Liquid container and method for injecting liquid into the liquid container

Abstract

The present invention provides a liquid container and a method for injecting liquid into the liquid container, which can improve the reusability of the liquid container. [Solution] The liquid container comprises a storage bag for storing liquid and a supply unit attached to the storage bag. The supply unit has a liquid supply port connectable to a supply pipe of a liquid dispensing device, a liquid supply channel connecting the inside of the storage bag and the liquid supply port, a liquid inlet separate from the liquid supply port into which liquid can be injected into the inside of the storage bag, a liquid injection channel connecting the liquid inlet and the inside of the storage bag, and a valve structure in the liquid injection channel that can be opened and closed multiple times.

Description

[Technical Field]

[0001] The present invention relates to a liquid container and a method for injecting liquid into a liquid container. [Background Art]

[0002] For example, as disclosed in Patent Document 1, there is disclosed a liquid container including: a liquid storage bag that stores ink, which is an example of a liquid; and a liquid supply port for supplying the liquid stored in the liquid storage bag to a liquid ejecting apparatus. Such a liquid container is provided with a liquid injection port for injecting ink into the liquid storage bag, separately from the liquid supply port. As a method of injecting liquid into such a liquid container, after ink is injected into the liquid storage bag through the liquid injection port, the liquid injection port is closed by heat crimping or the like. [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-233947 [Brief Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, in such a liquid container, the liquid injection port is closed after the liquid is injected. For this reason, it has not been possible to re-inject liquid into the liquid container. Therefore, improvement in reusability of the liquid container is desired. [Means for Solving the Problem]

[0005] A liquid container that solves the above problems comprises a container bag for containing liquid and a supply unit attached to the container bag, wherein the supply unit has a liquid supply port connectable to a supply pipe of a liquid dispensing device, a liquid supply channel connecting the inside of the container bag and the liquid supply port, a liquid inlet separate from the liquid supply port for injecting liquid into the inside of the container bag, a liquid injection channel connecting the liquid inlet and the inside of the container bag, and a valve structure in the liquid injection channel that can be opened and closed multiple times.

[0006] A method for injecting liquid into a liquid container that solves the above problems comprises a container bag for containing liquid and a supply unit attached to the container bag, wherein the supply unit has a liquid supply port connectable to a supply pipe of a liquid discharge device, a liquid supply channel connecting the inside of the container bag and the liquid supply port, a liquid inlet separate from the liquid supply port for injecting liquid into the inside of the container bag, a liquid inlet connecting the liquid inlet and the inside of the container bag, and a valve structure that can be opened and closed multiple times in the liquid inlet channel, and includes injecting liquid from an injection pipe different from the supply pipe into the inside of the container bag when the valve structure is open, and closing the valve structure after injecting liquid from the injection pipe into the inside of the container bag. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing a liquid dispensing device of the first embodiment. [Figure 2] Figure 2 is a cross-sectional view showing a liquid container of the first embodiment. [Figure 3] Figure 3 is a cross-sectional view showing a liquid container of the second embodiment. [Figure 4] Figure 4 is a cross-sectional view showing a liquid container of the third embodiment. [Modes for carrying out the invention]

[0008] [First Embodiment] An embodiment of a liquid container and a method for injecting liquid into the liquid container will be described below with reference to the drawings.

[0009] <Configuration of liquid dispensing device 10> As shown in Figure 1, the liquid ejection device 10 is configured to perform printing by ejecting liquid onto the medium 90. The liquid ejection device 10 may also be an inkjet printer that performs printing by ejecting ink, which is an example of a liquid, onto the medium 90. The medium 90 may be, for example, paper, fabric, vinyl, plastic parts, metal parts, etc.

[0010] The liquid dispensing device 10 includes a liquid dispensing unit 11. The liquid dispensing unit 11 is configured to dispense liquid into the medium 90. The liquid dispensing unit 11 includes a liquid dispensing head 12. The liquid dispensing head 12 dispenses liquid into the medium 90. The liquid dispensing head 12 is configured to dispense liquid to be contained in a liquid container 30, which will be described later.

[0011] The liquid ejection head 12 is equipped with multiple nozzles 13. The liquid ejection head 12 performs printing by ejecting liquid onto the medium 90 from each of the multiple nozzles 13. The liquid ejection head 12 may be of serial type or line type. In the serial type, printing is performed by ejecting liquid onto the medium 90 while the liquid ejection head 12 moves. In the line type, the liquid ejection head 12 is provided in a long length in the width direction of the medium 90, and printing is performed by ejecting liquid onto the medium 90.

[0012] The liquid dispensing device 10 may include a transport unit 14. The transport unit 14 is configured to transport the medium 90. The transport unit 14 transports the medium 90 from a medium storage unit (not shown) to the liquid dispensing head 12. The transport unit 14 transports the printed medium 90 by the liquid dispensing head 12 to the outside of the liquid dispensing device 10. The transport unit 14 may include rollers.

[0013] The liquid ejection device 10 may include a mounting section 20. The mounting section 20 is capable of detachably mounting a liquid container 30. The mounting section 20 may be capable of mounting multiple liquid containers 30 corresponding to different liquid colors. The liquid container 30 contains the liquid to be supplied to the liquid ejection head 12. The liquid container 30 may be an ink cartridge.

[0014] The liquid dispensing device 10 may include supply channels 22. The liquid dispensing device 10 may include multiple supply channels 22 corresponding to the color of the liquid. The supply channels 22 are channels for supplying liquid from a liquid container 30 mounted on the mounting section 20 to a liquid dispensing head 12. The upstream end of the supply channel 22 is connected to the liquid container 30 when the liquid container 30 is mounted on the mounting section 20. The downstream end of the supply channel 22 is connected to the liquid dispensing head 12.

[0015] The liquid dispensing device 10 includes a supply pipe 23. The supply pipe 23 is located at the upstream end of the supply channel 22. The supply pipe 23 is insertable into the liquid container 30 which is mounted on the mounting section 20. The supply pipe 23 may also be a supply needle. The liquid dispensing device 10 may also include a pump (not shown) that supplies liquid from the liquid container 30 to the liquid dispensing head 12. The supply channel 22 may supply liquid by water head.

[0016] An injection tube 24 can be inserted into the liquid container 30 when it has been removed from the mounting part 20. The injection tube 24 is different from the supply tube 23. The injection tube 24 is a component for injecting liquid into the liquid container 30. By inserting the injection tube 24 into the liquid container 30, liquid can be injected into the liquid container 30 from a liquid injection container (not shown). The injection tube 24 may have the same shape as the supply tube 23.

[0017] <Composition of liquid container 30> As shown in Figure 2, the liquid container 30 comprises a supply unit 32 and a storage bag 33. The storage bag 33 contains the liquid. The storage bag 33 is made of, for example, a flexible material. The storage bag 33 is bag-shaped.

[0018] The supply unit 32 is a member for supplying the liquid contained in the storage bag 33 to the outside. The supply unit 32 is attached to the storage bag 33. Specifically, the supply unit 32 closes the opening region of the storage bag 33. The supply unit 32 is attached to the storage bag 33 by, for example, heat welding. Thereby, the storage bag 33 is sealed.

[0019] The supply unit 32 includes a liquid supply unit 51. The liquid supply unit 51 is configured to be capable of supplying liquid from the storage bag 33 to the outside. When the liquid container 30 is mounted on the mounting portion 20, the liquid supply unit 51 supplies liquid from the storage bag 33 to the liquid discharge apparatus 10.

[0020] The liquid supply unit 51 includes a liquid supply port 53 and a liquid supply flow path 54. That is, the supply unit 32 includes the liquid supply port 53 and the liquid supply flow path 54. The liquid supply port 53 communicates with the interior of the storage bag 33 via the liquid supply flow path 54.

[0021] The liquid supply port 53 is connectable to the supply pipe 23 of the liquid discharge apparatus 10. Particularly, when the liquid container 30 is mounted on the mounting portion 20, the supply pipe 23 is inserted into the liquid supply port 53. The liquid supply port 53 may be closed by a film in a state before the liquid container 30 is mounted on the mounting portion 20.

[0022] The liquid supply flow path 54 connects the interior of the storage bag 33 and the liquid supply port 53. The liquid supply flow path 54 may be provided with a check valve in an orientation that prevents liquid from leaking from the interior of the storage bag 33 via the liquid supply port 53.

[0023] The liquid supply unit 51 may include a second valve structure 55. That is, the supply unit 32 may include the second valve structure 55. The second valve structure 55 is provided in the liquid supply flow path 54. The second valve structure 55 is a valve structure that can be opened and closed multiple times in the liquid supply flow path 54. The second valve structure 55 is opened by inserting the supply pipe 23. The second valve structure 55 is closed by pulling out the supply pipe 23. A packing 74, which will be described later, may be press-fitted onto an inner wall surface 54A constituting the liquid supply flow path 54.

[0024] The second valve structure 55 may include a second spring member 72. The second valve structure 55 may be a valve structure including a second spring member 72. The second valve structure 55 closes due to the elastic force of the second spring member 72. The second valve structure 55 opens against the elastic force of the second spring member 72.

[0025] The supply unit 32 includes a liquid injection unit 61. The liquid injection unit 61 is configured to inject liquid into the storage bag 33. The liquid injection unit 61 includes a liquid inlet 63 and a liquid injection channel 64. In other words, the supply unit 32 includes a liquid inlet 63 and a liquid injection channel 64. The liquid inlet 63 is provided separately from the liquid supply port 53. The liquid inlet 63 communicates with the inside of the storage bag 33 via the liquid injection channel 64. When injecting liquid into the storage bag 33, the injection tube 24 is inserted into the liquid inlet 63. The liquid inlet 63 is configured to allow liquid to be injected into the inside of the storage bag 33 via the liquid injection channel 64. The liquid inlet 63 may be covered with a film before the liquid container 30 is attached to the mounting unit 20.

[0026] The liquid injection channel 64 connects the liquid inlet 63 to the inside of the storage bag 33. The liquid injection channel 64 may be equipped with a check valve in a direction that prevents liquid from leaking from the inside of the storage bag 33 through the liquid inlet 63.

[0027] The liquid injection section 61 may include a first valve structure 65. In other words, the supply section 32 may include a first valve structure 65. The first valve structure 65 is provided in the liquid injection passage 64. The first valve structure 65 is a valve structure that can be opened and closed multiple times in the liquid injection passage 64. The first valve structure 65 is opened by inserting the injection pipe 24. The first valve structure 65 is closed by removing the injection pipe 24.

[0028] The first valve structure 65 may include a first spring member 71. The first valve structure 65 may be a valve structure including the first spring member 71. The first valve structure 65 closes due to the elastic force of the first spring member 71. The first valve structure 65 opens against the elastic force of the first spring member 71.

[0029] More specifically, the first valve structure 65 comprises a first spring member 71, a plug 73, and a packing 74. The packing 74 is made of an elastic material such as rubber or elastomer. The packing 74 is provided at the end of the liquid injection channel 64. The packing 74 is press-fitted into the inner wall surface 64A that constitutes the liquid injection channel 64.

[0030] The plug 73 performs the opening and closing operation of the first valve structure 65. The plug 73 is provided in the liquid injection channel 64. The plug 73 is provided in the liquid injection channel 64 inside the packing 74. One end 73A of the plug 73 is in contact with the packing 74. The other end 73B of the plug 73 is inserted into the first spring member 71. The plug 73 is slidable along the liquid injection channel 64.

[0031] The first spring member 71 is provided in the liquid injection channel 64. The first spring member 71 is provided in the liquid injection channel 64 inside the stopper 73. The other end 73B of the stopper 73 is inserted into the first spring member 71. The first spring member 71 imparts elastic force to the stopper 73 toward the packing 74.

[0032] The liquid injection section 61 is provided with a retaining surface 75. The retaining surface 75 is located in the liquid injection channel 64. The retaining surface 75 is the inner wall surface of the liquid injection channel 64. The retaining surface 75 is the surface that holds the first spring member 71.

[0033] If the injection tube 24 is not inserted into the liquid inlet 63, the elastic force from the first spring member 71 causes one end 73A of the stopper 73 to come into contact with the packing 74. As a result, the first valve structure 65 closes.

[0034] When the injection tube 24 is inserted into the liquid inlet 63, the injection tube 24 slides the stopper 73 against the elastic force from the first spring member 71 so that one end 73A of the stopper 73 separates from the packing 74. As a result, the first valve structure 65 opens.

[0035] In particular, liquid can be injected into the storage bag 33 via the liquid inlet 63 multiple times, including the first injection of liquid into the liquid container 30 and subsequent re-injections of liquid into the liquid container 30.

[0036] Thus, in the method of injecting liquid into the liquid container 30, the injection tube 24 is inserted into the liquid inlet 63, which opens the first valve structure 65. With the first valve structure 65 open, the liquid from the injection tube 24 can be injected into the container bag 33. After the liquid from the injection tube 24 has been injected into the container bag 33, the injection tube 24 is removed from the liquid inlet 63. This closes the first valve structure 65.

[0037] <Operation and Effects of the First Embodiment> The operation and effects of the first embodiment will now be described. (1-1) The supply unit 32 includes a liquid inlet 63, a liquid injection channel 64, and a first valve structure 65. The first valve structure 65 can be opened and closed multiple times in the liquid injection channel 64. With this configuration, the liquid container 30 can have liquid injected into the container bag 33 from the liquid inlet 63 multiple times. This allows the liquid container 30 to be injected with liquid multiple times. Therefore, the reusability of the liquid container 30 can be improved.

[0038] In particular, liquid can be reinjected into the liquid container 30 multiple times without having to puncture the container bag 33 each time liquid is injected, or to seal the punctures made in the container bag 33. Liquid can be reinjected into the liquid container 30 multiple times without having to seal the liquid inlet 63 after injecting liquid into the container bag 33 via the liquid inlet 63, or to puncture the sealed liquid inlet 63. Liquid can be injected into the liquid container 30 multiple times without having to inject liquid via the liquid supply port 53.

[0039] (1-2) The first valve structure 65 opens when the injection pipe 24 is inserted. The first valve structure 65 closes when the injection pipe 24 is removed. With this configuration, the first valve structure 65 can be opened and closed by inserting and removing the injection pipe 24.

[0040] (1-3) The first valve structure 65 closes due to the elastic force of the first spring member 71. The first valve structure 65 opens against the elastic force of the first spring member 71. The second valve structure 55 closes due to the elastic force of the second spring member 72. The second valve structure 55 opens against the elastic force of the second spring member 72. With this configuration, the first valve structure 65 and the second valve structure 55 can be opened and closed in the same way using the first spring member 71 and the second spring member 72, respectively.

[0041] [Second Embodiment] Next, a second embodiment will be described. In the following description, redundant explanations of the same configuration as in the previously described embodiment will be omitted or simplified, and configurations that differ from those in the previously described embodiment will be described.

[0042] As shown in Figure 3, in the second embodiment, the first valve structure 65 may include an elastic member 81. The elastic member 81 may be made of rubber, for example. The elastic member 81 can be press-fitted into the liquid inlet 63. The elastic member 81 can be press-fitted into the liquid injection channel 64.

[0043] The elastic member 81 is fixed inside the liquid inlet 63 so as to block the liquid injection channel 64. The elastic member 81 may be placed at any position in the liquid injection channel 64 as long as it can separate the inside from the outside of the containment bag 33. The elastic member 81 is fixed inside the liquid inlet 63 by heat crimping or the like. The injection tube 24 may be a tube with a sharp tip.

[0044] The first valve structure 65 opens when the injection pipe 24 passes through the elastic member 81. This allows liquid to be injected into the storage bag 33 through the liquid inlet 63. The first valve structure 65 closes when the injection pipe 24 is removed from the elastic member 81, as the hole created by the injection pipe 24 closes. This seals the inside of the storage bag 33 from the outside.

[0045] <Operation and Effects of the Second Embodiment> The operation and effects of the second embodiment will now be described. (2-1) The first valve structure 65 includes an elastic member 81 that can be pressed into the liquid inlet 63. The first valve structure 65 opens by passing the injection pipe 24 through the elastic member 81. With this configuration, the first valve structure 65 can open and close the liquid inlet 63 without using the first spring member 71, the stopper 73, and the packing 74. This makes it possible to construct the first valve structure 65 with fewer components.

[0046] [Third Embodiment] Next, a third embodiment will be described. As shown in Figure 4, in the third embodiment, the first valve structure 65 may be a duckbill valve 88. The duckbill valve 88 can be press-fitted into the liquid inlet 63. The duckbill valve 88 can be press-fitted into the liquid injection passage 64. The duckbill valve 88 is a check valve that allows liquid to pass in the direction of injecting the liquid from the liquid inlet 63 into the containment bag 33. The liquid injection section 61 may be equipped with a check valve other than the duckbill valve 88 instead of the duckbill valve 88.

[0047] In the case of the first valve structure 65 using a duckbill valve 88, the duckbill valve 88 opens due to the liquid inflow pressure. In other words, the first valve structure 65 may open when liquid delivery is started and close when liquid delivery is stopped.

[0048] <Operation and Effects of the Third Embodiment> The operation and effects of the third embodiment will now be described. (3-1) The first valve structure 65 is a duckbill valve 88. With this configuration, the first valve structure 65 can open and close the liquid inlet 63 without using the first spring member 71, the stopper 73, and the packing 74. This allows the valve structure to be constructed with fewer components. In addition, liquid can be injected without using the injection pipe 24.

[0049] [Example of changes] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0050] In the first embodiment, the first valve structure 65 and the second valve structure 55 may have the same structure, or they may have different structures, such as different sizes. In the first embodiment, the liquid supply unit 51 and the liquid injection unit 61 may have the same configuration. The first spring member 71 and the second spring member 72 may be members of the same type.

[0051] In the second embodiment, the elastic member 81 only needs to be able to close the through-hole created by the injection pipe 24 by pressurization. The elastic member 81 may be an elastic material such as an elastomer.

[0052] In the third embodiment, liquid may be injected into the storage bag 33 by inserting the injection tube 24 into the liquid inlet 63. In the third embodiment, the removal of air bubbles from inside the storage bag 33 may be promoted by inserting a flow channel tube (not shown) into the liquid inlet 63. In the third embodiment, a mechanism for removing air bubbles from inside the storage bag 33 may be provided in the supply unit 32 separately from the liquid injection unit 61. This eliminates the need to insert the injection tube 24 into the liquid inlet 63 to remove air bubbles from inside the storage bag 33.

[0053] The second valve structure 55 may have any structure. The second valve structure 55 may be configured using a second spring member 72, or it may not have the same configuration as the first valve structure 65 using a first spring member 71. The second spring member 72 may be the same as the first spring member 71, or it may be different from the first spring member 71.

[0054] The liquid container 30 may be housed in a case. The case may be configured such that the liquid supply port 53 is exposed. The case may be configured such that the liquid inlet 63 is exposed. The liquid container 30 may be fitted with a handle for gripping. The liquid container 30 may be fitted with an adapter to assist in mounting it to the mounting portion 20.

[0055] The liquid can be any liquid that adheres to the medium 90 and allows for recording on the medium 90. For example, ink includes functional material particles consisting of solids such as pigments and metal particles dissolved, dispersed, or mixed in a solvent, and encompasses various compositions such as water-based inks, oil-based inks, gel inks, and hot-melt inks.

[0056] As used herein, the expression "at least one of" means one or more of the desired options. For example, as used herein, if there are two options, the expression "at least one of" means either one option or both of the two options. As another example, as used herein, if there are three or more options, the expression "at least one of" means either one option or any combination of two or more options.

[0057] [Note] The following describes the technical concepts and their effects as understood from the embodiments and modifications described above. These technical concepts and their effects can be combined with each other to the extent that they do not contradict each other.

[0058] [1] The liquid container comprises a container bag for containing liquid and a supply unit attached to the container bag, the supply unit having a liquid supply port connectable to a supply pipe of a liquid dispensing device, a liquid supply channel connecting the inside of the container bag and the liquid supply port, a liquid inlet separate from the liquid supply port for injecting liquid into the inside of the container bag, a liquid injection channel connecting the liquid inlet and the inside of the container bag, and a valve structure in the liquid injection channel that can be opened and closed multiple times.

[0059] With this configuration, the liquid container can be filled with liquid from the liquid inlet into the container bag multiple times. This allows the liquid container to be filled with liquid multiple times, thus improving the reusability of the liquid container.

[0060] [2] The liquid container described above, wherein the valve structure is opened by inserting an injection pipe different from the supply pipe and closed by removing the injection pipe. With this configuration, the valve structure can be opened and closed by inserting and removing the injection pipe.

[0061] [3] The liquid container described above, wherein the supply unit has a second valve structure that can be opened and closed multiple times in the liquid supply channel, the valve structure being a first valve structure, the first valve structure closing by the elastic force of a first spring member and opening against the elastic force of the first spring member, and the second valve structure closing by the elastic force of a second spring member and opening against the elastic force of the second spring member.

[0062] With this configuration, the first valve structure and the second valve structure can be opened and closed in the same way using the first spring member and the second spring member, respectively. [4] The liquid container described above, wherein the valve structure includes an elastic member that can be pressed into the liquid inlet, and the valve is opened by passing the injection pipe through the elastic member. With this configuration, the valve structure can be constructed with fewer components compared to the case in which a spring member is used in the valve structure.

[0063] [5] The liquid container described above, wherein the valve structure is a duckbill valve. With this configuration, the valve structure can be constructed with fewer components compared to the case in which a spring member is used.

[0064] [6] A method for injecting liquid into a liquid container comprises a container bag for containing liquid and a supply unit attached to the container bag, wherein the supply unit has a liquid supply port connectable to a supply pipe of a liquid discharge device, a liquid supply channel connecting the inside of the container bag and the liquid supply port, a liquid inlet separate from the liquid supply port into which liquid can be injected into the inside of the container bag, a liquid inlet connecting the liquid inlet and the inside of the container bag, and a valve structure in the liquid inlet channel that can be opened and closed multiple times, and the method includes injecting liquid from an injection pipe different from the supply pipe into the inside of the container bag when the valve structure is open, and closing the valve structure after injecting liquid from the injection pipe into the inside of the container bag. This configuration can achieve the same effect as [1]. [Explanation of Symbols]

[0065] 10...Liquid dispensing device, 11...Liquid dispensing section, 12...Liquid dispensing head, 13...Nozzle, 14...Conveying section, 20...Mounting section, 22...Supply channel, 23...Supply pipe, 24...Injection pipe, 30...Liquid container, 32...Supply section, 33...Container bag, 51...Liquid supply section, 53...Liquid supply port, 54...Liquid supply channel, 54A...Inner wall surface, 55...Second valve structure, 61...Liquid injection section, 63...Liquid injection port, 64...Liquid injection channel, 64A...Inner wall surface, 65...First valve structure, 71...First spring member, 72...Second spring member, 73...Plug, 73A...One end, 73B...Other end, 74...Packing, 75...Retaining surface, 81...Elastic member, 88...Duckbill valve, 90...Medium.

Claims

1. A storage bag for holding liquid, It comprises a supply unit that is attached to the aforementioned storage bag, The aforementioned supply unit is A liquid supply port that can be connected to the supply pipe of the liquid dispensing device, A liquid supply channel connecting the inside of the storage bag and the liquid supply port, In addition to the aforementioned liquid supply port, there is a liquid inlet into which liquid can be injected into the interior of the storage bag, A liquid injection channel connecting the liquid inlet and the inside of the storage bag, The liquid injection channel has a valve structure that can be opened and closed multiple times, A liquid container characterized by the following features.

2. A liquid container according to claim 1, The valve structure opens by inserting an injection pipe different from the supply pipe, and closes by removing the injection pipe. A liquid container characterized by the following features.

3. A liquid container according to claim 2, The supply unit has a second valve structure that can be opened and closed multiple times in the liquid supply channel. The valve structure is a first valve structure, The first valve structure closes due to the elastic force of the first spring member and opens against the elastic force of the first spring member. The second valve structure closes due to the elastic force of the second spring member and opens against the elastic force of the second spring member. A liquid container characterized by the following features.

4. A liquid container according to claim 2, The valve structure includes an elastic member that can be pressed into the liquid inlet, and opens by passing the injection pipe through the elastic member. A liquid container characterized by the following features.

5. A liquid container according to claim 1, The valve structure is a duckbill valve. A liquid container characterized by the following features.

6. A method for injecting liquid into a liquid container comprising a container bag for holding liquid and a supply unit attached to the container bag, The aforementioned supply unit is A liquid supply port that can be connected to the supply pipe of the liquid dispensing device, A liquid supply channel connecting the inside of the storage bag and the liquid supply port, In addition to the aforementioned liquid supply port, there is a liquid inlet into which liquid can be injected into the interior of the storage bag, A liquid injection channel connecting the liquid inlet and the inside of the storage bag, The liquid injection channel has a valve structure that can be opened and closed multiple times, With the valve structure open, liquid from an injection pipe different from the supply pipe is injected into the interior of the storage bag. This includes injecting the liquid from the injection tube into the interior of the containment bag and then closing the valve structure, A method for injecting liquid into a liquid container, characterized by the features described above.

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