in the first row, and FIG. 9B shows that one fluid flow in the second row becomes one fluid flow in the first row. This is the case when there is a substantial collision.

Examples of the nozzle plate of the present invention will be shown below, but the present invention is not limited to these examples.

[0031]

【Example】

(Example 1) A fiber web having a basis weight of 80 g / m ² obtained by carding polyester fiber having a fineness of 1.5 denier and a fiber length of 51 mm was arranged at right angles to the flow direction of the fiber web as shown below. Spray water from the nozzle plate,
The fibers were entangled to obtain a fiber sheet. In this fiber sheet, vertical streaks due to water flow were not conspicuous and the surface condition was uniform.

(1) The fluid injection holes are arranged in two rows in a staggered pattern. (2) The number of fluid ejection holes in each row is 15 holes / cm. (3) The diameter of the fluid injection holes is 0.15 mm for both the first and second rows.
Is. (4) The distance between the rows of fluid ejection holes is 0.7 mm. (5) As shown in FIG. 2A, the projection angles α ₁ , _... , α _n
Are all 85.22 °, and the projection angles β ₁ , _... , β _n and the projection angles γ ₁ , _... , γ _n are all 90 °. (6) The locus L _A1 and the locus L _A2 are arranged so that the intersections thereof coincide with the lower surface of the fiber web. (7) The discharge pressure of the water stream is 10 MPa.

(Example 2) A fibrous web obtained in the same manner as in Example 1 was jetted with water from a nozzle plate as shown below, which was arranged at right angles to the flow direction of the fibrous web.
The fibers were entangled to obtain a fiber sheet. The fiber sheet had a comb-like surface condition.

Note (1) The fluid injection holes are arranged in two rows in a staggered pattern. (2) The number of fluid ejection holes in each row is 15 holes / cm. (3) The diameter of the fluid injection holes is 0.15 mm for both the first and second rows.
Is. (4) The distance between the rows of fluid ejection holes is 0.7 mm. (5) As shown in FIG. 7 (b), the projection angle beta ₁ in the first column, _{· ·,} beta _n is 90 degrees, the projection angle gamma _{1, · ·,} gamma _n is 0 DEG, 2 columns The eye projection angles β ₁ , _... , β _n are 80 °, and the projection angles γ ₁ , _... , γ _n are 60 °. (6) Like the plane B of FIG. 6, adjacent loci (for example,
The locus L _B1 and the locus L _B2 ) are arranged so that the intersections of the loci L _B1 and L _B2 ) coincide with the lower surface of the fiber web. (7) The discharge pressure of the water stream is 10 MPa.

(Example 3) A fibrous web obtained in the same manner as in Example 1 was jetted with water from a nozzle plate as shown below, which was placed at a right angle to the flow direction of the fibrous web.
The fibers were entangled to obtain a fiber sheet. This fiber sheet had a part with a high degree of entanglement and a part with a low degree of entanglement.

Note (1) The fluid injection holes are arranged in two rows as shown in FIG. 9B. (2) The number of fluid ejection holes in the first row is 14 holes / cm, and the number of fluid ejection holes in the second row is 7 holes / cm. (3) The diameter of the fluid injection holes is 0.12 mm in both the first and second rows.
Is. (4) The distance between the rows of fluid ejection holes is 0.8 mm. (5) As shown in FIG. 9B, the projection angles β ₁ , _... , β _n in the first column are 90 °, the projection angles γ ₁ , _... , γ _n are 0 °, and the second column is The projection angles β ₁ , _... , β _n are 85 °, and the projection angles γ ₁ , _... , γ _n are 70 °. (6) As shown in plane B of FIG. 8C, the loci are arranged so that the intersections of the adjacent loci (for example, loci L _B1 and L _B2 ) coincide with the lower surface of the fiber web. (7) The discharge pressure of the water stream is 10 MPa.

[0037]

According to the nozzle plate of the present invention, the projection angle of the locus projected on any one of the plane A, the plane B, and the plane C is 70.
Since it has a fluid injection hole of not less than 90 ° and less than 90 °, it can be entangled more uniformly to obtain a fiber sheet in which vertical stripes are inconspicuous or a fiber sheet having a regular appearance can be obtained. It is possible to obtain a fiber sheet having a portion having a high degree of entanglement and a portion having a low degree of entanglement.

In the nozzle plate of the present invention, the fluid injection holes are arranged in a row in parallel with the horizontal axis of the nozzle plate, and only the projection angles α ₁ , _... , α _n are 70 ° or more, 9
Is less than 0 °, in particular, the projection angles α ₁ , _... , α _n of arbitrary fluid ejection holes in the same row are the same, and the projection angles α _{1 ′} of arbitrary fluid ejection holes in the other row are _... When α _{n ′ is} also the same, the fiber web can be closely entangled with each other, and a fiber sheet having no vertical stripes can be obtained. for that reason,
The fiber sheet thus obtained is subjected to a post-process such as coating to produce a backing material such as artificial leather or artificial leather,
It can be used as an interlining material for clothing.

Further, the projection angle β _{1, ··,} β _n is 70 ° or more is less than 90 °, it is possible to obtain a fiber sheet having an appearance having regularity, the projection angle beta _{1, · ·,} When β _n and projection angles γ ₁ , _... , γ _n are all 70 ° or more and less than 90 ° and have the same projection angle, a fibrous sheet having a uniform regular appearance can be obtained.

Furthermore, when the locus L _Bm of the fluid ejected from the fluid ejection hole and the locus L _{Bm 'of the} fluid ejected from the fluid ejection hole near the fluid ejection hole intersect at substantially one point, they are entangled. A fiber sheet having a high degree part and a low degree part is obtained. The locus L _{Am of the} fluid ejected from the fluid ejection hole
When and the locus L _{Am ′ of the} fluid ejected from the fluid ejection hole near the fluid ejection hole overlap and / or intersect with each other, a fibrous sheet uniformly or strongly entangled can be obtained. The fibrous sheet thus obtained has strength, and has a portion having a low degree of entanglement and excellent retention, and thus can be effectively used for applications such as wipers.

[Brief description of drawings]

1A is an example of a plan view of a nozzle plate, FIG. 1B is an example of a plan view of a nozzle plate, and FIG. 1C is an example of a plan view of a nozzle plate.

FIG. 2A is an example of a diagram showing a trajectory projected on a plane A. FIG. 2B is an example of a diagram showing a trajectory projected on a plane A.

FIG. 3A is an example of a diagram showing a trajectory projected on a plane A. FIG. 3B is an example of a diagram showing a trajectory projected on a plane A.

FIG. 4A is an example of a diagram showing a trajectory projected on a plane B. FIG. 4B is an example of a diagram showing a trajectory projected on a plane B.

5A is an example of a diagram showing a trajectory projected on a plane C. FIG. 5B is an example of a diagram showing a trajectory projected on a plane C. FIG.

FIG. 6 is an example of a diagram showing a trajectory projected on a plane B.

7A is an example of a diagram showing a trajectory projected on a plane C. FIG. 7B is an example of a diagram showing a trajectory projected on a plane C. FIG.

8A is an example of a diagram showing a locus projected on a plane B, FIG. 8B is an example of a diagram showing a locus projected on a plane B, and FIG. 8C is an example of a diagram showing a locus projected on a plane B.

9A is an example of a diagram showing a trajectory projected on a plane C. FIG. 9B is an example of a diagram showing a trajectory projected on a plane C. FIG.

[Explanation of symbols]

1 Nozzle plate A plane A B plane B C plane C L _A1 , _... , L _An locus projected on plane A L _B1 , _... , L _Bn locus projected on plane B L _C1 , _... , L _Cn plane C Projected angle on the plane α ₁ , _··· , α _n plane A β ₁ , _··· , projected angle on β _n plane B γ ₁ , _··· , projected angle on plane γ _n

Claims (7)

[Claims] 1. In a horizontally elongated nozzle plate for fluid entanglement having a plurality of fluid ejection holes, a plane A perpendicular to the horizontal axis of the plate, a plane B perpendicular to the vertical axis of the plate, and the plane. A trajectory (L _A1 , _... , L _An or L _B1 , _... , L _Bn or L) obtained by projecting the trajectory of the fluid ejected from the fluid ejection hole onto a plane C that is perpendicular to both A and plane B. _{C 1} , _... , L _Cn , where n is a natural number), projection angles α ₁ , _... , α _n , projection angles β ₁ , _... , β _n , projection angles γ ₁ , _... , γ defined below. _At least one of _n is 70 ° or more, 9
A nozzle plate having at least one fluid ejection hole having an angle of less than 0 °. Projection angle α ₁ , _... , α _n : The horizontal axis of the nozzle plate is plane A
It means the minimum angle formed by a straight line that passes through the point projected on and is parallel to the vertical axis. Projection angles β ₁ , _... , β _n : The vertical axis of the nozzle plate is the plane B
It means the minimum angle formed by a straight line that passes through the point projected on and is parallel to the horizontal axis. Projection angles γ ₁ , _... , γ _n : minimum angle formed by a straight line parallel to the horizontal axis, passing through a point where the thickness axis of the nozzle plate is projected on the plane C. 2. The fluid injection holes are arranged in a row parallel to the horizontal axis of the nozzle plate, and the projection angle α ₁ ,
_{· ·,} Alpha _n only 70 ° or more, the nozzle plate according to claim 1, wherein the less than 90 °. 3. The projection angles α ₁ , _... , α _n of arbitrary fluid ejection holes in the same row are the same, and the projection angles α _{1 ′} , _... , α _n'of arbitrary fluid ejection holes in another row. 3. The nozzle plate according to claim 2, wherein the same is true. 4. The projection angles β ₁ , _... , β _n are 70 ° or more, 9
The nozzle plate according to claim 1, wherein the nozzle plate is less than 0 °. 5. The projection angles β ₁ , _... , β _n and the projection angles γ ₁ , _... , γ _n are both 70 ° or more and less than 90 °,
The nozzle plate according to claim 4, wherein the nozzle plate has the same projection angle. 6. A trajectory L of a fluid ejected from a fluid ejection hole.
_Bm and, the locus L _{Bm 'of} the fluid ejected from the fluid injecting hole in the vicinity of the fluid injection hole, but the nozzle plate according to claim 1, wherein the intersecting at one point substantially. 7. A trajectory L of a fluid ejected from a fluid ejection hole.
_Am and, fluid injection hole nozzle plate according to claim 6, wherein the locus L _{Am 'of} the fluid ejected from the fluid injecting hole in the vicinity of and wherein the overlapping and / or crossing of.