JP6311350B2 - Perforated plate for liquid filling nozzle and liquid filling apparatus - Google Patents

Description

  The present invention relates to a perforated plate used for a liquid filling nozzle used when filling a container with a desired liquid at high speed, and a liquid filling apparatus.

In a liquid filling apparatus that fills a container with a fixed amount of liquid at a high speed, a liquid filling nozzle having a discharge port on the lower end side is used. In order to prevent the liquid filling nozzle from being filled with a fixed amount of liquid and preventing the liquid from falling into the container after the liquid filling is stopped, the liquid filling nozzle is arranged in multiple stages along the flow direction of the liquid at the discharge port. Multiple meshes are installed. Conventionally, as such a mesh, a wire mesh having tangling of fine metal wires and excellent in preventing liquid drop has been used. However, the metal mesh has a problem that it is likely to be deformed or damaged by repeated high-speed liquid filling.
For this reason, a perforated plate in which a plurality of through holes are formed by etching a thin metal plate is used as a mesh instead of a wire mesh. Such a perforated plate is used by being attached to a liquid filling nozzle in a state of being laminated via an annular spacer (Patent Document 1).

JP-A-9-99914

The perforated plate as described above has no entanglement of fine metal wires, and the portion existing between adjacent through holes is wider than the fine metal wires, and is superior to a metal mesh in terms of durability. However, the liquid filling nozzle using such a perforated plate is easy to bite bubbles when the liquid passes through the through hole of the perforated plate, and the liquid level of the liquid filled in the container is bubbled and immediately seals the container. There is a problem that the efficiency of the liquid filling process is poor. In addition, there is a problem that the liquid is not sufficiently cut after the fixed amount of liquid is filled in the container, and the liquid cannot be prevented from falling into the container from the discharge port of the liquid filling nozzle.
The present invention has been made in view of the above-described circumstances, and includes a perforated plate that enables a liquid filling nozzle that prevents foaming of the liquid surface and is excellent in liquid drainage, and liquid filling into a container. An object of the present invention is to provide a liquid filling apparatus capable of performing with high efficiency.

To solve such problems, a liquid filling nozzle for perforated plate of the present invention is provided in the discharge opening neighborhood of the liquid-filled nozzle, in suppressing perforated plate from falling liquid during filling stops, one surface and has a metal substrate having a second surface opposed thereto, and a plurality of etching holes penetrating from the one surface of the metal substrate to the other surface, the surface roughness of the substrate (Ra ) is at 0.1μm or more, the ratio between the thickness T of the substrate when the half of the difference between the maximum value and the minimum value of the inner diameter in the depth direction of the through hole was set to B (B / T) is It was set as the structure which is 0.15 or less.

As another aspect of the present invention, the opening diameter of the etching through hole on the surface of the base material is in the range of 400 to 2400 μm.
Another aspect of the present invention, the thickness of the perforated plate is configured such that the range of 100 to 1000 [mu] m.
Another aspect of the present invention, the aperture ratio of the perforated plate is to be such a configuration in the range of 40% to 80%.

  The liquid filling apparatus of the present invention includes at least a fixed amount storage tank, a liquid filling nozzle, and a connection pipe connecting the fixed quantity storage tank and the liquid filling nozzle, and the liquid filling nozzle is a cylinder connected to the connection pipe. A cylindrical main body and a cylindrical discharge portion located on the downstream side of the cylindrical main body, and a plurality of meshes are attached to the cylindrical discharge portion via an annular spacer, and at least the cylinder The mesh located on the most downstream side of the shape-like discharge portion is configured to be the above-described porous plate for a liquid-filled nozzle according to the present invention.

  The liquid filling apparatus of the present invention includes at least a fixed amount storage tank, a liquid filling nozzle, and a connection pipe connecting the fixed quantity storage tank and the liquid filling nozzle, and the liquid filling nozzle is connected to the connection pipe. A cylindrical main body and a cylindrical discharge portion located downstream of the cylindrical main body, and a plurality of meshes are attached to the cylindrical discharge portion in multiple stages via an annular spacer, The mesh located at the most upstream side and / or the middle of the cylindrical discharge part is the above-described porous plate for a liquid filling nozzle of the present invention, and the mesh located at the most downstream side of the cylindrical discharge part is The structure is a wire mesh.

The porous plate of the present invention is used for a liquid filling nozzle to prevent foaming of the liquid surface when filling the liquid into the container, and the liquid after the liquid filling is stopped after filling the container with a certain amount of liquid. Falling can be suppressed.
The liquid filling apparatus of the present invention can perform liquid filling into a container with high efficiency.

FIG. 1 is a partial plan view showing an embodiment of the porous plate of the present invention. 2 is a longitudinal sectional view taken along line II of the perforated plate shown in FIG. FIG. 3 is an enlarged cross-sectional view of a portion surrounded by a chain line circle in the perforated plate shown in FIG. FIG. 4 is a cross-sectional view corresponding to FIG. 3 showing another embodiment of the porous plate of the present invention. FIG. 5 is a diagram for explaining the aperture ratio in the porous plate of the present invention. FIG. 6 is a partial plan view showing an example of the structure of the corner of the porous plate of the present invention. FIG. 7 is a cross-sectional view corresponding to FIG. 3 for explaining an example of manufacturing the porous plate of the present invention. FIG. 8 is a cross-sectional view corresponding to FIG. 4 for explaining another production example of the porous plate of the present invention. FIG. 9 is a schematic configuration diagram showing an embodiment of the liquid filling apparatus of the present invention. FIG. 10 is a schematic configuration diagram showing an embodiment of the liquid filling apparatus of the present invention. FIG. 11 is a schematic cross-sectional view showing an example of a cylindrical discharge portion of a liquid filling nozzle constituting the liquid filling apparatus of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the drawings are schematic or conceptual, and the dimensions of each member, the ratio of sizes between the members, etc. are not necessarily the same as the actual ones, and represent the same members. However, in some cases, the dimensions and ratios may be different depending on the drawing.

[Perforated plate for liquid filling nozzle]
FIG. 1 is a partial plan view for explaining an embodiment of a porous plate for a liquid-filled nozzle according to the present invention, and FIG. 2 is a longitudinal sectional view taken along line II of the porous plate shown in FIG. FIG. 3 is an enlarged cross-sectional view of a portion surrounded by a chain line circle in the porous plate shown in FIG. 1, 2, and 3, the perforated plate 11 has a plurality of through holes 13 that penetrate from one surface 12 a of the base material 12 to the other surface 12 b, and the surface roughness of the surfaces 12 a and 12 b. The thickness (Ra) is 0.1 μm or more, preferably 0.15 to 0.3 μm. When the surface roughness (Ra) of the surface 12a and the surface 12b of the substrate 12 is less than 0.1 μm, when the porous plate 11 is used as a liquid filling nozzle, the liquid drop after the liquid filling is stopped is suppressed. There are things that cannot be done. The surface roughness (Ra) is a three-dimensional roughness parameter and can be measured according to JIS B0601-2001.
The opening shape of the through-hole 13 of the perforated plate 11 is a regular hexagon in the illustrated example, but is not limited thereto, and may be, for example, a circle, a regular polygon, a rectangle, a trapezoid, an ellipse, or the like. .

Such a through-hole 13 preferably has less irregularities on its inner wall 14 and less variation in inner diameter in the depth direction. As shown in FIG. 3, the maximum value D1 of the inner diameter in the depth direction of the through-hole 13 and When the variation amount B is half of the difference from the minimum value D2 [(D1−D2) / 2], the ratio (B / T) between the variation amount B and the thickness T of the substrate 12 is 0.15 or less. , Preferably 0.1 or less. When the difference between the maximum value D1 and the minimum value D2 of the inner diameter is large and B / T exceeds 0.15, it is easy to bite bubbles when the liquid passes through the through hole 13 of the porous plate 11, and the container is filled. Bubbles tend to occur on the liquid surface. Such measurement of the inner diameter in the depth direction of the through hole 13 can be performed using a transmission type three-dimensional measuring instrument.
In the illustrated example, the portion where the inner diameter is the maximum value D1 is the open ends 13a and 13b of the through-hole 13, and the portion where the inner diameter is the minimum value D2 is the inner wall at the substantially center in the depth direction of the through-hole 13. However, the portion where the inner diameter is the maximum value D1 and the portion where the minimum value D2 is the minimum value D2 are not limited thereto.

The opening diameter of the through hole 13 can be set in consideration of the viscosity of the liquid to be filled, the filling speed, and the like, and is, for example, in the range of 400 to 2400 μm, preferably 600 to 1500 μm. The opening diameter of the through hole 13 is the opening diameter of the opening end 13a of the through hole 13 on the surface 12a side of the substrate 12 and the opening end 13b of the through hole 13 on the surface 12b side of the substrate 12. Further, when the opening diameters at the opening end 13a and the opening end 13b are different at the measurement locations as in the regular polygonal opening shape, the minimum value is set as the opening diameter as shown by an arrow in FIG.
The material of the substrate 12 of the porous plate 11 of the present invention is, for example, austenitic, ferritic, martensitic stainless steel, titanium, titanium alloy, nickel, nickel alloy, niobium, tantalum, zirconium, cobalt alloy, chromium alloy. , Molybdenum alloy, tungsten alloy and the like. In addition, the thickness of the porous plate 11 is, for example, 100 to 1000 μm, preferably 200 to 600 μm. Moreover, the external shape of the base material 12 can be appropriately set according to the shape of the liquid filling nozzle using the porous plate 11, for example, a polygon, a polygon with rounded corners, a circle, an ellipse, or the like. It may be.

Further, as shown in FIG. 4, the porous plate 11 of the present invention may be obtained by joining a plurality (three in the illustrated example) of unit porous plates 11 ′. In this case, in each unit porous plate 11 ′, the ratio (B / T) is 0.15 or less, preferably 0.1. 4 is a cross-sectional view corresponding to FIG. The unit porous plate 11 'can be joined by, for example, sintering joining, diffusion joining, arc welding, resistance welding, brazing, or the like.
The aperture ratio in the porous plate 11 of the present invention can be appropriately set in consideration of the aperture diameter of the through-hole 13, the material of the base material 12, the physical properties of the liquid to be filled, etc. Preferably it can be set as 55 to 75% of range. As shown in FIG. 5, the aperture ratio is expressed as a percentage of the sum of the opening areas of the through holes 13 in the effective liquid discharge surface 11 </ b> A when the perforated plate 11 is attached to the liquid filling apparatus. In FIG. 5, the liquid discharge surface 11 </ b> A is indicated by hatching, and the description of the through hole 13 positioned on the liquid discharge surface 11 </ b> A is omitted. Further, in the porous plate 11 of the present invention, it is preferable from the viewpoint of liquid filling stability that the opening shape of the through hole 13 existing on the liquid discharge surface 11A is the same. For example, as shown in FIG. 6, at the corner of the liquid ejection surface 11A, the opening shape is a hexagonal shape as in the case of the through holes 13 in other parts, and there are through holes having an opening size smaller than the hexagonal shape. Preferably it is not present.

  By using such a porous plate 11 of the present invention for a liquid filling nozzle, bubbling of the liquid surface during filling of the liquid into the container is prevented, and a fixed amount of liquid is filled in the container, and the liquid filling is stopped. The fall of the liquid after that can be suppressed.

Next, a production example of the porous plate of the present invention will be described using the above-described porous plate 11 as an example.
In the production of the perforated plate 11 of the present invention, first, a desired etching mask is formed on both surfaces 12a and 12b of the base material 12 having the above-described material, and penetration is performed from both surfaces of the base material 12 by wet etching or dry etching. Hole 13 is formed. FIG. 7 is a cross-sectional view corresponding to FIG. 3 showing a state in which the through hole 13 is formed by etching. As shown in FIG. 7, the through-hole 13 at this stage has protrusions such as burrs at the open ends 13 a and 13 b, and also protrudes from the inner wall 14 at the substantially center in the depth direction of the through-hole 13. 14a exists. Moreover, the surface 12a of the base material 12 and the surface 12b are in the flat state by which the surface of the used base material 12 was maintained.

  Next, a roughening process is performed on the base material 12 on which the through holes 13 are formed. For example, when the material of the base material 12 is stainless steel, the roughening treatment can be performed by immersing the base material 12 in a ferric chloride solution. By this roughening treatment, the surface 12a and the surface 12b of the substrate 12 are roughened, and the surface roughness (Ra) is in the range of 0.1 μm or more, preferably 0.15 to 0.3 μm. Further, by this roughening treatment, the inner wall 14 of the through hole 13 is roughened, and the protruding portion existing in the through hole 13 is dissolved, thereby reducing the protruding amount and eliminating the protruding portion. In the example of the perforated plate 11 shown in FIG. 3, the protruding portions such as burrs existing at the opening ends 13 a and 13 b of the through holes 13 disappear, and the protruding amount of the protruding portions 14 a existing on the inner wall 14 of the through holes 13 is reduced. Then, when the variation amount B is half of the difference between the maximum value D1 and the minimum value D2 of the inner diameter in the depth direction of the through-hole 13, the variation amount B and the base material 12 are set. The ratio (B / T) to the thickness T is 0.15 or less, preferably 0.1 or less. Thereby, the porous plate 11 of this invention as shown in FIGS. 1-3 is obtained.

  In this way, the porous plate of the present invention has removed burrs present on the inner wall of the through hole by roughening treatment, which makes it difficult for the liquid to bite bubbles when passing through the through hole of the porous plate, Since the surface of the liquid filled in the container is hard to foam and the container can be sealed immediately, the efficiency of the liquid filling process is improved. In addition, since the surface of the substrate becomes hydrophilic due to the roughening treatment, the liquid breakage after the container is filled with a fixed amount of liquid is improved, and the liquid falls into the container from the discharge port of the liquid filling nozzle. Can be prevented.

  Further, as described above, when the perforated plate 11 is formed by joining a plurality of unit perforated plates 11 ′, first, the base perforated plate 11 ′ is prepared by etching the base material 12. Then, after joining the desired number of unit porous plates 11 ', roughening treatment is performed. FIG. 8 is a cross-sectional view corresponding to FIG. 4 showing a state before the roughening process is performed. As shown in FIG. 8, at this stage, in the through holes 13 of each unit porous plate 11 ′, there are protrusions on the opening ends and the inner wall 14 at the center in the depth direction. Further, the surface 12a and the surface 12b of the base 12 of the unit porous plate 11 'located on the outermost layer side are in a flat state in which the surface of the used base 12 is maintained. By performing the roughening treatment, the surface 12a and the surface 12b are roughened, and the surface roughness (Ra) is in the range of 0.1 μm or more, preferably 0.15 to 0.3 μm. In addition, the inner wall of the through-hole 13 is roughened, and the protruding portion existing in the through-hole 13 is dissolved to cause a reduction in the protruding amount and disappearance of the protruding portion. When the variation amount B is half the difference between the maximum value D1 and the minimum value D2 of the inner diameter in the depth direction [(D1-D2) / 2], the variation amount B and the thickness T of the substrate 12 The ratio (B / T) is 0.15 or less, preferably 0.1 or less. Thereby, the porous plate 11 of the present invention as shown in FIG. 4 is obtained. In the example of the perforated plate 11 shown in FIG. 4, the burr-like protrusions present at the open ends of the through holes 13 of each unit perforated plate 11 ′ disappear due to the roughening treatment and exist on the inner wall 14 of the through holes 13. The protruding amount of the protruding portion is reduced.

As described above, a desired number of unit porous plates 11 ′ are joined before the roughening treatment because the surface of the substrate 12 after the roughening treatment has a surface roughness (Ra). This is because the thickness is 0.1 μm or more, and there is a possibility of hindering joining.
The above-described embodiments are examples, and the perforated plate for liquid-filled nozzles of the present invention is not limited to these embodiments.

[Liquid filling device]
9 and 10 are schematic configuration diagrams showing an embodiment of the liquid filling apparatus of the present invention. 9 and 10, the liquid filling device 51 of the present invention includes a fixed amount storage tank 52, a supply pipe 53 that supplies liquid to the fixed amount storage tank 52, a liquid filling nozzle 55, and a connection that connects the fixed amount storage tank 52 and the liquid filling nozzle 55. A pipe 54 is provided. The liquid filling nozzle 55 includes a cylindrical main body 56 connected to the connection pipe 54 and a cylindrical discharge portion 57 located on the downstream side of the cylindrical main body.
FIG. 11 is a schematic cross-sectional view showing an example of the cylindrical discharge portion 57 of the liquid filling nozzle 55 constituting the liquid filling apparatus 51 of the present invention. As shown in FIG. 11, a locking portion 57 a is provided at the distal end portion of the cylindrical discharge portion 57 so as to surround the discharge port 58, and a plurality of meshes 21 are provided on the locking portion 57 a with the annular spacer 31. It is mounted in multiple stages via. The outer shape of the cylindrical discharge portion 57 and the opening shape of the discharge port 58 can be appropriately set according to the shape of the container to be filled with the liquid, and may be, for example, a rectangle or a circle.

Such a cylindrical discharge part 57 is fitted on the downstream side of the cylindrical main body 56, and the tip end part 56 a of the cylindrical main body 56 connects the plurality of meshes 21 with the locking parts 57 a via the annular spacer 31. It works to fix in between. Then, liquid filling is performed in a state where the container is arranged so that the mouth portion is located at a predetermined position below the discharge port 58 of the cylindrical discharge portion 57.
In the present invention, the term “mesh” is used as a term including a perforated plate and a wire mesh.

  In the liquid filling apparatus 51 of the present invention, at least one of the plurality of meshes 21 is the porous plate for liquid filling nozzles of the present invention. In FIG. 11, three meshes 21 are the porous plate 11 for a liquid filling nozzle of the present invention. This prevents foaming of the liquid surface when filling the liquid into the container, and also prevents the liquid from falling after the liquid filling is stopped and the liquid filling is stopped, thereby increasing the liquid filling into the container. Can be done with efficiency. Furthermore, the durability of the mesh 21 is high, and the interval between mesh exchanges can be increased. In FIG. 11, the through holes 13 of the porous plate 11 for a liquid filling nozzle of the present invention, which is the mesh 21, are omitted.

  Further, the mesh 21 located on the most downstream side of the cylindrical discharge portion 57 is important in terms of preventing foaming of the liquid surface at the time of filling the liquid and suppressing liquid falling after the liquid filling is stopped. When 21 is the porous plate 11 for a liquid filling nozzle of the present invention, the other mesh 21 may be a conventional porous plate for a liquid filling nozzle or a wire mesh. As described above, the mesh 21 positioned on the most downstream side of the cylindrical discharge portion 57 is the perforated plate 11 for the liquid filling nozzle of the present invention, so that the liquid surface is prevented from foaming during the liquid filling and the liquid after the liquid filling is stopped. The effect of suppressing the fall is exerted, and the liquid can be filled into the container with high efficiency. Note that when a wire mesh is used as the other mesh 21, it is inferior to the example shown in FIG. 11 in terms of durability.

  Furthermore, when the mesh 21 located on the most upstream side or in the middle of the cylindrical discharge portion 57 is the porous plate 11 for a liquid filling nozzle of the present invention, the mesh 21 located on the most downstream side of the cylindrical discharge portion 57 is It may be a wire mesh. As described above, the mesh 21 located on the most downstream side of the cylindrical discharge portion 57 is important in terms of preventing foaming of the liquid surface during liquid filling and suppressing liquid falling after the liquid filling is stopped. This is because a conventional perforated plate for a liquid filling nozzle cannot be used as the mesh 21 located on the most downstream side. In this aspect, the effect of preventing bubbling of the liquid surface at the time of filling the liquid and suppressing the liquid drop after the liquid filling is stopped can be achieved, and the liquid can be filled into the container with high efficiency. However, since this embodiment uses a wire mesh, it is inferior to the example shown in FIG. 11 in terms of durability.

The number of meshes 21 attached to the cylindrical discharge portion 57 of the liquid filling nozzle 55 constituting the liquid filling apparatus 51 of the present invention is not limited to three.
In the liquid filling apparatus 51 of the present invention, a check valve 61 is positioned on the supply pipe 53 side of the fixed quantity storage tank 52, and a piston 63 is provided in the fixed quantity storage tank 52 so as to be movable up and down. The connection pipe 54 is also provided with a check valve 65.

Next, the operation of the liquid filling apparatus 51 of the present invention will be described with reference to FIGS. First, as shown in FIG. 9, when the piston 63 located at the rising end in the fixed amount storage tank 52 is lowered, the check valve 61 is opened and the liquid flows into the fixed amount storage tank 52 from the supply pipe 53. Then, when the piston 63 reaches the lowering end point, the liquid storage in the fixed amount storage tank 52 is finished, and the check valve 61 is closed. During this time, the check valve 65 is closed.
Next, as shown in FIG. 10, when the piston 63 located at the lowering end point in the fixed amount storage tank 52 is raised, the check valve 65 is opened, and the liquid is filled with the liquid filling nozzle 55 through the connection pipe 54. Then, liquid filling into the container (not shown) from the cylindrical discharge part 57 is started. When the piston 63 reaches the rising end point, the check valve 65 is closed, and the liquid filling is stopped. Thereby, a fixed amount of liquid is filled in the container (not shown). During this time, the check valve 61 is closed.

Such a liquid filling apparatus of the present invention prevents foaming of the liquid surface when filling the liquid into the container, and suppresses the liquid falling after the liquid filling is stopped and the liquid filling is stopped. The liquid can be filled into the container with high efficiency.
Moreover, there is no particular limitation on the shape and material of the container to be filled with the liquid by the liquid filling apparatus of the present invention. For example, various types of paper containers, resin containers, glass containers, metal containers, etc. Can be mentioned.
The above-described embodiment is an exemplification, and the liquid filling apparatus of the present invention is not limited to this embodiment.

Next, the present invention will be described in more detail by showing specific examples.
[Example 1]
Stainless steel (SUS316L, 68 mm × 68 mm, thickness 200 μm) was prepared as a base material for the unit porous plate.
After laminating a photosensitive dry film (manufactured by Asahi Kasei E-materials Co., Ltd. SUNFORT) on both main surfaces of this base material, exposure is performed through a desired mask, and development is performed on both surfaces of the base material. Formed. As shown in FIG. 1, the thus formed etching mask has regular hexagonal openings with an opening diameter of 850 μm arranged at a pitch of 1050 μm, and the openings of the etching masks on the front and back sides coincide with each other. It was a thing.

Next, the substrate was etched from both sides by spray etching under the following etching conditions to form through holes, and then the etching mask was removed and washed.
(Etching conditions)
・ Etching solution: Ferric chloride solution ・ Specific gravity: 45 Baume (Be)
・ Temperature: 55 ℃
・ Spray pressure: 0.3 MPa

By such spray etching, a unit porous plate having a plurality of through-holes having a regular hexagonal opening shape was obtained.
Next, the three unit porous plates were sintered and joined (sintering temperature 1250 ° C., sintering time 4 hours) to produce a porous plate (untreated sample) (see FIG. 8). The surface roughness (Ra) of both surfaces of this porous plate (untreated sample) was measured, and the results are shown in Table 1 below. In addition, the surface roughness (Ra) was measured using Ryoka System Co., Ltd. Vert Scan2.0.
In addition, the through hole of this perforated plate (untreated sample) is observed using a transmission type three-dimensional measuring instrument, and half of the difference between the maximum value and the minimum value of the inner diameter in the depth direction is calculated as the variation amount B. The ratio B / T between the variation amount B and the substrate thickness T (200 μm) was calculated, and the results are shown in Table 1 below.

  Next, the porous plate (untreated sample) was immersed in a ferric chloride solution at a liquid temperature of 45 ° C. and subjected to a roughening treatment to produce porous plates (sample A to sample D) of the present invention (FIG. 4). reference). The samples A to D were adjusted in the degree of roughening by adjusting the immersion time in the ferric chloride solution. The surface roughness (Ra) of both surfaces of such a perforated plate (Sample A to Sample D) was measured in the same manner as described above, and the results are shown in Table 1 below. Further, with respect to the through holes of the perforated plates (sample A to sample D), the variation amount B and the ratio B / T were calculated in the same manner as above, and the results are shown in Table 1 below.

Next, using the above-mentioned perforated plates (sample A to sample D, untreated sample) as three meshes, the combinations shown in Table 2 below, and the liquid filling apparatus as shown in FIGS. The cylindrical discharge part of the liquid filling nozzle was mounted in multiple stages (sample 1 to sample 13) via an annular spacer. The annular spacer used had a square opening of 64 mm × 64 mm in the center of stainless steel (SUS304) having the same outer shape and dimensions as the porous plate. Thus, the aperture ratio of the perforated plate attached to the liquid filling apparatus (percentage of the total aperture area of the through holes in the effective liquid ejection surface) was about 63%.
Moreover, a stainless steel wire mesh (number of meshes: 24) was prepared, and the wire mesh was similarly attached (sample 14) as three meshes instead of the perforated plate.

  Next, in each liquid filling device in which three meshes are the above combination, pure water with a liquid temperature of 80 ° C. is used as the liquid, and an operation of discharging 1000 ml of liquid from the liquid filling nozzle in 1 second is performed at intervals of 3 seconds Repeatedly, each item of liquid cutting property, transparency, and durability was evaluated.

<Liquidity>
The presence or absence of liquid drop from the liquid filling nozzle after the liquid discharge was stopped was observed, and the liquid breakage was evaluated according to the following criteria.
○: No drop of liquid is observed
×: Liquid falling is seen and liquid running out is bad

<Transparency>
The transparency of the liquid discharged from the liquid filling nozzle was evaluated according to the following criteria. The better the transparency, the smaller the amount of bubbles mixed in the liquid, and the bubbling of the liquid surface when the container is filled is prevented.
○: The liquid is not cloudy and has good transparency
Δ: The liquid is slightly cloudy but the transparency is almost good
×: The liquid is cloudy and has poor transparency

<Durability>
After the liquid was discharged from the liquid filling nozzle under the above conditions for 72 hours, the deformation amount of the mesh was observed, and the durability was evaluated according to the following criteria.
○: Deformation is not seen in the three meshes
△: One mesh is deformed, but two meshes are deformed
No problem in practical use
X: Deformation is seen in 3 meshes

As shown in Table 2, the effects of the present invention are exhibited in the liquid filling devices of Sample 1 to Sample 8, and are sufficiently at a practical level.
However, in the liquid filling device of Sample 9 to Sample 13 in which the mesh located on the most downstream side of the cylindrical discharge portion is a porous plate of an untreated sample and the liquid filling device of Sample 14 in which the mesh is all a metal mesh, It was confirmed that the effects of the invention were not achieved.

[Example 2]
Table 3 below shows three meshes mounted on the cylindrical discharge portion of the liquid filling nozzle constituting the liquid filling apparatus using the perforated plate (sample C, untreated sample) prepared in Example 1 and a wire mesh. In the same manner as in Example 1, the operation of discharging 1000 ml of liquid from the liquid filling nozzle in 1 second is performed for 3 seconds, except that the combination shown in FIG. Repeatedly at intervals, each item of liquid breakability, transparency, and durability was evaluated.

As shown in Table 3, the liquid filling devices of Sample 15, Sample 17 to Sample 19, and Sample 21 have the effects of the present invention and are sufficiently at a practical level.
However, even if the most downstream mesh is a wire mesh, the liquid filling device of the sample 20 that does not use the porous plate of the sample C, and the samples 16 and 22 that do not use the porous plate of the sample C It was confirmed that the effect of the present invention was not achieved in the liquid filling apparatus.

  The present invention can be used in various fields having a liquid filling process into a container.

DESCRIPTION OF SYMBOLS 11 ... Perforated plate 11 '... Unit porous plate 12 ... Base material 13 ... Through-hole 13a, 13b ... Opening part of through-hole 14 ... Inner wall 21 ... Mesh 51 ... Filling device 53 ... Fixed quantity storage tank 54 ... Connection piping 55 ... Liquid filling nozzle 56 ... Cylindrical body 57 ... Cylindrical discharge part

Claims (6)

In the perforated plate that is provided near the discharge port of the liquid filling nozzle and suppresses the drop of the liquid when filling stops,
A metal substrate having one surface and the other surface opposite thereto, and a plurality of etching holes penetrating from the one surface of the metal substrate to the other surface,
Surface roughness of the substrate (Ra) is not less 0.1μm or more,
Wherein the ratio between the thickness T of the substrate when the half of the difference between the maximum value and the minimum value of the inner diameter in the depth direction of the through hole and B (B / T) is 0.15 or less A perforated plate for a liquid filling nozzle. 2. The perforated plate for a liquid filling nozzle according to claim 1, wherein an opening diameter of the etching through hole on the surface of the substrate is in a range of 400 to 2400 μm. The thickness of the said porous plate is the range of 100-1000 micrometers, The porous plate for liquid filling nozzles of Claim 1 or Claim 2 characterized by the above-mentioned. The perforated plate for a liquid-filled nozzle according to any one of claims 1 to 3, wherein the aperture ratio of the perforated plate is in the range of 40 to 80%. A fixed amount storage tank, a liquid filling nozzle, and a connection pipe connecting the fixed amount storage tank and the liquid filling nozzle;
The liquid filling nozzle has a cylindrical main body connected to the connection pipe, and a cylindrical discharge portion located on the downstream side of the cylindrical main body,
A plurality of meshes are attached to the cylindrical discharge part in multiple stages via an annular spacer,
5. The liquid filling apparatus according to claim 1, wherein at least the mesh located on the most downstream side of the cylindrical discharge portion is a porous plate for a liquid filling nozzle according to claim 1. A fixed amount storage tank, a liquid filling nozzle, and a connection pipe connecting the fixed amount storage tank and the liquid filling nozzle;
The liquid filling nozzle has a cylindrical main body connected to the connection pipe, and a cylindrical discharge portion located on the downstream side of the cylindrical main body,
A plurality of meshes are attached to the cylindrical discharge part in multiple stages via an annular spacer,
The said mesh located in the most upstream and / or middle of the said cylindrical discharge part is a perforated plate for liquid filling nozzles in any one of Claims 1 thru | or 4, The liquid filling apparatus, wherein the mesh located on the most downstream side is a wire mesh.

Images