JP6303637B2 - 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. The liquid filling nozzle is equipped with a mesh in order to prevent the liquid from falling into the container after the container is filled with a fixed amount of liquid and the liquid filling is stopped. Usually, a plurality of meshes are attached to the discharge port of the liquid filling nozzle so as to be multistage along the flow direction of the liquid. 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 mounted on a liquid filling nozzle in a state where a plurality of such porous plates are stacked 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 has the following problems because the liquid is linearly filled into the container from the discharge port. For example, when a straight bottomed cylindrical container such as a milk paper container is filled with liquid, the linearly filled liquid flow reaches the bottom of the container with little contact with the inner wall of the container. To do. For this reason, it is likely to bounce off at the bottom of the container, thereby causing a problem that the liquid level of the liquid filled in the container is foamed and the container cannot be sealed immediately and the efficiency of the liquid filling process is poor. there were. In addition, when there are many bubbles on the liquid level, there is a problem that the liquid spills from the container and causes dirt.
The present invention has been made in view of the above situation, and includes a porous plate capable of suppressing foaming of a liquid surface when filling a container with a liquid from a liquid filling nozzle, and filling the container with liquid. 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 filling nozzle in suppressing perforated plate from falling liquid during filling stops, one surface and and a substrate having a second surface which faces, formed by forming the hole forming region of the substrate, and a plurality of through-holes penetrating from the one surface to the other surface, said plurality of Among the through holes, at least the through hole located near the periphery of the hole forming region is a distance L1 from the center of the opening on the one surface side on the liquid inlet side to the periphery of the hole forming region, It was set as the structure which has the relationship of L1> L2 between the distance L2 from the center of opening of the said other surface side which is a liquid exit side to the periphery of the said hole formation region.

As another aspect of the present invention, the through hole having a relationship of L1> L2 is configured such that the opening diameter on the liquid outlet side is larger than the opening diameter on the liquid inlet side.
As another aspect of the present invention, the porous plate has a thickness in the range of 100 to 1000 μm.
As another aspect of the present invention, the aperture ratio of the porous plate is in the range of 40 to 80%.
As another aspect of the present invention, the base material is formed by joining a first base material positioned on the one surface side and a second base material positioned on the other surface side in a thickness direction. The first substrate has a first surface located on the one surface side and a second surface opposite to the first surface, and is formed in a hole forming region of the first substrate. A plurality of first through holes penetrating from the first surface to the second surface, and the second base material has a first surface located on the other surface side and a second surface facing the first surface, and the second surface It has a plurality of second through holes formed in the hole forming region of the base material and penetrates from the second surface to the first surface, and each of the plurality of first through holes is the liquid inlet A through hole in which the center of the opening on the first surface side of the first base material that is the side and the center of the opening on the second surface side of the first base material coincide with each other, Among the plurality of second through holes, at least the second through hole located near the periphery of the hole forming region is the center of the opening on the first surface side of the second base material that is the liquid outlet side. Is a through hole located closer to the periphery of the hole forming region than the center of the opening on the second surface side of the second base material, and the base material is the second of the first base material. A configuration in which the first base material and the second base material are joined so that the center of the opening on the surface side coincides with the center of the opening on the second surface side of the second base material. did.

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. And a cylindrical discharge portion located downstream of the cylindrical main body, and at least one mesh is attached to the cylindrical discharge portion, and at least one of the meshes is the above-mentioned It was set as the structure which is a perforated plate for any one of these liquid filling nozzles.
As another aspect of the present invention, a plurality of meshes are attached to the cylindrical discharge part in multiple stages via an annular spacer, and the mesh located on the most downstream side of the cylindrical discharge part is any of the above-described ones. It was set as the structure which is a perforated plate for liquid filling nozzles.

By using the porous plate of the present invention for a liquid filling nozzle, it is possible to suppress foaming of the liquid surface when the container is filled with liquid.
The liquid filling apparatus of the present invention can perform liquid filling into a container with high efficiency.

FIG. 1 is a plan view showing an embodiment of a porous plate for a liquid-filled nozzle according to the present invention. FIG. 2 is an enlarged partial sectional view taken along line II of the perforated plate shown in FIG. FIG. 3 is an enlarged partial cross-sectional view corresponding to FIG. 2 showing another embodiment of the porous plate for a liquid-filled nozzle of the present invention. FIG. 4 is an enlarged partial cross-sectional view corresponding to FIG. 2 showing another embodiment of the porous plate for a liquid-filled nozzle of the present invention. FIG. 5 is an enlarged partial cross-sectional view corresponding to FIG. 2 showing another embodiment of a porous plate for a liquid-filled nozzle of the present invention. FIG. 6 is an enlarged partial cross-sectional view corresponding to FIG. 2 showing another embodiment of the porous plate for a liquid-filled nozzle of the present invention. FIG. 7 is a schematic configuration diagram showing an embodiment of the liquid filling apparatus of the present invention. FIG. 8 is a schematic configuration diagram showing an embodiment of the liquid filling apparatus of the present invention. FIG. 9 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 plan view showing an embodiment of a porous plate for a liquid-filled nozzle according to the present invention, and FIG. 2 is an enlarged partial sectional view taken along line II of the porous plate shown in FIG. 1 and 2, the perforated plate 11 has a plurality of penetrations penetrating from one surface 12 a to the other surface 12 b in a hole forming region 13 (region surrounded by an alternate long and short dash line) set in the substrate 12. It has holes 14 and 15. The through hole 14 is located near the peripheral edge 13a of the hole forming region 13 among the plurality of through holes located in the hole forming region 13, and in the example shown in FIG. It is a through hole located. The through hole 15 is a through hole located inside the hole forming region 13 with respect to the annular region 13A where the through hole 14 is located. In the perforated plate 11, the liquid flows in the direction of arrow a shown in FIG. In FIG. 1, the description of the through holes 14 and 15 located in the hole forming region 13 is omitted.

In the through hole 14 positioned near the peripheral edge 13a of the hole forming region 13, the center C1 of the opening 14a on the liquid inlet side (the surface 12a side of the base material 12) and the liquid outlet side (the surface 12b side of the base material 12). The center C2 of the opening 14b does not coincide with the thickness direction of the substrate 12. The distance L1 from the center C1 of the opening 14a on the liquid inlet side to the peripheral edge 13a of the hole forming region 13 and the distance L2 from the center C2 of the opening 14b on the liquid outlet side to the peripheral edge 13a of the hole forming region 13 A relationship of L1> L2 is established between them. The difference between the distance L1 and the distance L2, that is, the amount of deviation between the center C1 of the opening 14a of the through hole 14 and the center C2 of the opening 14b may be appropriately set in consideration of the physical properties of the liquid to be filled. For example, it can set in the range of 10-1000 micrometers.
On the other hand, in the through hole 15, the center C1 'of the opening 15a on the liquid inlet side (surface 12a side of the base material 12) and the center C2' of the opening 15b on the liquid outlet side (surface 12b side of the base material 12) are based on the base. It corresponds in the thickness direction of the material 12.
The center C1 of the opening 14a of the through hole 14, the center C2 of the opening 14b, the center C1 'of the opening 15a of the through hole 15, and the center C2' of the opening 15b are the through holes in the surfaces 12a and 12b of the substrate 12. 14 and 15 are the center of gravity positions of the opening shapes.

The material of the substrate 12 constituting 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, It may be a chromium alloy, a molybdenum alloy, a tungsten alloy, or the like. The thickness of the base material 12 is, for example, 100 to 1000 μm, preferably 200 to 600 μm. Further, the outer shape of the base material 12 can be appropriately set according to the shape of the liquid filling nozzle used by mounting the porous plate 11, for example, a polygon, a polygon with rounded corners, a circle, It may be oval.
The hole forming region 13 in the base material 12 of the porous plate 11 is a region that acts as an effective liquid discharge surface when the porous plate 11 is mounted on the liquid filling nozzle of the liquid filling device. It can be set as appropriate according to the specifications of the liquid filling nozzle used with the porous plate 11 attached.
The shape of the opening 14a on the liquid inlet side (surface 12a side of the base material 12) of the through hole 14 constituting the perforated plate 11, the shape of the opening 14b on the liquid outlet side (surface 12b side of the base material 12), and the through hole The shape of the opening 15a on the liquid inlet side (surface 12a side of the base material 12) and the shape of the opening 15b on the liquid outlet side (surface 12b side of the base material 12) are not particularly limited, and are, for example, circular or regular hexagonal It may be a regular polygon such as, a rectangle, a trapezoid, an ellipse or the like.

  In the illustrated example, the through hole 14 positioned near the peripheral edge 13a of the hole forming region 13 has an opening diameter D2 on the liquid outlet side larger than the opening diameter D1 on the liquid inlet side. Further, the through hole 15 has an opening diameter D1 ′ on the liquid inlet side and an opening diameter D2 ′ on the liquid outlet side substantially equal. Here, the opening diameters D1 and D1 ′ on the liquid inlet side are the centers C1 and C1 of the openings 14a and 15a of the through holes 14 and 15 in the surface 12a of the base 12 when the through holes 14 and 15 have a circular shape. It is the average value of the aperture diameters passing through C1 ′. Further, when the through holes 14 and 15 have a circular opening shape, the opening diameters D2 and D2 ′ on the liquid outlet side also have the centers C2 and C2 of the openings 14b and 15b of the through holes 14 and 15 on the surface 12b of the substrate 12. It is the average value of the aperture diameters passing through ′. On the other hand, when the opening shape of the through holes 14 and 15 is an opening shape whose opening diameter is clearly different at the measurement location, such as a regular polygon or an ellipse, the opening diameter passing through the center of the opening of the through holes 14 and 15 The minimum value is the opening diameter.

The opening diameters D1 and D2 of the through holes 14 constituting the perforated plate 11 and the opening diameters D1 ′ and D2 ′ of the through holes 15 can be set in consideration of the viscosity of the liquid to be filled, the filling speed, and the like. , 400 to 2400 μm, preferably 600 to 1500 μm. Moreover, the aperture ratio in the perforated plate 11 can be appropriately set in consideration of the aperture diameter of the through holes 14 and 15, the material of the base material 12, the physical properties of the liquid to be filled, and the like, for example, in the range of 40 to 80%. , Preferably in the range of 55 to 75%. The opening ratio is expressed as a percentage of the total opening area of the through holes 14 and 15 in the hole forming region 13.
Such a through hole 14 is located in the annular region 13A (see FIG. 1) near the peripheral edge 13a of the hole forming region 13 of the perforated plate 11 as described above. In the example shown, there is one row along the peripheral edge 13a of the hole forming region 13, but it may be a plurality of rows, and is set appropriately in consideration of the width of the annular region 13A, the opening diameter of the through hole 14, the physical properties of the liquid, and the like. can do. The annular region 13A in which the through hole 14 is located has physical properties of the liquid to be filled, a deviation amount between the center C1 of the opening 14a of the through hole 14 and the center C2 of the opening 14b (difference between the distance L1 and the distance L2), and the porous plate 11 For example, a band-shaped range set with a width in the range of 0.5 to 20 mm from the peripheral edge 13a of the hole forming region 13 to the inner side. . When there are a plurality of rows of through holes 14 in the annular region 13A, the amount of deviation of the through holes 14 located in the outer row (difference between the distance L1 and the distance L2) and the amount of deviation of the through holes 14 located inside (the distance) The difference between L1 and distance L2) may be the same or different.

Such a porous plate 11 of the present invention is used as a mesh for the liquid filling nozzle, and particularly when a plurality of meshes are attached to the liquid filling nozzle, it is used as a mesh located at the most downstream side, so that FIG. As shown by a chain line arrow, at the peripheral edge 13a side of the hole forming region 13, the liquid is discharged from the liquid outlet side (the surface 12b side of the substrate 12) so as to spread outward. Therefore, even if the target container to be filled with liquid is a bottomed cylindrical container whose inner wall surface is straight, the liquid flow discharged from the liquid filling nozzle is filled while contacting the inner wall surface of the container. The splash of liquid at the bottom is suppressed. Thereby, bubbling of the liquid surface during filling of the liquid into the container and spilling from the container are suppressed, and the container can be sealed immediately after the container is filled with a fixed amount of liquid.
In the perforated plate 11 of the present invention, the opening diameter D2 on the liquid outlet side of the through hole 14 is larger than the opening diameter D1 on the liquid inlet side, but as shown in FIG. The opening diameter D1 and the opening diameter D2 on the liquid outlet side may be substantially equal.

FIG. 4 is an enlarged partial cross-sectional view corresponding to FIG. 2 showing another embodiment of the porous plate for a liquid-filled nozzle of the present invention. The perforated plate 21 shown in FIG. 4 is an example having a base material 22 in which a base material 22A and a base material 22B are joined, and the base material 22 is formed in the hole forming region 23 from one surface 22a. It has a plurality of through holes 24, 25 penetrating the other surface 22b. The through hole 24 is a through hole located in the annular region 23 </ b> A near the peripheral edge 23 a of the hole forming region 23 among the plurality of through holes located in the hole forming region 23. Moreover, the through hole 25 is a through hole located inside the hole forming region 23 with respect to the annular region 23A where the through hole 24 is located. In the perforated plate 21, the liquid flows in the direction of arrow a shown in FIG.
In the through hole 24 located near the peripheral edge 23a of the hole forming region 23, the center C1 of the opening 24a on the liquid inlet side (surface 22a side of the base material 22) and the opening on the liquid outlet side (surface 22b side of the base material 22). The center C <b> 2 of 24 b does not coincide with the thickness direction of the base material 22. The distance L1 from the center C1 of the opening 24a on the liquid inlet side to the peripheral edge 23a of the hole forming region 23 and the distance L2 from the center C2 of the opening 24b on the liquid outlet side to the peripheral edge 23a of the hole forming region 23 A relationship of L1> L2 is established between them. On the other hand, in the through hole 25, the center C1 ′ of the opening 25a on the liquid inlet side (surface 22a side of the base material 22) and the center C2 ′ of the opening 25b on the liquid outlet side (surface 22b side of the base material 22) are based on the base. It corresponds in the thickness direction of the material 22.

One base material 22 </ b> A constituting the base material 22 is located on the liquid inlet side, and has a plurality of through holes 24 </ b> A and 25 </ b> A in the hole forming region 23. In the through holes 24A and 25A of the base material 22A, the center of the opening on the liquid inlet side and the center of the opening on the liquid outlet side (joining surface side with the base material 22B) coincide with each other in the thickness direction of the base material 22A. Yes. The opening diameter D1 of the through hole 24A and the opening diameter D1 ′ of the through hole 25A are substantially equal.
The other base material 22B constituting the base material 22 is located on the liquid outlet side, and has a plurality of through holes 24B and 25B in the hole forming region 23. The through hole 24B included in the base material 22B is located closer to the peripheral edge 23a of the hole forming region 23 with respect to the center of the liquid inlet side (joining surface side with the base material 22A). However, both do not match in the thickness direction of the base material 22B. In addition, the opening of the through hole 24B has an opening diameter D1 on the joint surface side with the base material 22A, an opening diameter on the liquid outlet side is D2, and the opening diameter D2 is larger than the opening diameter D1. In contrast, in the through hole 25B of the base material 22B, the center of the opening on the liquid inlet side (joining surface side with the base material 22A) and the center of the opening on the liquid outlet side are one in the thickness direction of the base material 22B. The opening diameter D2 ′ is a through hole having a size substantially equal to the opening diameter D1 ′ of the through hole 25A of the base 22A.

The material of the base material 22A and the base material 22B can be the same as the material of the base material 12 described above. In the base material 22A and the base material 22B, the center on the joining surface side of the through hole 24A of the base material 22A coincides with the center on the joining surface side of the through hole 24B of the base material 22B, and the joining of the through hole 25A of the base material 22A Positioning is performed such that the center on the surface side coincides with the center on the bonding surface side of the through hole 25B of the base material 22B, and the base material 22 is configured by being joined.
As described above, when the base material 22 is joined to the base material 22A and the base material 22B, the aspect ratio of the through holes 24 and 25 of the base material 22 (through holes in the thickness direction of the base material 22) (Length / opening diameter of through-hole) can be made large.

  Such a porous plate 21 of the present invention is used as a mesh for the liquid filling nozzle, and particularly when a plurality of meshes are attached to the liquid filling nozzle, it is used as a mesh located on the most downstream side, so that FIG. As indicated by a chain line arrow, on the peripheral edge 23a side of the hole forming region 23, the liquid is discharged from the liquid outlet side (the surface 22b side of the base material 22) so as to spread outward. Therefore, even if the target container to be filled with liquid is a bottomed cylindrical container whose inner wall surface is straight, the liquid flow discharged from the liquid filling nozzle is filled while contacting the inner wall surface of the container. Bounce of the liquid at the bottom is suppressed, which prevents bubbling of the liquid surface when filling the liquid into the container and spillage from the container, and immediately after the container is filled with a certain amount of liquid, the container is sealed It becomes possible.

In the porous plate 21 of the present invention, the opening diameter D2 on the liquid outlet side of the through hole 24 is larger than the opening diameter D1 on the liquid inlet side. However, as shown in FIG. The opening diameter D1 and the opening diameter D2 on the liquid outlet side may be substantially equal.
Further, the porous plate 21 of the present invention described above has, in one base material 22A constituting the base material 22, the center of the opening on the liquid inlet side of the through hole 24A and the liquid outlet side (joining surface side with the base material 22B). Although the center of the opening coincides with the center of the opening on the liquid inlet side of the through-hole 24A, as shown in FIG. The center of the opening on the bonding surface side) is located near the peripheral edge 23a of the hole forming region 23, and the two may not coincide with each other in the thickness direction of the base material 22A.

  In the above-described porous plate 11 of the present invention, desired etching masks are formed on both surfaces 12a and 12b of the substrate 12, and the through hole 14 and the through hole 15 are formed by wet etching or dry etching from both surfaces of the substrate 12. Can be produced. In this case, in the formation of the through hole 14, the opening diameter of the etching mask provided on the surface 12b of the substrate 12 is larger than the opening diameter of the etching mask provided on the surface 12a of the substrate 12, and Dry etching is performed by shifting the opening center of the etching mask provided on the surface 12 b toward the periphery 13 a of the hole forming region 13.

In the production of the porous plate 21 of the present invention described above, first, a desired etching mask is formed on both surfaces of the base material 22A, and the through holes 24A and 24A are formed on both surfaces of the base material 22A by wet etching or dry etching. A through hole 25A is formed. Further, desired etching masks are formed on both surfaces of the base material 22B, and the through holes 24B and the through holes 25B are formed from both surfaces of the base material 22B by wet etching or dry etching. Thereafter, the center of the through hole 24A of the base material 22A on the joint surface side coincides with the center of the base material 22B on the joint surface side of the through hole 24B, and the center of the base material 22A on the joint surface side of the through hole 25A is the base. After alignment so as to coincide with the center of the through hole 25B of the material 22B on the joining surface side, the base material 22A and the base material 22B are formed by, for example, sintering joining, diffusion joining, arc welding, resistance welding, brazing, or the like. Can be manufactured. Formation of the through hole 24B of the base material 22B can be performed in the same manner as the formation of the through hole 14 in the base material 12 described above.
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]
7 and 8 are schematic configuration diagrams showing an embodiment of the liquid filling apparatus of the present invention. 7 and 8, the liquid filling device 51 of the present invention includes a fixed amount storage tank 52, a supply pipe 53 for supplying liquid to the fixed amount storage tank 52, a liquid filling nozzle 55, and a connection for connecting 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. 9 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. 9, 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 31 are formed on the locking portion 57 a with the annular spacer 41. It is mounted in multiple stages via. The outer shape of the cylindrical discharge part 57, the opening shape of the discharge port 58, and the dimensions thereof can be set as appropriate according to the shape of the container to be filled with the liquid. It may be rectangular, circular or the like.

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 31 with the locking parts 57 a via the annular spacer 41. It works to fix in between. The container is arranged so that the mouth is located at a predetermined position below the discharge port 58 of the cylindrical discharge part 57 or the discharge port 58 of the cylindrical discharge part 57 is inserted into the mouth of the container. Liquid filling is performed in the state.
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 of the present invention, at least one mesh of a plurality of meshes mounted on the cylindrical discharge portion is the porous plate for a liquid filling nozzle of the present invention. In the example shown in FIG. 9, one of the three meshes 31 located on the most downstream side is the porous plate 11 for a liquid filling nozzle of the present invention, and the other mesh 31 is for a conventional liquid filling nozzle. It may be a perforated plate or a wire mesh. Thus, by using the mesh 31 positioned at the most downstream side of the cylindrical discharge portion 57 as the porous plate 11 for a liquid filling nozzle according to the present invention, the target container filled with the liquid is a bottomed cylinder having a straight inner wall surface. Even in the case of a liquid container, the liquid flow discharged from the liquid filling nozzle is filled while contacting the inner wall surface of the container, so that the liquid splash at the bottom of the container is suppressed, and the liquid level when filling the liquid into the container The foaming and spilling from the container are suppressed, and the container can be sealed immediately after the container is filled with a fixed amount of liquid, and the liquid can be filled into the container with high efficiency. Furthermore, the durability of the mesh 31 is high, and the interval between mesh replacements can be increased. In addition, when the liquid flow discharged from the liquid filling nozzle is filled in contact with the inner wall surface of the container and the effect of the present invention is exerted, the perforated plate for the liquid filling nozzle of the present invention in the tubular discharge portion 57 The mounting position of 11 may not be the most downstream.

However, as described above, when a wire mesh is used as the mesh 31 other than the mesh 31 located on the most downstream side, it is inferior in terms of durability compared to the case of using a perforated plate for a conventional liquid filling nozzle. Become. In FIG. 9, the through holes 14 and 15 of the porous plate 11 for a liquid filling nozzle of the present invention, which is the mesh 31, are omitted.
The number of meshes 31 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. For example, there may be one mesh 31 attached to the cylindrical discharge portion 57, and this mesh 31 may be the perforated plate for a liquid filling nozzle of the present invention.
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. 7, 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. 8, when the piston 63 located at the lowering end point in the fixed amount storage tank 52 rises, the check valve 65 is opened, and the liquid passes through the connection pipe 54 and the liquid fills the nozzle 55. 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.
In such a liquid filling apparatus of the present invention, bubbling of the liquid surface during filling of the liquid into the container and spilling from the container are suppressed, and the liquid can be filled into the container with high efficiency.
Further, the container to be filled with the liquid by the liquid filling apparatus of the present invention is not limited to a bottomed cylindrical container whose inner wall surface is a straight shape, and the shape and material of the container are not particularly limited. And various shapes of paper containers, resin containers, glass containers, metal containers, and the like.
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.
[Preparation of perforated plate (sample 1)]
Stainless steel (SUS316L, 68 mm × 68 mm, thickness 200 μm) was prepared as a substrate for the perforated plate. An area of 64 mm × 64 mm in the center of the substrate was set as a hole forming area, and an annular area (see FIG. 1) having a width of 3 mm was set inward from the periphery of the hole forming area.

  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. In the annular region of the hole forming region, the thus formed etching mask has regular hexagonal openings with an opening diameter of 750 μm arranged at a pitch of 1050 μm on the surface on the liquid inlet side of the porous plate. Large hexagonal openings having an opening diameter of 950 μm are arranged at the same pitch of 1050 μm on the surface that becomes the liquid outlet side, and the openings of the front and back etching masks are centered on the opening on the surface that becomes the liquid outlet side, It was shifted by 100 μm in the peripheral direction of the hole forming region from the center of the opening on the surface on the liquid inlet side. Further, in the region inside the annular region of the hole forming region of the formed etching mask, regular hexagonal openings having an opening diameter of 850 μm are arranged at a pitch of 1050 μm, and the centers of the openings of the etching masks on the front and back sides are arranged. It was a match.

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 this spray etching, a porous plate (sample 1) having a plurality of through-holes having a regular hexagonal opening shape was obtained.

  In the perforated plate (sample 1) manufactured as described above, the through hole formed in the annular region of the hole forming region was observed and measured using a transmission type three-dimensional measuring instrument. The opening is a regular hexagon with an opening diameter of 745 μm, the opening on the surface on the liquid outlet side is a regular hexagon with an opening diameter of 930 μm, and the center of the opening on the surface on the liquid outlet side is the surface on the surface on the liquid inlet side It was shifted by 98 μm in the peripheral direction of the hole forming region from the center of the opening. Moreover, the through-hole formed in the area | region inside the cyclic | annular area | region of a hole formation area was a regular hexagon whose opening is 855 micrometers in opening diameter, and the center of opening of front and back corresponded. Moreover, the aperture ratio (percentage of the total opening area of the through holes in the hole forming region) of this porous plate (Sample 1) was 63%.

[Preparation of perforated plate (sample 2)]
An area of 64 mm × 64 mm in the center of the base material similar to the above was set as a hole forming area, and an etching mask was formed on both surfaces of the base material. In the etching mask formed in this manner, regular hexagonal openings having an opening diameter of 850 μm are arranged at a pitch of 1050 μm, and the centers of the openings of the front and back etching masks coincide with each other. Next, spray etching was performed under the same etching conditions as the above porous plate (Sample 1) to etch the substrate from both sides to form through holes, and then the etching mask was removed and washed.
By this spray etching, a porous plate (sample 2) having a plurality of through-holes having a regular hexagonal opening shape was obtained.
The through hole formed in the hole forming region of the perforated plate thus manufactured (sample 2) was a regular hexagon having an opening diameter of 855 μm, and the centers of the openings on the front and back sides coincided with each other.

[Liquid filling]
Next, among the three meshes mounted on the cylindrical discharge portion of the liquid filling nozzle of the liquid filling apparatus as shown in FIGS. Sample 1) and the other two meshes were used as the perforated plate (sample 2).
Next, in the liquid filling apparatus equipped with the three meshes as described above, pure water having a liquid temperature of 80 ° C. is used as the liquid, 1000 ml of liquid is supplied from the liquid filling nozzle, and the bottom wall is cylindrical with a straight inner wall surface. The operation of discharging in 1 second into a container (internal shape has a cylindrical internal shape having a square cross section of 70 mm square) is repeated at intervals of 3 seconds to fill 1000 containers, and after filling in each liquid filling The liquid surface was observed for bubbling and spilling from the container. As a result, neither foaming nor spilling was observed, which was good.
In addition, liquid filling is performed in the same manner as above except that the above-described porous plate (sample 2) is used as all three meshes mounted on the cylindrical discharge portion of the liquid filling nozzle of the same liquid filling apparatus. The subsequent liquid level was observed for bubbling and spilling from the container. As a result, it was confirmed that foaming and spilling occurred at a frequency of about 30%, and the filling property was poor.

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

11, 21 ... perforated plate 12, 22, 22 A, 22 B ... base material 13, 23 ... hole forming region 14, 15, 24, 25, 24 A, 24 B, 25 A, 25 B ... through hole 31 ... mesh 51 ... filling device 53 ... Quantitative storage tank 54 ... Connection piping 55 ... Liquid filling nozzle 56 ... Cylindrical body 57 ... Cylindrical discharge part

Claims (7)

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 substrate having one surface and the other surface opposite to the substrate, and a plurality of through holes formed in the hole forming region of the substrate and penetrating from the one surface to the other surface; ,
Among the plurality of through holes, at least the through hole located near the periphery of the hole forming region is a distance from the center of the opening on the one surface side on the liquid inlet side to the periphery of the hole forming region. A porous liquid filling nozzle characterized by having a relationship of L1> L2 between L1 and a distance L2 from the center of the opening on the other surface side on the liquid outlet side to the periphery of the hole forming region. Board.   2. The perforated plate for a liquid filling nozzle according to claim 1, wherein the through hole having a relationship of L <b> 1> L <b> 2 has an opening diameter on the liquid outlet side larger than an opening diameter on the liquid inlet side.   The perforated plate for a liquid filling nozzle according to claim 1 or 2, wherein the thickness of the perforated plate is in the range of 100 to 1000 µm.   The perforated plate for a liquid filling 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%. The base material is formed by joining a first base material located on the one surface side and a second base material located on the other surface side in a thickness direction,
The first base material has a first surface located on the one surface side and a second surface facing the first surface, and is formed in a hole forming region of the first base material. A plurality of first through holes penetrating the second surface;
The second base material has a first surface located on the other surface side and a second surface facing the first surface, and is formed in a hole forming region of the second base material. A plurality of second through holes penetrating the first surface;
Each of the plurality of first through holes includes a center of an opening on the first surface side of the first base material on the liquid inlet side and a center of an opening on the second surface side of the first base material. Is a through hole that matches,
Of the plurality of second through holes, at least the second through hole located near the periphery of the hole forming region is the center of the opening on the first surface side of the second base material on the liquid outlet side. Is a through hole located closer to the periphery of the hole forming region than the center of the opening on the second surface side of the second base material,
The base material is arranged such that the center of the opening on the second surface side of the first base material and the center of the opening on the second surface side of the second base material are aligned with each other. The perforated plate for a liquid-filled nozzle according to any one of claims 1 to 4, wherein the second substrate is joined.   A fixed-quantity storage tank, a liquid filling nozzle, and a connection pipe connecting the fixed-quantity storage tank and the liquid filling nozzle, the cylindrical main body connected to the connection pipe, and the cylindrical main body A cylindrical discharge portion located on the downstream side of the at least one mesh, and at least one mesh is attached to the cylindrical discharge portion, and at least one of the meshes is any one of claims 1 to 5 A liquid filling apparatus, wherein the liquid filling nozzle is a perforated plate for liquid filling nozzles.   A plurality of meshes are attached to the cylindrical discharge part in multiple stages via an annular spacer, and the mesh located on the most downstream side of the cylindrical discharge part is any one of claims 1 to 5. The liquid filling apparatus according to claim 6, wherein the liquid filling device is a perforated plate for a liquid filling nozzle.

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