JP5867557B2 - Liquid container - Google Patents

Description

  The present invention relates to a technique for supplying a liquid from a liquid container to a liquid consuming device.

  Conventionally, as a method of supplying ink from an ink cartridge to a printer, ink is formed by pressing a foam (negative pressure generating member) provided at an ink supply port of an ink cartridge against a filter provided at an ink introduction port on the printer side. There is a method of supplying (see, for example, Patent Document 1).

  However, in such an ink supply method, depending on the contact state between the filter and the negative pressure generating member and the ink suction force of the printer, the surrounding air may enter the boundary portion between the filter and the negative pressure generating member, causing pressure loss. May increase and the ink flow may be obstructed. Such a problem is not limited to printers and ink cartridges, but is a problem common to liquid consuming devices other than printers and liquid containers that supply liquid to the liquid consuming devices.

JP 2005-205893 A

  Based on the above-described problems, the problem to be solved by the present invention is that air enters the contact portion between the filter provided at the liquid inlet on the liquid consuming device side and the negative pressure generating member on the liquid container side. It is to provide a technology capable of suppressing the above.

The present invention can be realized as the following forms or application examples in order to solve at least a part of the above-described problems.
The first aspect of the present invention is:
A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
A part of the side surface of the foam is exposed to the outside of the liquid supply port,
This is a liquid container.
The second aspect of the present invention is:
A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
An atmospheric communication path provided between the liquid supply port and the outer wall of the wall;
In a state where the liquid container is attached to the liquid consumption device, the atmosphere communication path communicates with the closed space.
This is a liquid container.
The third aspect of the present invention is:
A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
The pressure resistance of the meniscus formed by the liquid on the foam is smaller than the pressure resistance of the meniscus formed by the liquid on the filter, and the area of the exposed surface of the foam is smaller than the area of the filter.
This is a liquid container.
(1) According to another aspect of the present invention, there is provided a liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter. The liquid container includes an internal chamber capable of storing the liquid; a liquid supply port provided in a wall of the internal chamber; a foam provided in the liquid supply port; and the wall surrounding the liquid supply port And the foam is disposed so as to be in contact with the filter when the liquid container is mounted on the liquid consuming device, and the outer wall is the wall of the liquid container And the liquid consuming device are configured to form a closed space, and the liquid supply port is configured to be disposed in the closed space. In a state where the liquid container is mounted on the liquid consuming device, the foam is disposed so as to be in contact with the filter. In this state, the liquid may evaporate from the foam or filter. However, in the above-described liquid container, the outer wall is configured so as to form a closed space between the liquid container and the liquid consuming device, and the liquid supply port is disposed in the closed space, thereby suppressing the progress of evaporation. can do.
(2) In the liquid container of the above aspect, a part of the side surface of the foam may be exposed to the outside of the liquid supply port. In the case of such a liquid container, since the density of the foam increases when the foam is pressed against the filter, the pressure resistance of the meniscus formed by the liquid on the foam can be increased. As a result, the intrusion of air into the foam can be suppressed.
(3) In the liquid container of the above aspect, in the state in which the liquid container includes an air communication path provided between the liquid supply port and the outer wall, and the liquid container is mounted on the liquid consuming device. The atmosphere communication path may communicate with the closed space. In the case of such a liquid container, the pressure in the closed space can be maintained at, for example, atmospheric pressure by the atmospheric communication passage, so that the air in the closed space expands due to the suction of the liquid by the liquid ejecting device, for example. Can be suppressed.
(4) In the liquid container of the above aspect, the atmosphere communication path may have a meandering shape. If it is a liquid container of such a form, evaporation of the liquid from closed space can be suppressed more.
(5) In the liquid container of the above aspect, the pressure resistance of the meniscus formed by the liquid on the foam is smaller than the pressure resistance of the meniscus formed by the liquid on the filter, and the area of the exposed surface of the foam is larger than the area of the filter. It may be small. In the case of such a liquid container, since the area of the filter is larger than the area of the exposed surface of the foam, it is possible to prevent air from entering the contact portion between the filter and the foam.

Application Example 1 A liquid consuming device in which a liquid container is mounted, and a negative pressure generating member provided in a liquid supply port of the liquid container when the liquid container is mounted in the liquid consuming device A liquid inlet having a porous filter that is in contact with the exposed surface of the negative pressure generating member and having a larger area than the exposed surface of the negative pressure generating member, and a liquid is sucked from the liquid container through the filter provided in the liquid inlet. A liquid consuming device that sucks the liquid within a pressure that a meniscus formed on the filter can withstand due to surface tension of the liquid.

  In the liquid consuming apparatus having such a configuration, the filter that contacts the exposed surface of the negative pressure generating member provided in the liquid container has a larger area than the exposed surface of the negative pressure generating member. Therefore, it can suppress that the negative pressure generation member of a liquid storage container contacts air directly. In general, the pressure that the meniscus formed on the filter can withstand is significantly higher than the pressure that the meniscus formed on the negative pressure generating member can withstand. Therefore, if the negative pressure generating member is prevented from coming into contact with the air by the above-described configuration, the negative pressure generating member from the negative pressure generating member side where the meniscus pressure resistance is small, as well as from the filter side where the meniscus pressure resistance is large. Intrusion of air into the contact portion between the filter and the filter can be suppressed. As a result, it is possible to suppress an increase in pressure loss at the boundary portion between the filter and the negative pressure generating member. Moreover, in the said structure, since the filter side is contacting the air, as long as the meniscus formed on a filter can endure, it becomes possible to attract | suck a liquid with bigger suction pressure. Therefore, even when a large amount of liquid is sucked at a time, the liquid can be smoothly supplied from the liquid container to the liquid consuming device.

[Application Example 2] The liquid consuming device according to Application Example 1, wherein the liquid introduction port is a part of a casing of the liquid container when the liquid container is mounted on the liquid consumer. And a part of the casing of the liquid consuming device, a liquid consuming device provided in an enclosed space formed by close contact, and having an air communication path communicating the closed space and the atmosphere.

  With such a configuration, the atmosphere can be introduced from the atmosphere communication path even when the liquid introduction port is disposed in the closed space, so that the inside of the closed space becomes negative due to the suction of ink. Thus, the expansion of air can be suppressed. Therefore, it is possible to suppress the inflated air from entering between the negative pressure generating member and the filter.

Application Example 3 The liquid consumption device according to Application Example 2, wherein the atmosphere communication path is a thin tube or a meandering tube. With such a configuration, evaporation of the liquid from the closed space can be suppressed.

Application Example 4 A liquid storage container mounted on the liquid consuming apparatus according to Application Example 1, including a liquid storage unit that stores the liquid and the negative pressure generating member, and through the negative pressure generating member A liquid storage container comprising: a liquid supply port that supplies the liquid stored in the liquid storage unit to the liquid consuming device. The present invention is also applicable as such a liquid container.

Application Example 5 The liquid container according to Application Example 4, wherein the liquid supply port is a part of the casing of the liquid container when the liquid container is attached to the liquid consuming device. And a part of the housing of the liquid consuming device, a liquid storage container including an air communication path disposed in a closed space formed in close contact with each other and communicating the closed space with the atmosphere. Even with such a configuration, it is possible to obtain the same effect as in Application Example 2.

Application Example 6 The liquid container according to Application Example 5, wherein the atmosphere communication path is a thin tube or a meandering tube. Even with such a configuration, it is possible to obtain the same effect as in Application Example 3.

  In addition to the configuration as the liquid container and the liquid consuming device described above, the present invention can be configured as, for example, a method for using and manufacturing a liquid container, a method for controlling the liquid consuming device, and the like.

It is explanatory drawing which shows schematic structure of the inkjet printer as an Example of this invention. FIG. 3 is an explanatory diagram illustrating a connection state between an ink cartridge and a print head and a cross-sectional structure thereof. FIG. 6 is an explanatory diagram illustrating a connection state between an ink cartridge and a print head as a comparative example. It is the figure which looked at the contact part of the filter and foam in a comparative example from the AA direction in FIG. It is a figure which shows the example which provided the atmosphere communication pipe | tube in the ink cartridge.

Hereinafter, embodiments of the present invention will be described based on examples.
FIG. 1 is an explanatory diagram showing a schematic configuration of an ink jet printer 10 as an embodiment of the present invention. An ink jet printer 10 as a liquid consuming device includes a carriage 20 on which an ink cartridge 50 containing ink such as cyan, magenta, and yellow is mounted, a carriage motor 25 that drives the carriage 20 in the main scanning direction, and a printing paper PA. A paper feed motor 30 that transports the ink in the sub-scanning direction, a print head 70 that is mounted on the carriage 20 and discharges ink supplied from the ink cartridge 50, and a suction pump 38 that is used when cleaning the print head 70. And a control unit 40 that controls the overall operation of the ink jet printer 10.

  The control unit 40 controls the carriage motor 25, the paper feed motor 30, and the print head 70 to perform printing based on print data received from a computer 90 or the like connected via a predetermined interface 85. An operation unit 80 is connected to the control unit 40 and receives various operations from the user.

  The ink jet printer 10 of this embodiment has a function of cleaning the print head 70. Specifically, when the control unit 40 receives an instruction for cleaning the print head 70 from the user through the computer 90 or the operation unit 80, the control unit 40 drives the carriage motor 25 to place the ink cartridge 50 at the place where the suction pump 38 is installed. Move. Then, the ink cartridge 50 is connected to the suction pump 38 and the suction pump 38 is driven to forcibly suck ink from the ink cartridge 50 through the print head 70. By doing so, the ink jet printer 10 can eliminate ink clogging in the print head 70.

  FIG. 2 is an explanatory diagram showing a connection state of the ink cartridge 50 and the print head 70 and a sectional structure thereof. The interior of the ink cartridge 50 is partitioned into an ink chamber 52 and a foam chamber 53 by a partition plate 51 provided in the vertical direction. Both the ink chamber 52 and the foam chamber 53 contain ink. An ink communication port 55 is provided at the lowermost part of the partition plate 51, and ink can flow between the ink chamber 52 and the foam chamber 53 through the ink communication port 55. A foam 56 as a negative pressure generating member formed of polyethylene or the like is disposed in the foam chamber 53. An ink supply port 57 that communicates with the foam chamber 53 is provided in the lower portion of the foam chamber 53. A foam 58 is held inside the ink supply port 57, and ink is supplied to the print head 70 of the inkjet printer 10 through the lower surface (exposed surface) of the foam 58.

  The print head 70 includes an ink introduction port 71 for introducing ink from the ink supply port 57 of the ink cartridge 50. On the upper surface of the ink introduction port 71, a porous metal filter 72 that partially contacts the foam 58 provided in the ink supply port 57 is provided. As the filter 72, for example, a stainless mesh or a stainless nonwoven fabric can be used. In this embodiment, the surface area of the filter 72 (including the portion where the holes are formed) is larger than the area of the exposed surface of the foam 58 held in the ink supply port 57.

  The ink introduction port 71 communicates with a cavity 74 provided with a piezo element 73 as a liquid suction unit, and a nozzle 75 is provided below the cavity 74. When the piezo element 73 is driven by the control unit 40, the ink stored in the cavity 74 is ejected onto the printing paper PA through the nozzle 75. When ink is ejected from the cavity 74, the pressure in the cavity 74 becomes negative pressure, so that the ink flows from the foam 58 provided in the ink supply port 57 of the ink cartridge 50 through the ink introduction port 71 and the filter 72. Sucked. The ink suction pressure is set to a pressure within a pressure that can be withstood by the meniscus 76 formed on the inner surface of the filter 72 by the surface tension of the ink (pressure that does not break). Specifically, for example, if the pressure that the meniscus 76 can withstand is −25 KPa, the suction pressure of ink by the print head 70 and the suction pressure of the suction pump 38 that is driven when the print head 70 is cleaned are − Set within 25 KPa. If the lower end side surface of the foam 58 is exposed to the atmosphere, and the surface tension of the meniscus 78 in the exposed portion is smaller than the surface tension of the meniscus 76 on the inner surface of the filter 72, the foam 58 is applied to the filter 72. By pressing strongly to increase the density of the foam 58, it is possible to increase the pressure resistance of the meniscus formed on the foam 58.

  An outer wall 59 is provided around the ink supply port 57 of the ink cartridge 50 so as to surround the ink supply port 57. A seal rubber 60 is provided at the lower end of the outer wall 59. The outer wall 59 and the seal rubber 60 are provided to properly maintain the contact state between the ink supply port 57 of the ink cartridge 50 and the ink introduction port 71 of the print head 70 when the ink cartridge 50 is mounted on the carriage 20. It has been. When the ink cartridge 50 is mounted on the carriage 20, the ink supply port 57 and the ink introduction port 71 are disposed in a closed space 63 formed by the outer wall 59 and the seal rubber 60. The closed space 63 communicates with the outside atmosphere through an atmosphere communication pipe 77 provided in the print head 70. The air communication pipe 77 is formed in a meandering narrow tube shape in order to suppress ink evaporation from the ink supply port 57 and the ink introduction port 71 in the closed space 63.

  As described above, in the ink jet printer 10 of the present embodiment, the ink of the ink cartridge 50 is applied to the filter 72 provided in the ink introduction port 71 of the print head 70 in a state where the ink cartridge 50 is mounted on the carriage 20. Ink is supplied from the ink cartridge 50 to the inkjet printer 10 by the foam 58 in the supply port 57 coming into contact.

  Here, a comparative example of the present embodiment will be described with reference to FIGS. FIG. 3 is an explanatory diagram illustrating a connection state between an ink cartridge 50b and a print head 70b as a comparative example of the present embodiment. FIG. 4 is a view of the contact portion between the filter 72b and the foam 58b as seen from the AA direction in FIG. In the comparative examples shown in these drawings, the form 58b provided in the ink supply port 57b of the ink cartridge 50b has a larger area than the filter 72b on the ink introduction port 71b provided in the print head 70b. Further, the contact portion between the form 58 b and the ink introduction port 71 b is disposed in a sealed space 63 b formed by the ink supply port 57 b and a seal rubber 60 b provided on the surface of the print head 70. In this configuration, when ink is sucked by the print head 70b, ink is supplied from the ink cartridge 50 through the filter 72b and the foam 58b as in the embodiment. In this comparative example, the ink of the print head 70b is supplied. Depending on the suction pressure, the pressure in the sealed space 63b decreases, the air in the sealed space 63b expands, and the air enters the contact portion between the filter 72b and the foam 58b from the foam 58b side where the pressure resistance of the meniscus is small. There is a case. Then, as shown in FIGS. 4A, 4B, and 4C, the contact area (hatched portion) between the foam 58b and the filter 72b gradually decreases, and the pressure loss increases.

  However, in this embodiment, as shown in FIG. 2, the exposed surface of the form 58 is changed to air by making the area of the filter 72 on the print head 70 side larger than the surface area of the form 58 on the ink cartridge 50 side. Suppressing contact. In general, the pressure resistance of the meniscus formed on the filter 72 has a property that it is significantly higher than the pressure resistance of the meniscus formed on the foam 58. Therefore, if the foam 58 is prevented from coming into contact with air as in the present embodiment, the foam 58 and the filter 72 are not only from the filter 72 side where the meniscus pressure resistance is high but also from the foam 58 side where the meniscus pressure resistance is low. Air can be prevented from entering the contact portion. As a result, it is possible to suppress an increase in pressure loss at the boundary portion between the filter 72 and the foam 58. Further, if the increase in pressure loss at the boundary portion is suppressed, it is possible to suppress air bubbles from being drawn from the nozzle 75 side during printing. Further, in this embodiment, since the meniscus having a high pressure resistance is in contact with air, the ink can be sucked with a larger suction pressure as long as the meniscus 76 formed on the filter 72 can withstand. Become. Therefore, it is possible to smoothly flow ink from the ink cartridge 50 to the inkjet printer 10 not only at the time of printing but also when the ink is strongly sucked at the time of ink cleaning or the like. In the present embodiment, as described above, since the form 58 is smaller than the filter 72, it is possible to suppress the occurrence of ink dripping from the form 58 to the outside of the filter 72 as the ink is sucked. Can do.

  Furthermore, in the present embodiment, the pressure in the closed space 63 can be maintained at atmospheric pressure by the atmospheric communication pipe 77, so that the air in the closed space 63 may expand due to ink suction as in the comparative example. It is suppressed. Therefore, it is possible to further suppress the air from entering the contact portion between the filter 72 and the foam 58. Further, even if the air in the closed space 63 expands, as described above, in the present embodiment, the area of the filter 72 is larger than the area of the exposed surface of the foam 58. Intrusion of air into the contact portion is suppressed. Therefore, even if the atmosphere communication pipe 77 is omitted from the configuration of the present embodiment, a certain effect can be obtained.

  Further, in this embodiment, the ink suction force by the print head 70 and the suction pump 38 is limited to a pressure within a pressure at which the meniscus formed on the filter 72 is not destroyed, so that air flows from the filter 72 into the ink inlet 71. Inflow can be suppressed. Therefore, the ink can be smoothly supplied from the ink cartridge 50 to the inkjet printer 10 through the contact portion between the foam 58 and the filter 72.

  Furthermore, in this embodiment, since the atmosphere communication pipe 77 connecting the closed space 63 and the outside is formed by a meandering thin tube, ink is passed from the filter 72 and the foam 58 in the closed space 63 when the inkjet printer 10 is stopped. Evaporation can be suppressed. As long as ink evaporation can be suppressed, the atmosphere communication pipe 77 may be meandering or may be formed only by a narrow pipe.

  As mentioned above, although one Example of this invention was described, this invention is not limited to such an Example, A various structure can be taken in the range which does not deviate from the meaning. For example, as shown in FIG. 5, the atmosphere communication pipe 77c may be provided not on the print head 70c but on the ink cartridge 50c side. By so doing, it is also possible to suppress ink evaporation from within the closed space 63. In addition, in the above-described embodiment, the ink is ejected from the nozzle 75 by the piezo element 73, but the ink may be ejected by heating the ink with a heater provided in the vicinity of the nozzle 75.

  In the above embodiment, the example in which the present invention is applied to an ink cartridge and an ink jet printer has been described. However, the present invention may be applied to a liquid consuming apparatus that ejects or discharges liquid other than ink. In addition, the present invention is also applicable to a liquid container that contains such a liquid. Further, the liquid container of the present invention can be used for various liquid consuming devices including a liquid ejecting head that discharges a minute amount of liquid droplets. “Droplet” refers to the state of the liquid ejected from the liquid consuming apparatus, and includes those that have a tail in the form of particles, tears, or threads. In addition, the “liquid” referred to here may be a material that can be ejected by the liquid consuming device. For example, it may be in the state when the substance is in a liquid phase, and may be in a liquid state with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts) ) And a liquid as one state of the substance, as well as particles in which functional material particles made of solid materials such as pigments and metal particles are dissolved, dispersed or mixed in a solvent. Further, typical examples of the liquid include ink as described in the above embodiment, liquid crystal, and the like. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot-melt inks. Specific examples of the liquid consuming device include, for example, a liquid containing dispersed or dissolved materials such as an electrode material and a color material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface emitting display, and a color filter. It may be a liquid consuming device for injecting a liquid, a liquid consuming device for injecting a bio-organic material used for biochip manufacturing, or a liquid consuming device for injecting a liquid as a sample used as a precision pipette. In addition, transparent resin liquids such as UV curable resin to form liquid consumption devices that pinpoint lubricant oil to precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid consuming device that jets a liquid onto the substrate, or a liquid consuming device that jets an etching solution such as acid or alkali to etch the substrate or the like may be employed.

DESCRIPTION OF SYMBOLS 10 ... Inkjet printer 20 ... Carriage 25 ... Carriage motor 30 ... Paper feed motor 38 ... Suction pump 40 ... Control unit 50, 50b, 50c ... Ink cartridge 51 ... Partition plate 52 ... Ink chamber 53 ... Foam chamber 55 ... Ink communication port 56 ... Form 57, 57b ... Ink supply port 58, 58b ... Form 59 ... Outer wall 60,60b ... Seal rubber 63,63b ... Closed space 70,70b, 70c ... Print head 71,71b ... Ink inlet 72,72b ... Filter 73 ... Piezo element 74 ... cavity 75 ... nozzle 76, 78 ... meniscus 77, 77b ... atmospheric communication pipe 80 ... operation unit 85 ... interface 90 ... computer

Claims (6)

A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
A part of the side surface of the foam is exposed to the outside of the liquid supply port,
A liquid container characterized by that. A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
An atmospheric communication path provided between the liquid supply port and the outer wall of the wall;
In a state where the liquid container is attached to the liquid consumption device, the atmosphere communication path communicates with the closed space.
A liquid container characterized by that. The liquid container according to claim 1 ,
An atmospheric communication path provided between the liquid supply port and the outer wall of the wall;
In a state where the liquid container is attached to the liquid consumption device, the atmosphere communication path communicates with the closed space.
A liquid container characterized by that. The liquid container according to claim 2 or 3,
The atmosphere communication path has a meandering shape,
A liquid container characterized by that. A liquid storage container capable of supplying a liquid to a liquid consuming apparatus having a liquid inlet provided with a filter,
An internal chamber capable of containing the liquid;
A liquid supply port provided in the wall of the internal chamber;
A foam provided at the liquid supply port;
An outer wall provided on the wall so as to surround the liquid supply port,
In a state where the liquid container is attached to the liquid consumption device,
The foam is arranged to be in contact with the filter;
The outer wall is configured to form a closed space between the wall of the liquid container and the liquid consuming device;
The liquid supply port is configured to be disposed in the closed space;
The pressure resistance of the meniscus formed by the liquid on the foam is smaller than the pressure resistance of the meniscus formed by the liquid on the filter, and the area of the exposed surface of the foam is smaller than the area of the filter.
A liquid container characterized by that. In the liquid container according to any one of claims 1 to 4,
The pressure resistance of the meniscus formed by the liquid on the foam is smaller than the pressure resistance of the meniscus formed by the liquid on the filter, and the area of the exposed surface of the foam is smaller than the area of the filter.
A liquid container characterized by that.

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