Liquid storage body

Abstract

To provide a liquid storage body capable of achieving space saving of a used liquid storage body, as a technique that can contribute to the realization of a sustainable society such as a decarbonized / recycling-oriented society.SOLUTION: A liquid storage body 10 for supplying liquid to a liquid discharge apparatus that discharges liquid comprises a liquid storage bag 20 that stores the liquid, and a connection port portion 30 provided on the liquid storage bag 20 for connecting the liquid storage bag 20 to the liquid discharge apparatus. As the liquid stored in the liquid storage bag 20 decreases, either a length of the liquid storage bag 20 in an extending direction of the connection port portion 30, or a length of the liquid storage bag 20 in a direction intersecting the extending direction and a vertical direction, becomes smaller.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a liquid container. [Background technology]

[0002] Conventionally, a supply method using a liquid container has been known as a method for supplying liquid to a liquid ejection device. Patent Document 1 discloses technology related to a cartridge that includes a liquid container capable of containing a liquid such as ink and a case that contains the liquid container. The liquid container includes a liquid containing bag formed using two resin sheets. When liquid contained in the liquid containing bag is supplied to the liquid ejection device, the two sheets that form the liquid containing bag bend in a direction that brings them into contact with each other. A used liquid container is removed from the cartridge case, and an unused liquid container is attached to the case in place of the used liquid container. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6372322 Summary of the Invention [Problem to be solved by the invention]

[0004] The used liquid container removed from the cartridge case is folded or rolled by the worker. Thus, the way used liquid containers are handled varies depending on the worker. To reuse or recycle the liquid container, it is desirable to reduce the space occupied by the used liquid container. However, if the used liquid container is rolled up in a messy manner, a large amount of space is required to collect the used liquid container.

[0005] An object of the present disclosure is to achieve space saving for a used liquid container. [Means for solving the problem]

[0006] A liquid container according to one aspect of the present disclosure is a liquid container for supplying liquid to a liquid ejection device that ejects liquid, and comprises a liquid storage bag for storing liquid, and a connection port portion provided on the liquid storage bag for connecting the liquid storage bag to the liquid ejection device, and as the liquid stored in the liquid storage bag decreases, the length of the liquid storage bag in the extension direction of the connection port portion, or the length of the liquid storage bag in a direction intersecting the extension direction and the vertical direction, decreases. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to achieve space saving for used liquid containers. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view of a liquid ejection device. [Figure 2] 2 is a schematic view of a liquid container according to the first embodiment. FIG. [Figure 3] FIG. 2 is a bottom view of the liquid container according to the first embodiment. [Figure 4] 3 is a side view showing a state of a liquid containing bag in the liquid container according to the first embodiment. FIG. [Figure 5] FIG. 10 is a bottom view showing a modified example of the liquid container according to the first embodiment. [Figure 6] FIG. 10 is a schematic view of a liquid container according to a second embodiment. [Figure 7] 10 is a side view showing the state of a liquid containing bag in a liquid container according to a second embodiment. FIG. [Figure 8] FIG. 10 is a schematic view of a liquid container according to a third embodiment. [Figure 9] 10 is a side view showing the state of a liquid containing bag in a liquid container according to a third embodiment. FIG. [Figure 10] FIG. 10 is a schematic view of a liquid container according to a fourth embodiment. [Figure 11]10 is a side view showing the state of a liquid containing bag in a liquid container according to a fourth embodiment. FIG. [Figure 12] FIG. 13 is a side view showing a first modified example of the liquid container according to the fourth embodiment. [Figure 13] FIG. 13 is a perspective view showing a second modified example of the liquid container according to the fourth embodiment. [Figure 14] FIG. 13 is a front view showing a third modified example of the liquid container according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the present disclosure, and not all combinations of features described in the following embodiments are necessarily essential to the solutions of the present disclosure. The dimensions, materials, shapes, relative positions, etc. of the components described in the following embodiments may be changed as appropriate depending on the configuration of the liquid container to which the present disclosure is applied, various conditions, etc. Note that the same components will be described with the same reference numerals.

[0010] <<First Embodiment>> The technology described in this specification can contribute to the realization of a sustainable society, such as a carbon-free / recycling-based society. In this embodiment, a liquid container that can save space for a used liquid container will be described as a technology that can contribute to the realization of a sustainable society.

[0011] <Configuration of Liquid Ejection Device> FIG. 1 is a schematic perspective view of a liquid ejection device 100 according to this embodiment. As shown in FIG. 1, the liquid ejection device 100 includes a liquid ejection head 101, a carriage 102, a transport roller 103, a liquid supply unit 105, a liquid supply tube 106, and a recovery unit 107. The liquid ejection device 100 repeats reciprocating movement of the liquid ejection head 101 (main scanning) and transport of a recording sheet P, which is a recording medium, at a predetermined pitch (sub-scanning). The liquid ejection device 100 selectively ejects liquid of multiple colors (e.g., ink) from the liquid ejection head 101 in synchronization with the main scanning and sub-scanning, causing the liquid to land on the recording sheet P, thereby forming characters, symbols, images, and the like. An example of the liquid ejection device 100 is an inkjet printer.

[0012] The recording medium is not limited to the recording sheet P, but may be anything on which ink droplets can land to form an image, etc. For example, recording media of various materials and shapes, such as paper, cloth, optical disc labels, plastic sheets, overhead projector sheets, envelopes, etc., can be used. In addition, in each of the figures referred to below, the Z direction indicates the vertical direction and intersects (orthogonal in this embodiment) the XY plane defined by the X and Y directions.

[0013] The liquid ejection head 101 is detachably mounted on a carriage 102. The carriage 102 is supported by two guide rails 104 so as to be slidable in the X direction. The carriage 102 on which the liquid ejection head 101 is mounted moves back and forth in a straight line along the guide rails 104 by a driving means (not shown) such as a motor.

[0014] The recording sheet P is conveyed by conveying rollers 103, which are conveying means, in a direction intersecting the movement direction of the carriage 102, specifically in a direction (Y direction) perpendicular to the movement direction of the carriage 102. When conveyed by the conveying rollers 103, the recording sheet P faces a liquid ejection unit (not shown) of the liquid ejection head 101. Liquid ejected from the liquid ejection unit of the liquid ejection head 101 lands on the recording sheet P facing the liquid ejection unit of the liquid ejection head 101.

[0015] The liquid ejection head 101 has a plurality of nozzle rows as a plurality of liquid ejection sections, each for ejecting a different color liquid. A plurality of independent liquid containers 10 are attached to the liquid supply unit 105 corresponding to the plurality of color liquids ejected from the liquid ejection head 101. Each liquid container 10 is detachably attached to the liquid supply unit 105 while being housed inside, for example, a case 60 (see also FIGS. 2(a) and 2(b)). The case 60 is formed in a box shape with one end (the -Y direction side) open.

[0016] The liquid supply unit 105 and the liquid ejection head 101 are connected by a plurality of liquid supply tubes 106 corresponding to the plurality of color liquids. By attaching the liquid container 10 to the liquid supply unit 105, it becomes possible to independently supply the liquid of each color contained inside the liquid container 10 to each nozzle row of the liquid ejection head 101. In this way, the liquid ejection device 100 has the function of ejecting the liquid supplied from the liquid container 10.

[0017] A recovery unit 107 is provided in a non-printing area, which is an area within the reciprocating movement range of the liquid ejection head 101 but outside the passing range of the recording sheet P. The recovery unit 107 is disposed at a position facing the liquid ejection portion (not shown) of the liquid ejection head 101 that has moved to the non-printing area. The recovery unit 107 has a cap portion, a suction mechanism, a cleaning blade, etc.

[0018] The cap portion of the recovery unit 107 is a member for capping the liquid ejection portion of the liquid ejection head 101. The suction mechanism of the recovery unit 107 is a mechanism for forcibly sucking liquid while the liquid ejection portion of the liquid ejection head 101 is capped. The cleaning blade of the recovery unit 107 is a member for wiping dirt off the liquid ejection portion of the liquid ejection head 101. Recovery processes such as capping by the cap portion of the recovery unit 107 and suction of liquid by the suction mechanism are performed before the liquid ejection operation of the liquid ejection device 100. Even when the liquid ejection device 100 is operated after being left unused for a long period of time, the recovery process performed by the recovery unit 107 can remove air bubbles remaining in the liquid ejection portion of the liquid ejection head 101, liquid that has become viscous near the ejection ports of the liquid ejection head 101, and the like. This maintains the ejection characteristics of the liquid ejection head 101.

[0019] <Configuration of liquid container> Next, the liquid container 10 according to the first embodiment will be described. As described above, a plurality of independent liquid containers 10 are attached to the liquid supply unit 105 in correspondence with the plurality of color liquids ejected from the liquid ejection head 101. Each liquid container 10 is detachably attached to the liquid supply unit 105 while being housed, for example, inside a case 60. The configuration of each liquid container 10 is basically the same.

[0020] FIG. 2 is a schematic diagram of the liquid container 10 according to the first embodiment. In FIGS. 2 to 14, the X, Y, and Z directions indicate the directions when the liquid container 10 is attached to the liquid supply unit 105. FIG. 2(a) is a plan view of the liquid container 10 according to the first embodiment. FIG. 2(b) is a side view of the liquid container 10 according to the first embodiment. As shown in FIGS. 2(a) and 2(b), the liquid container 10 according to the first embodiment includes a liquid containing bag 20 and a connection port 30 for connecting the liquid containing bag 20 to the liquid discharge device 100.

[0021] The liquid containing bag 20 contains ink as an example of a liquid to be supplied to the liquid ejection device 100. The liquid containing bag 20 includes a first sheet member 21 and a second sheet member 22 that overlaps vertically above the first sheet member 21. The first sheet member 21 and the second sheet member 22 are formed into a rectangular sheet shape using the same resin material. Peripheral portions 40 of the first sheet member 21 and the second sheet member 22 are joined by thermal welding. Furthermore, portions of the peripheral portions 40 that are located on one short side of the rectangle of the first sheet member 21 and the second sheet member 22 (the -Y direction side) are joined to the connection port portion 30 by thermal welding. As a result, ink is contained in a gap 25 between the first sheet member 21 and the second sheet member 22 that is surrounded by the peripheral portion 40.

[0022] In order to suppress evaporation of water contained in the ink and permeation of the solvent (ensuring gas barrier properties), the liquid containing bag 20 (first sheet member 21 and second sheet member 22) is configured with multiple layers. For example, the liquid containing bag 20 (first sheet member 21 and second sheet member 22) has an outer layer that faces outward and is in contact with the outside air, and an inner layer that faces inward and is in contact with the ink. The outer layer of the liquid containing bag 20 is made of polyethylene terephthalate (PET). The inner layer of the liquid containing bag 20 is made of polypropylene (PP). Between the outer and inner layers of the liquid containing bag 20, an aluminum layer is vapor-deposited to ensure gas barrier properties.

[0023] The connection port 30 is joined to the longitudinal end (the end in the -Y direction) of the liquid containing bag 20 (the first sheet member 21 and the second sheet member 22). The connection port 30 is formed in a tubular shape extending in the longitudinal direction of the liquid containing bag 20 (the Y direction intersecting with the Z direction (vertical direction)), and is connected to the liquid ejection device 100. When the connection port 30 is connected to the liquid ejection device 100, the interior of the liquid containing bag 20 and the interior of the liquid supply tube 106 are in communication. The connection port 30 has a check valve (not shown) and a seal rubber (not shown). The check valve of the connection port 30 prevents air from entering the interior of the liquid containing bag 20 (backflow) and ink from dripping from the connection port 30 when the liquid container 10 is detached from the liquid supply unit 105. The seal rubber of the connection port 30 ensures the sealing performance of the connection port 30 when connected to the liquid ejection device 100.

[0024] FIG. 3 is a bottom view of the liquid container 10 according to the first embodiment. As shown in FIG. 3, the liquid container 10 according to the first embodiment further includes a biasing member 35. The biasing member 35 is formed using a metal wire that has a curled shape similar to a so-called "blowback." The biasing member 35 is attached to the center of the bottom surface of the liquid containing bag 20 (first sheet member 21) so as to extend from the side where the connection port 30 is provided to the opposite side from the connection port 30. As a result, the biasing member 35 applies a biasing force to wind the liquid containing bag 20 into a roll (scroll) due to the curled shape of the biasing member 35. An example of the wire used for the biasing member 35 is a stainless steel wire with a wire diameter of 0.3 mm. However, the diameter and material of the wire used for the biasing member 35 are not limited thereto.

[0025] Next, the state of the liquid containing bag 20 depending on the remaining amount of ink will be described. Fig. 4 is a side view showing the state of the liquid containing bag 20 in the liquid container 10 according to the first embodiment. Fig. 4(a) is a side view showing a state in which the liquid containing bag 20 is filled with ink. Fig. 4(b) is a side view showing a state in which the ink inside the liquid containing bag 20 is decreasing. Fig. 4(c) is a side view showing a state in which there is only a small amount of ink inside the liquid containing bag 20.

[0026] As shown in FIG. 4(a), when the liquid containing bag 20 is filled with ink, a force that stretches the liquid containing bag 20 into a flat plate is generated in accordance with the weight and volume of the ink, and the liquid containing bag 20 is stretched into a flat plate against the biasing force of the biasing member 35. As shown in FIG. 4(b), as ink is supplied from the liquid container 10 to the liquid ejection device 100 and the ink inside the liquid containing bag 20 decreases, the liquid containing bag 20 is gradually rolled up into a roll by the biasing force of the biasing member 35. At this time, the rolled shape of the liquid containing bag 20 is maintained at a position where the force F11 that rolls up the liquid containing bag 20 based on the biasing force of the biasing member 35 is equal to the force F12 that stretches the liquid containing bag 20 into a flat plate in accordance with the weight and volume of the remaining ink. The biasing force of the biasing member 35 is determined by the material, diameter, and curl of the wire used in the biasing member 35. The force F12 that stretches the liquid containing bag 20 into a flat plate is determined by the pressure of the ink inside the liquid containing bag 20. As shown in Figure 4(c), when there is only a small amount of ink inside the liquid containing bag 20, the pressure of the ink inside the liquid containing bag 20 approaches zero, and the liquid containing bag 20 is rolled up to the vicinity of the connection port 30 by the biasing force of the biasing member 35.

[0027] In this way, the liquid containing bag 20 changes from a flat, elongated state to a rolled state extending in the width direction (X direction) of the liquid containing bag 20 inside the case 60. Therefore, as the ink contained in the liquid containing bag 20 decreases, the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. The used liquid containing body 10 shown in FIG. 4(c) is detached from the liquid supply unit 105 and taken out from the case 60. Then, in place of the used liquid containing body 10, an unused liquid containing body 10 is accommodated inside the case 60 and attached to the liquid supply unit 105.

[0028] In this embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up, and the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. This makes it possible to prevent the space required to collect a used liquid containing body 10 from increasing. It also makes it possible to prevent differences in the space required to collect a used liquid containing body 10 from occurring depending on how the worker handles the liquid containing body 10. This makes it possible to achieve space saving for a used liquid containing body 10.

[0029] As described above, the liquid container 10 according to the first embodiment can achieve space-saving for used liquid containers 10. That is, in this embodiment, as the ink (liquid) contained in the liquid container bag 20 decreases, the liquid container bag 20 is rolled up, and the length of the liquid container bag 20 in the extension direction of the connection port portion 30 decreases. This can prevent the space required to collect used liquid containers 10 from increasing. Furthermore, it can prevent differences in the space required to collect used liquid containers 10 from occurring depending on how the liquid container 10 is handled by the worker. In this way, space-saving for used liquid containers 10 can be achieved.

[0030] Furthermore, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up by the biasing force of the biasing member 35. This allows the liquid containing bag 20 to have a fixed shape (flat plate-like) when filled with ink, and the biasing force of the biasing member 35 ensures that the liquid containing bag 20 can be rolled up to become smaller.

[0031] Moreover, the biasing member 35 is formed using a wire rod and attached to the liquid containing bag 20. This allows the structure of the biasing member 35 to be simplified.

[0032] In the first embodiment described above, one biasing member 35 is attached to the bottom surface of the liquid containing bag 20 (first sheet member 21), but this is not limiting. FIG. 5 is a bottom view showing a modified example of the liquid container 10 according to the first embodiment. As shown in FIG. 5, two biasing members 35 arranged in parallel facing the longitudinal direction of the liquid containing bag 20 may be attached to the bottom surface of the liquid containing bag 20 (first sheet member 21). Furthermore, three or more biasing members 35 arranged in parallel may be attached to the bottom surface of the liquid containing bag 20 (first sheet member 21), depending on the size of the liquid containing bag 20 in the width direction (X direction).

[0033] In the first embodiment described above, the biasing member 35 is formed using a wire rod having a circular cross section, but this is not limited to this. For example, the biasing member 35 may be formed using a plate material having a rectangular cross section. An example of the plate material used for the biasing member 35 is a stainless steel plate material having a thickness of 0.3 mm and a width of 2.0 mm.

[0034] <<Second embodiment>> Next, a second embodiment will be described. Since the individual components in the second embodiment have the same configuration as those in the first embodiment, they will be described using the same reference numerals as those in the first embodiment. In this embodiment, a configuration will be described in which the liquid containing bag 20 can be rolled up without using a biasing member.

[0035] <Configuration of liquid container> FIG. 6 is a schematic diagram of a liquid container 10 according to the second embodiment. FIG. 6(a) is a side view of the liquid container 10 according to the second embodiment. FIG. 6(b) is a side view showing the liquid container 10 in an unfilled state. As shown in FIGS. 6(a) and 6(b), the liquid container 10 according to the second embodiment includes a liquid containing bag 20 and a connection port 30. The connection port 30 according to the second embodiment is configured similarly to the connection port 30 according to the first embodiment.

[0036] The liquid containing bag 20 contains ink to be supplied to the liquid ejection device 100. The liquid containing bag 20 includes a first sheet member 21 and a second sheet member 22 that overlaps the first sheet member 21 vertically above. The first sheet member 21 is formed in a rectangular sheet shape using a resin material. The second sheet member 22 is formed in a rectangular sheet shape using a resin material different from that of the first sheet member 21. Outer peripheries 40 of the first sheet member 21 and the second sheet member 22 are joined by thermal welding. Furthermore, portions of the outer periphery 40 that are located on one short side of the rectangle of the first sheet member 21 and the second sheet member 22 (the -Y direction side) are joined to the connection port 30 by thermal welding. As a result, ink is contained in a gap 25 between the first sheet member 21 and the second sheet member 22 that is surrounded by the outer periphery 40.

[0037] In the second embodiment, the linear expansion coefficient X2 of the material of the second sheet member 22 is greater than the linear expansion coefficient X1 of the material of the first sheet member 21. In other words, there is a relationship of X2>X1. For example, the inner layer of the first sheet member 21 is formed using polypropylene (PP). The outer layer of the first sheet member 21 is formed using polyamide (PA). The inner layer of the second sheet member 22 is formed using the same polypropylene as the inner layer of the first sheet member 21. The outer layer of the second sheet member 22 is formed using a type of polypropylene that has a higher melting point than the polypropylene of the inner layer. The linear expansion coefficient X1 of polyamide, which is the material of the first sheet member 21, is, for example, 8×10 -5 / °C. The linear expansion coefficient X2 of polypropylene, which is the material of the second sheet member 22, is, for example, 11×10 -5 / ℃.

[0038] The welding temperature for the outer periphery 40 of the first sheet member 21 and the second sheet member 22 is approximately 140°C to 160°C. Because the linear expansion coefficient X2 of the material of the second sheet member 22 is greater than the linear expansion coefficient X1 of the material of the first sheet member 21, when the second sheet member 22 is cooled to room temperature after welding, the outer periphery 40 of the second sheet member 22 shrinks more than the outer periphery 40 of the first sheet member 21. A force based on the difference between the linear expansion coefficients of the material of the first sheet member 21 and the material of the second sheet member 22 acts on the outer periphery 40 that has been cooled to room temperature after welding. Therefore, as shown in FIG. 6(b), the unfilled liquid containing bag 20 is rolled up by a force based on the difference between the linear expansion coefficients of the material of the first sheet member 21 and the material of the second sheet member 22. At this time, a force is applied to roll up the liquid containing bag 20 along the longitudinal direction (Y direction) of the liquid containing bag 20 (first sheet member 21 and second sheet member 22), and the second sheet member 22 of the liquid containing bag 20 is positioned more inward than the first sheet member 21 and rolled up into a roll.

[0039] The width (width in the Y direction) of the portions of the outer circumferential portion 40 located on the short sides of the rectangles of the first sheet member 21 and the second sheet member 22 may be wider than the width (width in the X direction) of the portions of the first sheet member 21 and the second sheet member 22 located on the long sides of the rectangles. This makes it possible to suppress the application of a force that rolls up the liquid containing bag 20 in a direction (X direction) perpendicular to the longitudinal direction of the liquid containing bag 20. Furthermore, the portions of the outer circumferential portion 40 located on the short sides of the rectangles of the first sheet member 21 and the second sheet member 22 may be formed in a wave shape whose height changes along the longitudinal direction of the liquid containing bag 20. This makes it possible to suppress the application of a force that rolls up the liquid containing bag 20 in a direction (X direction) perpendicular to the longitudinal direction of the liquid containing bag 20.

[0040] Next, the state of the liquid containing bag 20 depending on the remaining amount of ink will be described. Fig. 7 is a side view showing the state of the liquid containing bag 20 in the liquid container 10 according to the second embodiment. Fig. 7(a) is a side view showing a state in which the liquid containing bag 20 is filled with ink. Fig. 7(b) is a side view showing a state in which the ink inside the liquid containing bag 20 is decreasing. Fig. 7(c) is a side view showing a state in which there is only a small amount of ink inside the liquid containing bag 20.

[0041] 7(a), when the liquid containing bag 20 is filled with ink, a force that stretches the liquid containing bag 20 into a flat plate is generated according to the weight and volume of the ink, and the liquid containing bag 20 is stretched into a flat plate. As shown in FIG. 7(b), as ink is supplied from the liquid container 10 to the liquid discharge device 100 and the ink inside the liquid containing bag 20 decreases, the liquid containing bag 20 is gradually rolled up into a roll. At this time, the rolled shape of the liquid containing bag 20 is maintained at a position where a force F11 that rolls up the liquid containing bag 20, which is based on the difference between the linear expansion coefficients of the material of the first sheet member 21 and the material of the second sheet member 22, is equal to a force F12 that stretches the liquid containing bag 20 into a flat plate. Furthermore, a force F11 that rolls up the liquid containing bag 20 acts along the longitudinal direction (Y direction) of the liquid containing bag 20 (first sheet member 21 and second sheet member 22), and the second sheet member 22 of the liquid containing bag 20 is wound up into a roll with the second sheet member 22 positioned more inward than the first sheet member 21. As shown in FIG. 7(c), when there is only a small amount of ink inside the liquid containing bag 20, the ink pressure inside the liquid containing bag 20 approaches zero, and the liquid containing bag 20 is wound up into a roll up to the vicinity of the connection port 30.

[0042] In this way, the liquid containing bag 20 changes from a flat, elongated state to a rolled state extending in the width direction (X direction) of the liquid containing bag 20 inside the case 60. Therefore, as the ink contained in the liquid containing bag 20 decreases, the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. The used liquid containing body 10 shown in FIG. 7(c) is detached from the liquid supply unit 105 and taken out from the case 60. Then, in place of the used liquid containing body 10, an unused liquid containing body 10 is accommodated inside the case 60 and attached to the liquid supply unit 105.

[0043] In this embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up, and the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. This makes it possible to prevent the space required to collect a used liquid containing body 10 from increasing. It also makes it possible to prevent differences in the space required to collect a used liquid containing body 10 from occurring depending on how the worker handles the liquid containing body 10. This makes it possible to achieve space saving for a used liquid containing body 10.

[0044] As described above, according to the liquid container 10 of the second embodiment, similar to the first embodiment, it is possible to achieve space saving for the used liquid container 10.

[0045] Furthermore, in the second embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up by a force generated based on the difference between the linear expansion coefficient of the material of the first sheet member 21 and the linear expansion coefficient of the material of the second sheet member 22. This makes it possible to roll up the liquid containing bag 20 to make it smaller with a simple configuration without using a biasing member or the like.

[0046] In the second embodiment described above, the outer layer of the first sheet member 21 is formed using polyamide, and the outer layer of the second sheet member 22 is formed using polypropylene, but this is not limited thereto. For example, to create a difference in the linear expansion coefficient between the material of the first sheet member 21 and the material of the second sheet member 22, a metal layer different from the layer for ensuring gas barrier properties may be vapor-deposited on the outer layer of the first sheet member 21. In this case, the outer layer of the second sheet member 22 may be formed using polyethylene terephthalate.

[0047] <<Third Embodiment>> Next, a third embodiment will be described. Since the individual components in the third embodiment have the same configuration as those in the first embodiment, they will be described using the same reference numerals as those in the first embodiment. In this embodiment, a configuration will be described in which the liquid containing bag 20 can be rolled up without using a biasing member, a first sheet member 21, a second sheet member 22, or the like, which have different linear expansion coefficients.

[0048] <Configuration of liquid container> FIG. 8 is a schematic diagram of a liquid container 10 according to the third embodiment. FIG. 8(a) is a side view of the liquid container 10 according to the third embodiment. FIG. 8(b) is a side view showing the liquid container 10 in an unfilled state. As shown in FIGS. 8(a) and 8(b), the liquid container 10 according to the third embodiment includes a liquid containing bag 20 and a connection port 30. The connection port 30 according to the third embodiment is configured similarly to the connection port 30 according to the first embodiment.

[0049] The liquid containing bag 20 contains ink to be supplied to the liquid ejection device 100. The liquid containing bag 20 includes a first sheet member 21 and a second sheet member 22 that overlaps the first sheet member 21 vertically above. As in the first embodiment, the first sheet member 21 and the second sheet member 22 are formed into a rectangular sheet shape using the same resin material. Peripheral portions 40 of the first sheet member 21 and the second sheet member 22 are joined by thermal welding. Furthermore, a portion of the peripheral portion 40 that is located on one short side of the rectangle of the first sheet member 21 and the second sheet member 22 (the -Y direction side) is joined to the connection port portion 30 by thermal welding. As a result, ink is contained in a gap 25 between the first sheet member 21 and the second sheet member 22 that is surrounded by the peripheral portion 40.

[0050] In the third embodiment, the liquid containing bag 20 has a curl. For example, the liquid containing bag 20 can be curled by wrapping the liquid containing bag 20 around a cylindrical rod that has been heated to a temperature lower than the melting point of the liquid containing bag 20. Therefore, as shown in FIG. 8(b), the liquid containing bag 20 in an unfilled state is wound into a roll due to the curl that has formed on the liquid containing bag 20.

[0051] Next, the state of the liquid containing bag 20 according to the remaining amount of ink will be described. Fig. 9 is a side view showing the state of the liquid containing bag 20 in the liquid container 10 according to the third embodiment. Fig. 9(a) is a side view showing a state in which the liquid containing bag 20 is filled with ink. Fig. 9(b) is a side view showing a state in which the ink inside the liquid containing bag 20 is decreasing. Fig. 9(c) is a side view showing a state in which there is only a small amount of ink inside the liquid containing bag 20.

[0052] As shown in FIG. 9( a), when the liquid containing bag 20 is filled with ink, a force that stretches the liquid containing bag 20 into a flat plate is generated in accordance with the weight and volume of the ink, and the liquid containing bag 20 stretches into a flat plate against the curl of the liquid containing bag 20. As shown in FIG. 9( b), as ink is supplied from the liquid container 10 to the liquid ejection device 100 and the ink inside the liquid containing bag 20 decreases, the liquid containing bag 20 is gradually rolled up due to the curl of the liquid containing bag 20. At this time, the rolled shape of the liquid containing bag 20 is maintained at a position where the force F11 that rolls the liquid containing bag 20 due to the curl and the force F12 that stretches the liquid containing bag 20 into a flat plate are equal. As shown in FIG. 9( c), when the ink inside the liquid containing bag 20 becomes small, the pressure of the ink inside the liquid containing bag 20 approaches zero, and the liquid containing bag 20 is rolled up due to the curl up to the vicinity of the connection port 30.

[0053] In this way, the liquid containing bag 20 changes from a flat, elongated state to a rolled state extending in the width direction (X direction) of the liquid containing bag 20 inside the case 60. Therefore, as the ink contained in the liquid containing bag 20 decreases, the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. The used liquid containing body 10 shown in FIG. 9(c) is detached from the liquid supply unit 105 and taken out from the case 60. Then, in place of the used liquid containing body 10, an unused liquid containing body 10 is accommodated inside the case 60 and attached to the liquid supply unit 105.

[0054] In this embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up, and the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. This makes it possible to prevent the space required to collect a used liquid containing body 10 from increasing. It also makes it possible to prevent differences in the space required to collect a used liquid containing body 10 from occurring depending on how the worker handles the liquid containing body 10. This makes it possible to achieve space saving for a used liquid containing body 10.

[0055] As described above, according to the liquid container 10 of the third embodiment, similar to the first embodiment, it is possible to achieve space saving for the used liquid container 10.

[0056] Furthermore, in the third embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is rolled up due to the curling tendency of the liquid containing bag 20. This makes it possible to roll up the liquid containing bag 20 to make it smaller with a simple configuration without using a biasing member or the like.

[0057] In the third embodiment described above, the first sheet member 21 and the second sheet member 22 are formed using the same resin material, but this is not limiting. For example, the second sheet member 22 may be formed using a resin material different from that of the first sheet member 21 in order to make it easier to impart a curl to the liquid containing bag 20.

[0058] In the first to third embodiments described above, the liquid containing bag 20 is rolled up as the ink contained in the liquid containing bag 20 decreases, and the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases, but this is not limiting. For example, the liquid containing bag 20 may be configured to be rolled up as the ink contained in the liquid containing bag 20 decreases, and the length of the liquid containing bag 20 in a direction intersecting the extension direction of the connection port 30 and the vertical direction (for example, X direction) decreases. This makes it possible to achieve space-saving storage of the used liquid container 10, similar to the first embodiment.

[0059] In the first to third embodiments described above, a mark indicating the up-down (vertical) orientation of the liquid container 10, for example, a mark indicating that the surface of the second sheet member 22 is the upper surface, may be provided on the surface of the second sheet member 22. This prevents the liquid container 10 from being placed in the case 60 with the up-down (vertical) orientation incorrect, and the liquid containing bag 20 from coming into contact with the bottom surface of the case 60 when rolled up.

[0060] <<Fourth Embodiment>> Next, a fourth embodiment will be described. Since the individual components in the fourth embodiment have the same configuration as those in the first embodiment, they will be described using the same reference numerals as those in the first embodiment. In this embodiment, a configuration will be described in which a fold is formed in the liquid containing bag 20 instead of a curl.

[0061] <Configuration of liquid container> FIG. 10 is a schematic diagram of a liquid container 10 according to the fourth embodiment. FIG. 10(a) is a side view of the liquid container 10 according to the fourth embodiment. FIG. 10(b) is a side view showing the liquid container 10 in an unfilled state. As shown in FIGS. 10(a) and 10(b), the liquid container 10 according to the fourth embodiment includes a liquid containing bag 20 and a connection port 30. The connection port 30 according to the fourth embodiment is configured similarly to the connection port 30 according to the first embodiment.

[0062] The liquid containing bag 20 contains ink to be supplied to the liquid ejection device 100. The liquid containing bag 20 includes a first sheet member 21 and a second sheet member 22 that overlaps the first sheet member 21 vertically above. As in the first embodiment, the first sheet member 21 and the second sheet member 22 are formed into a rectangular sheet shape using the same resin material. Peripheral portions 40 of the first sheet member 21 and the second sheet member 22 are joined by thermal welding. Furthermore, a portion of the peripheral portion 40 that is located on one short side of the rectangle of the first sheet member 21 and the second sheet member 22 (the -Y direction side) is joined to the connection port portion 30 by thermal welding. As a result, ink is contained in a gap 25 between the first sheet member 21 and the second sheet member 22 that is surrounded by the peripheral portion 40.

[0063] In the fourth embodiment, as shown in FIG. 10(b), the liquid containing bag 20 has a plurality of (e.g., eleven) folds 26 formed therein for folding the liquid containing bag 20. The folds 26 are arranged along the extension direction (Y direction) of the connection opening 30 and extend in the width direction (X direction) of the liquid containing bag 20. For example, the folds 26 of the liquid containing bag 20 can be formed by bringing the liquid containing bag 20, on which the folds 26 have been formed manually, into contact with a mountain-shaped block heated to a temperature lower than the melting point of the liquid containing bag 20. Therefore, as shown in FIG. 10(b), the unfilled liquid containing bag 20 is folded in an accordion-like manner by the folds formed in the folds 26. The folds 26 of the liquid containing bag 20 may be formed using a processing device capable of automatically forming the folds 26 and folds in the liquid containing bag 20.

[0064] Next, the state of the liquid containing bag 20 depending on the remaining amount of ink will be described. Fig. 11 is a side view showing the state of the liquid containing bag 20 in the liquid container 10 according to the fourth embodiment. Fig. 11(a) is a side view showing a state in which the liquid containing bag 20 is filled with ink. Fig. 11(b) is a side view showing a state in which the ink inside the liquid containing bag 20 is decreasing. Fig. 11(c) is a side view showing a state in which there is only a small amount of ink inside the liquid containing bag 20.

[0065] 11(a), when the liquid containing bag 20 is filled with ink, a force is generated in accordance with the weight and volume of the ink that stretches the liquid containing bag 20 into a flat plate, and the liquid containing bag 20 stretches into a flat plate against the creases formed on each fold 26 of the liquid containing bag 20. As shown in FIG. 11(b), as ink is supplied from the liquid container 10 to the liquid discharge device 100 and the ink inside the liquid containing bag 20 decreases, the liquid containing bag 20 is gradually folded by the creases formed on each fold 26. At this time, the folded shape of the liquid containing bag 20 is maintained at a position where a force F21 that folds the liquid containing bag 20 based on the creases is equal to a force F22 that stretches the liquid containing bag 20 into a flat plate in accordance with the weight and volume of the remaining ink. As shown in Figure 11(c), when there is only a small amount of ink inside the liquid containing bag 20, the ink pressure inside the liquid containing bag 20 approaches zero, and the liquid containing bag 20 is folded into an accordion fold due to the creases of each fold 26.

[0066] In this way, the liquid containing bag 20 changes from a flat, extended state to a folded state like an accordion fold inside the case 60. Therefore, as the ink contained in the liquid containing bag 20 decreases, the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. The used liquid containing body 10 shown in FIG. 11(c) is detached from the liquid supply unit 105 and taken out from the case 60. Then, in place of the used liquid containing body 10, an unused liquid containing body 10 is accommodated inside the case 60 and attached to the liquid supply unit 105.

[0067] In this embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is folded, and the length of the liquid containing bag 20 in the extension direction (Y direction) of the connection port 30 decreases. This makes it possible to prevent the space required to collect a used liquid containing body 10 from increasing. It also makes it possible to prevent differences in the space required to collect a used liquid containing body 10 from occurring depending on how the worker handles the liquid containing body 10. This makes it possible to achieve space saving for a used liquid containing body 10.

[0068] As described above, the liquid container 10 according to the fourth embodiment can save space when the liquid container 10 is used. That is, in this embodiment, as the ink (liquid) contained in the liquid container bag 20 decreases, the liquid container bag 20 is folded, and the length of the liquid container bag 20 in the extension direction of the connection port 30 decreases. This prevents the space required to collect the used liquid container 10 from increasing. Furthermore, it prevents differences in the space required to collect the used liquid container 10 from occurring depending on how the liquid container 10 is handled by the worker. In this way, it is possible to save space when the liquid container 10 is used.

[0069] Furthermore, in the fourth embodiment, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is folded along the creases formed in the multiple folds 26. This allows the liquid containing bag 20 to be folded and made smaller with a simple configuration without using a biasing member or the like.

[0070] In the fourth embodiment described above, the first sheet member 21 and the second sheet member 22 are formed using the same resin material, but this is not limiting. For example, the second sheet member 22 may be formed using a resin material different from that of the first sheet member 21 to make it easier to create creases in the folds 26.

[0071] In the fourth embodiment described above, the thickness of the portions of the liquid containing bag 20 (the first sheet member 21 and the second sheet member 22) between the folds 26 may be set to a thickness that makes the liquid containing bag 20 less likely to deform. This makes it possible to prevent unnecessary deformation of the portions of the liquid containing bag 20 between the folds 26, and the creases formed in the folds 26 allow the liquid containing bag 20 to be folded reliably.

[0072] In the fourth embodiment described above, the lengths of the portions between the folds 26 in the liquid containing bag 20 are the same, but this is not limited to this. FIG. 12 is a side view showing a first modified example of the liquid container 10 according to the fourth embodiment. As shown in FIG. 12, the lengths of the portions between the folds 26 in the liquid containing bag 20 may be configured to increase toward the connection port 30. If the lengths of the portions between the folds 26 in the liquid containing bag 20 are small, the ink volume in the portions between the folds 26 will be small. For this reason, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is folded toward the connection port 30 in order of the lengths of the portions between the folds 26 in the liquid containing bag 20 from the smallest to the most distant from the connection port 30. This makes it easier for the ink contained in the liquid containing bag 20 to decrease.

[0073] In the fourth embodiment described above, when the fold 26 of the first sheet member 21 in the liquid containing bag 20 has a mountain fold, the fold 26 of the second sheet member 22 opposite the fold 26 has a valley fold, but this is not limited to this. Also, when the fold 26 of the first sheet member 21 in the liquid containing bag 20 has a valley fold, the fold 26 of the second sheet member 22 opposite the fold 26 has a mountain fold, but this is not limited to this.

[0074] FIG. 13 is a perspective view showing a second modified example of the liquid container 10 according to the fourth embodiment. As shown in FIG. 13, the first sheet member 21 may have a first fold 26A, which is a first fold for folding the liquid containing bag 20. The second sheet member 22 may have a second fold 26B, which is disposed opposite the first fold 26A and is a second fold oriented symmetrically to the first fold. The first sheet member 21 has a plurality of first folds 26A disposed along the extension direction of the connection port 30, and the second sheet member 22 has a plurality of second folds 26B disposed along the extension direction of the connection port 30. The first folds 26A and the second folds 26B extend in the width direction (X direction) of the liquid containing bag 20. For example, if the first fold 26A has a first mountain fold, the second fold 26B opposite the first fold 26A has a second mountain fold that is symmetrical to the first fold. If the first fold 26A has a first valley fold, the second fold 26B opposite the first fold 26A has a second valley fold that is symmetrical to the first fold. As a result, as the ink contained in the liquid containing bag 20 decreases, the liquid containing bag 20 is folded by the first and second folds, and the length of the liquid containing bag 20 in the extension direction of the connection port 30 decreases. Therefore, as in the fourth embodiment, space saving for used liquid containers 10 can be achieved.

[0075] In a second modified example of the liquid container 10 according to the fourth embodiment, the first sheet member 21 may have a plurality of first folds 26A arranged along the direction intersecting the extension direction and vertical direction of the connection port 30 (for example, the X direction perpendicular to the extension direction and vertical direction). The second sheet member 22 may have a plurality of second folds 26B arranged along the direction intersecting the extension direction and vertical direction of the connection port 30. The first folds 26A and the second folds 26B may extend in the extension direction (Y direction) of the connection port 30. As a result, as the ink contained in the liquid container 20 decreases, the liquid container 20 is folded along the first folds and the second folds, thereby reducing the length of the liquid container 20 in the direction intersecting the extension direction and vertical direction of the connection port 30 (X direction). Therefore, similar to the fourth embodiment, it is possible to achieve space-saving storage of a used liquid container 10.

[0076] In the fourth embodiment described above, the liquid containing bag 20 has a plurality of folds 26 arranged along the extension direction (Y direction) of the connection port 30, but this is not limiting. FIG. 14 is a front view showing a third modified example of the liquid container 10 according to the fourth embodiment. As shown in FIG. 14, the liquid containing bag 20 may have a plurality of folds 26 arranged along the extension direction of the connection port 30 and a direction intersecting the vertical direction (for example, the X direction perpendicular to the extension direction and the vertical direction). The plurality of folds 26 may also extend in the extension direction (Y direction) of the connection port 30. This allows the liquid containing bag 20 to be folded as the ink contained in the liquid containing bag 20 decreases, thereby reducing the length of the liquid containing bag 20 in the direction intersecting the extension direction of the connection port 30 and the vertical direction (X direction). Therefore, similar to the fourth embodiment, it is possible to achieve space-saving storage of a used liquid container 10.

[0077] <<Other embodiments>> The disclosure of this embodiment includes configurations typified by the following liquid container examples.

[0078] <Configuration 1> A liquid container for supplying liquid to a liquid ejection device that ejects liquid, a liquid containing bag for containing a liquid; a connection port provided on the liquid containing bag for connecting the liquid containing bag to the liquid discharge device; Equipped with A liquid container characterized in that the length of the liquid containing bag in the extension direction of the connection port portion, or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction, decreases as the liquid contained in the liquid containing bag decreases.

[0079] <Configuration 2> The liquid container described in configuration 1, wherein the liquid containing bag is rolled up as the liquid contained in the liquid containing bag decreases, thereby reducing the length of the liquid containing bag in the extension direction or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction.

[0080] <Configuration 3> 3. The liquid container according to claim 2, wherein the liquid containing bag is rolled up to reduce the length of the liquid containing bag in the stretching direction.

[0081] <Configuration 4> a biasing member that applies a biasing force to roll up the liquid containing bag; The liquid container according to configuration 2 or 3, wherein the liquid containing bag is rolled up by the biasing force of the biasing member as the liquid contained in the liquid containing bag decreases.

[0082] <Configuration 5> The liquid container according to configuration 4, wherein the biasing member is formed using a wire and attached to the liquid containing bag.

[0083] <Configuration 6> The liquid containing bag is a first sheet member formed in a sheet shape; a second sheet member formed in a sheet shape and overlapping the first sheet member; Equipped with A liquid is contained between the first sheet member and the second sheet member, the linear expansion coefficient of the material of the first sheet member and the linear expansion coefficient of the material of the second sheet member are different from each other, A liquid container as described in configuration 2 or 3, wherein as the liquid contained in the liquid containing bag decreases, the liquid containing bag is rolled up by a force generated based on the difference between the linear expansion coefficient of the material of the first sheet member and the linear expansion coefficient of the material of the second sheet member.

[0084] <Configuration 7> The liquid containing bag has a curled habit, The liquid container according to configuration 2 or 3, wherein the liquid containing bag is rolled up due to the curl formed in the liquid containing bag as the liquid contained in the liquid containing bag decreases.

[0085] <Configuration 8> The liquid container described in configuration 1, wherein the liquid containing bag is folded as the amount of liquid contained in the liquid containing bag decreases, thereby reducing the length of the liquid containing bag in the extension direction or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction.

[0086] <Configuration 9> the liquid containing bag has a crease formed thereon for folding the liquid containing bag, 9. The liquid container according to configuration 8, wherein the liquid containing bag is folded along the crease formed on the fold as the liquid contained in the liquid containing bag decreases.

[0087] <Configuration 10> 10. The liquid container according to configuration 9, wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in the extension direction.

[0088] <Configuration 11> 11. The liquid container according to claim 10, wherein the liquid containing bag has a plurality of the folds arranged along the stretching direction.

[0089] <Configuration 12> 12. The liquid container according to claim 11, wherein the length of the portion between the plurality of folds in the liquid containing bag increases toward the connection port.

[0090] <Configuration 13> The liquid containing bag is a first sheet member formed in a sheet shape; a second sheet member formed in a sheet shape and overlapping the first sheet member; Equipped with A liquid is contained between the first sheet member and the second sheet member, the first sheet member has a first fold line with a first crease for folding the liquid containing bag; the second sheet member has a second crease disposed opposite the first crease and having a second crease symmetrical to the first crease; A liquid container as described in configuration 8, wherein the liquid containing bag is folded along the first crease on the first fold and the second crease on the second fold as the liquid contained in the liquid containing bag decreases.

[0091] <Configuration 14> 14. The liquid container according to claim 13, wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in the extension direction.

[0092] <Configuration 15> the first sheet member has a plurality of the first folds arranged along the stretching direction, 15. The liquid container according to claim 14, wherein the second sheet member has a plurality of the second folds arranged along the stretching direction.

[0093] <Configuration 16> 10. The liquid container according to configuration 9, wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in a direction intersecting the stretching direction and the vertical direction.

[0094] <Configuration 17> 17. The liquid container according to claim 16, wherein the liquid containing bag has a plurality of folds arranged along a direction intersecting the stretching direction and the vertical direction. [Explanation of symbols]

[0095] 10 Liquid container 20 Liquid storage bag 30 Connection port

Claims

1. A liquid container for supplying liquid to a liquid ejection device that ejects liquid, a liquid containing bag for containing a liquid; a connection port provided on the liquid containing bag for connecting the liquid containing bag to the liquid discharge device; Equipped with A liquid container characterized in that the length of the liquid containing bag in the extension direction of the connection port portion, or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction, decreases as the liquid contained in the liquid containing bag decreases.

2. 2. The liquid container according to claim 1, wherein the liquid containing bag is rolled up as the amount of liquid contained in the liquid containing bag decreases, thereby reducing the length of the liquid containing bag in the extension direction or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction.

3. The liquid container according to claim 2 , wherein the liquid containing bag is rolled up so that the length of the liquid containing bag in the stretching direction is reduced.

4. a biasing member that applies a biasing force to roll up the liquid containing bag; 4. The liquid container according to claim 2, wherein the liquid containing bag is rolled up by the biasing force of the biasing member as the liquid contained in the liquid containing bag decreases.

5. The liquid container according to claim 4 , wherein the biasing member is formed using a wire and attached to the liquid containing bag.

6. The liquid containing bag is a first sheet member formed in a sheet shape; a second sheet member formed in a sheet shape and overlapping the first sheet member; Equipped with A liquid is contained between the first sheet member and the second sheet member, the linear expansion coefficient of the material of the first sheet member and the linear expansion coefficient of the material of the second sheet member are different from each other, 4. The liquid container according to claim 2 or 3, wherein as the liquid contained in the liquid containing bag decreases, the liquid containing bag is rolled up by a force generated based on the difference between the linear expansion coefficient of the material of the first sheet member and the linear expansion coefficient of the material of the second sheet member.

7. The liquid containing bag has a curled habit, 4. The liquid container according to claim 2, wherein the liquid containing bag is curled due to the curling tendency of the liquid containing bag as the amount of liquid contained in the liquid containing bag decreases.

8. 2. The liquid container according to claim 1, wherein the liquid containing bag is folded as the amount of liquid contained in the liquid containing bag decreases, thereby reducing the length of the liquid containing bag in the extension direction or the length of the liquid containing bag in a direction intersecting the extension direction and the vertical direction.

9. the liquid containing bag has a crease formed thereon for folding the liquid containing bag, The liquid container according to claim 8 , wherein the liquid containing bag is folded along the crease formed on the fold line as the liquid contained in the liquid containing bag decreases.

10. The liquid container according to claim 9 , wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in the extension direction.

11. The liquid container according to claim 10 , wherein the liquid containing bag has a plurality of the folds arranged along the stretching direction.

12. The liquid container according to claim 11 , wherein the length of the portion between the plurality of folds in the liquid containing bag increases as it approaches the connection port.

13. The liquid containing bag is a first sheet member formed in a sheet shape; a second sheet member formed in a sheet shape and overlapping the first sheet member; Equipped with A liquid is contained between the first sheet member and the second sheet member, the first sheet member has a first fold line with a first crease for folding the liquid containing bag; the second sheet member has a second crease disposed opposite the first crease and having a second crease symmetrical to the first crease; 9. The liquid container according to claim 8, wherein the liquid containing bag is folded along the first crease on the first fold and the second crease on the second fold as the liquid contained in the liquid containing bag decreases.

14. The liquid container according to claim 13 , wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in the extension direction.

15. the first sheet member has a plurality of first folds arranged along the stretching direction, The liquid container according to claim 14 , wherein the second sheet member has a plurality of the second folds arranged along the extension direction.

16. The liquid container according to claim 9 , wherein the liquid containing bag is folded to reduce the length of the liquid containing bag in a direction intersecting the stretching direction and the vertical direction.

17. The liquid container according to claim 16 , wherein the liquid containing bag has a plurality of the folds arranged along a direction intersecting the stretching direction and the vertical direction.

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