JP2009208818A - Liquid container and method of discharging from the container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid container capable of discharging liquid disliking contact with air and contained in the container without causing air to enter the container as much as possible, and a method of discharging the liquid from the container. <P>SOLUTION: A first inner container 1 and a second inner container 2 each formed in a bag shape and capable of being folded are formed of a polyethylene sheet which is a flexible resin member. The first inner container 1 and the second inner container 2 are accommodated in an outer container 3 by fully containing water-soluble paint P in the first inner container 1, contracting the second inner container 2, and making the first inner container 1 contact with the second inner container 2. Then, as the water-soluble paint P is dispensed, the volume thereof inside the first inner container 1 reduces. However, at this time, the first inner container 1 is contracted by the pressure of air A supplied into the second inner container 2. Therefore, the capacity of the first inner container 1 is reduced, and thus, the intrusion of the air into the first inner container 1 can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a storage container that stores liquid that dislikes contact with air and discharges the liquid without allowing air to enter the container as much as possible, and a method for discharging the same.

  For example, when transporting or storing a water-based paint, the water-based paint is contained in a predetermined container. As a container that can contain a water-based paint, for example, a container disclosed in Patent Document 1 exists. When the water-based paint is accommodated in the container and the liquid level of the water-based paint is in contact with air, the portion is cured and a film called “skinning” is formed. The use of a water-based paint with a skin coating makes the coating thickness non-uniform, making it difficult to perform accurate painting operations, slowing the drying of the coating, The problem that the road is clogged with paint is likely to occur.

  In order to avoid the above problems, there is a technique disclosed in Patent Document 2. In this technique, the shielding member built in the container is brought into contact with the liquid level of the aqueous paint, and the shielding member is lowered following the decrease of the aqueous paint accompanying use. However, since this technique requires a certain strength for the container and the shielding member, it is difficult to fold the container to make it smaller. As a result, a storage space equivalent to the size of the container is required regardless of the amount of paint. Moreover, since two members, a container and a shielding member, are required, the manufacturing cost increases.

Moreover, in the technique disclosed in Patent Document 3, the liquid level of the aqueous paint is prevented from coming into contact with air by filling the container in which the aqueous paint is accommodated with an inert gas. In this technique, an inert gas must always be prepared.
JP-A-8-48364 JP 2001-301832 A JP-A-5-4681

  In view of the circumstances described above, the present invention provides a storage container that can discharge a liquid that dislikes contact with air stored in the container without allowing air to enter the container as much as possible, and a method for discharging the liquid. The issue is to provide.

Means and effects for solving the problems

The first invention for solving the above-described problems is
A container that contains a liquid that dislikes contact with air and that discharges the liquid without allowing it to enter the container as much as possible.
A first container into which the liquid is supplied and discharged in a flexible bag shape whose volume is freely changed;
A second container in which a pressing fluid for pushing out the liquid contained in the first container is pushed out from the first container;
The second container in a small volume state is brought into contact with the first container in which the liquid is contained and is in a large volume state, and the containers are moved in directions other than the directions in which the first and second containers are pressed against each other. An outer container for suppressing bulging,
Of the first and second containers accommodated in the outer container, when the liquid is discharged from the first container in which the liquid that dislikes contact with air is accommodated, the second container in a small volume state is By supplying a pressing fluid to bulge the second container and compressing the first container with the bulging pressure, the air is prevented from entering the first container as much as possible. The liquid is discharged from the first container.

  The liquid container according to the first invention is configured as described above, and a bag-like first container whose volume is freely changed, and a pressing fluid that pushes out the liquid contained in the first container are supplied and discharged. Two containers of the second container are accommodated in the outer container. And the 1st container in which the liquid which dislikes contact with air is swelled by being pressed by the pressurization fluid supplied to the 2nd container, and the liquid level of the liquid does not contact air as much as possible So that the liquid is discharged. That is, the liquid is stored in the first container, the pressing fluid is supplied to the second container and they are stored in the outer container, and contact between the liquid discharged from the first container and air is avoided. Is done. This prevents “skinning” from occurring on the surface of the liquid. Further, by adopting the above-described configuration, the liquid can be transported and stored without causing air to enter the first container as much as possible (in other words, without causing skinning of the liquid). You can also.

  The first and second containers are in a cuboid shape in an expanded state, and are folded by a predetermined fold line and contracted. The fold line is formed on a diagonal line of a pair of faces opposed to each container and a ridge line connected to the diagonal line.

  The first and second containers are contracted by being folded along a fold line. That is, since the fold line is formed in the container, the container can be reliably expanded and contracted. Moreover, since it becomes a cube shape in the bulging state, the conveyance and storage of the container which accommodated the liquid become easy. Further, by folding the container along the folding line, it is easy to transport and store only the container.

  The first and second containers are each formed with a recessed portion in the folded state, and the first and second containers are provided with the liquid in the recessed portion of one of the folded containers and the other is in a large volume state. Are accommodated in the outer container. And the said 1st and 2nd container is fitted in the form which overlaps those folding lines.

  Thereby, in the state which fitted the 1st and 2nd container, those magnitude | sizes become compact. As a result, the size of the outer container can be made compact.

  The first and second containers can be made of a sheet-like soft resin material.

  Thereby, the 1st and 2nd container can be made lightweight.

The first and second containers are provided with a mouth for supplying and discharging the pressing fluid,
The outer container is provided with a hole for fitting the mouth in a state where the first and second containers are accommodated,
When the first and second containers are accommodated in the outer container, their mouths can be fitted into the holes of the outer container so as to protrude outward from the outer wall surface of the outer container.

  The first and second containers accommodated in the outer container are accommodated by fitting their mouths into the holes of the outer container. Thereby, the possibility that the first and second containers are displaced inside the outer container is reduced, and the second container is swelled by the pressing fluid supplied to and discharged from the second container, and the first container is reliably compressed. be able to.

  An opening / closing valve that allows / blocks the entry / exit of the pressing fluid may be attached to the mouths of the first and second containers accommodated in the outer container.

  By operating the on-off valve, it is possible to allow or block the entrance and exit of the liquid stored in the first container and the pressing fluid supplied to the second container. Thereby, it is reliably prevented that air enters the first container, and the liquid can be transported and stored without bringing air into contact with the liquid surface.

And the 2nd invention for solving the above-mentioned subject is:
A container that contains a liquid that dislikes contact with air and that discharges the liquid without allowing it to enter the container as much as possible.
A first chamber in which liquid that dislikes contact with air is supplied and discharged, and a second chamber in which pressure fluid that presses the liquid stored in the first chamber is supplied and discharged are provided. The two chambers are separated by a diaphragm that compresses the other chamber by supplying the pressing fluid to one chamber and reduces its internal volume,
When the liquid stored in the first chamber is discharged, the pressing fluid is supplied to the second chamber in a small volume state, and the diaphragm is expanded so as to press the first chamber. The volume of the first chamber is reduced, and the liquid is discharged from the first chamber so that air does not enter the first chamber as much as possible.

  And the volume of the said 1st chamber and the 2nd chamber provided with the flexible diaphragm in the inside with the flexible diaphragm inside can change freely, and the said 1st chamber and the 2nd chamber When the volume of any one of these is maximized, it can be folded so that the other volume is minimized.

  Moreover, you may provide the outer side container which can be accommodated by making the clearance gap with the outer peripheral surface of the said 1st and 2nd chamber small.

  In the liquid container according to the second aspect of the invention, the inside of one container is separated into a first chamber and a second chamber by a diaphragm. The liquid stored in the first chamber is pressed against the diaphragm swelled by the pressing fluid supplied to the second chamber. For this reason, when discharging the liquid accommodated in the first chamber, it is possible to prevent the air from entering the first chamber as much as possible. In the case of the present invention, only one container is required. Furthermore, there is an advantage that there is no need for an outer container.

Furthermore, the third invention for solving the above-mentioned problem is
When discharging liquid that dislikes contact with air contained in a container, the method discharges the air without entering the container as much as possible,
The liquid is stored in a flexible bag-like first container whose volume is freely changed, and a second container to which a pressing fluid for pushing out the liquid in the first container is supplied and discharged is brought into contact with the first container. In an outer container,
While supplying the pressing fluid to the second container, the outer container suppresses the bulging to a direction other than the direction in which the first and second containers are pressed against each other,
The second container in a small volume state is swelled with the pressing fluid, and the first container is squeezed so that air is discharged to the first container as much as possible when the liquid is discharged from the first container. It is characterized by preventing entry.

  Examples of the present invention will be described. FIG. 1 is a side sectional view of the storage container 101 of the first embodiment, FIG. 2 is a perspective view of the bulging state of the first inner container 1, and FIG. 3 is a perspective view of the folded state.

  Initially, the storage container 101 of 1st Example is demonstrated. As shown in FIG. 1, the storage container 101 of the first embodiment includes a first inner container 1 (first container) that stores a liquid that dislikes contact with air (in this embodiment, a water-based paint P). The second inner container 2 (second container) to which air, water, etc. (pressing fluid, in this embodiment, air A) are supplied and discharged, and the first and second inner containers 1 and 2 are accommodated. The outer container 3 is provided. At predetermined positions of the first and second inner containers 1 and 2, mouth parts 4 and 5 for supplying and discharging the water-based paint P or air A to the inner containers 1 and 2 are provided. Each open / close valve 6 is attached to 4 and 5. The opening / closing valve 6 can communicate or block the inside and outside of the first and second inner containers 1 and 2 by rotating the handle 6a. An outlet of the opening / closing valve 6 attached to the first inner container 1 is connected to a coating gun 8 via a paint hose 7. The outlet of the opening / closing valve 6 attached to the mouth portion 5 of the second inner container 3 is connected to the air compressor 11 via the air hose 9. The painting gun 8 is connected to another air compressor 13 via another air hose 12. When the trigger (trigger 8a) of the coating gun 8 is operated in the open state of the on-off valve 6 (that is, the state where the first inner container 1 and the paint hose 7 are in communication), air is supplied from the air compressor 13 via the air hose 12. Supplied. As a result, the inside of the coating gun 8 becomes negative pressure, and the water-based paint P in the first inner container 1 is sucked up through the paint hose 7 and sprayed from the paint gun 8. In FIG. 1, reference numeral 14 denotes a suction hose for sucking the water-based paint P.

  The first and second inner containers 1 and 2 will be described. Here, since the first and second inner containers 1 and 2 have the same shape, only the first inner container 1 will be described in this specification. As shown in FIG. 2, the first inner container 1 of the present embodiment is formed by bending a flexible resin sheet (for example, a polyethylene sheet), and is in a bulging state (a state in which the water-based paint P is fully accommodated, a large size). It becomes a substantially cubic shape in the volume state). And the opening | mouth part 4 mentioned above is provided in the upper surface part 15 of the 1st inner side container 1 when it swells and becomes a cube shape. The peripheral part of the mouth part 4 is recessed in a concave shape, and a ring-shaped recessed part 16 is formed. When the pressure in the first inner container 1 rises for some reason, the depression 16 can be swelled to escape the pressure rise.

  And the upper side ridgeline 18 which joins the upper surface part 15 and the front part 17 of the 1st inner side container 1 in the bulging state (state used as the cube shape), the back part 19 (surface which opposes the front part 17), and a bottom face The lower ridge line 21 that joins the portion 20 (the surface facing the upper surface portion 15) and the diagonal line 23 of the pair of side surface portions 22 that are arranged to face each other are fold lines for folding the first inner container 1. That is, with the mouth portion 4 of the first inner container 1 opened, a portion (front portion 17) formed below each folding line (upper and lower ridge lines 18, 21 and a pair of diagonal lines 23) as a reference. , A portion formed by an obliquely lower portion of the bottom surface portion 20 and the pair of side surface portions 22. Hereinafter, a portion (the upper surface portion 15) described above is referred to as “an oblique lower half portion 24”. , A portion formed by an obliquely upper portion of the back surface portion 19 and the pair of side surface portions 22 (hereinafter referred to as “oblique upper half portion 25”). It is possible to fold the first inner container 1 while discharging air from the mouth 4. Then, as shown in FIG. 3, the recessed portion 26 is formed in the folded first inner container 1. At this time, the oblique lower half 24 and the oblique upper half 25 of the folded first inner container 1 are arranged in an overlapping state in which their outer wall surfaces are brought close to each other. And as FIG. 4 shows, the diagonal lower half part 24 of the 1st inner side container 1 of the folded state is fitted to this recessed part 26 (in FIG. 4, the recessed part 26 of the 2nd inner side container 2), Can be overlapped. FIG. 5 shows the first and second inner containers 1 and 2 in an overlapped state. Since the plurality of first and / or second inner containers 1 and 2 can be overlapped, a space for storing and transporting them can be reduced. In FIG. 2, reference numeral 27 denotes a cap for closing the mouth portion 4.

  Next, the outer container 3 will be described. As shown in FIG. 5, the outer container 3 of the present embodiment is made of a material that is difficult to deform (for example, a metal plate such as stainless steel) and has a bottomed rectangular tube-shaped outer container body 28 that is open at the top. And a lid 29 that is hinged to the upper edge of the outer container body 28 so as to be rotatable and can close the opening. The outer container body 28 can accommodate the first and second inner containers 1 and 2 in an overlapping state. When the first and second inner containers 1, 2 are accommodated in the outer container body 3 and the lid body 29 is closed, the first and second inner containers 1, 2, the outer container body 28, and the lid body. The gap between the inner wall surface 29 is slight.

  A hole 31 for projecting the mouth 5 of the second inner container 2 accommodated in the outer container main body 28 is provided in the front portion of the outer container main body 28. The lid 29 is provided with a hole 32 for projecting the mouth 4 of the first inner container 1 accommodated in the outer container body 28. The first and second inner containers 1 and 2 accommodated in the outer container body 28 in an overlapped state have their mouths 4 and 5 through the corresponding holes 31 and 32 with the lid 29 closed. It is arranged to protrude. Thereby, the 1st and 2nd inner containers 1 and 2 accommodated in the outer container 3 do not shift.

  The operation when the painting operation is performed with the water-based paint P using the container 101 of the first embodiment will be described. As shown in FIG. 4, the oblique lower half 24 of the bulging first inner container 1 is fitted into the recess 26 of the second inner container 2 folded along the fold line. The first and second inner containers 1 and 2 in the overlapping state are approximately the size of one of them. As shown in FIG. 5, the overlapped first and second inner containers 1 and 2 are accommodated in the outer container body 28 and the lid 29 is closed. The mouth part 4 of the first inner container 1 projects from the hole part 32 of the lid 29, and the mouth part 5 of the second inner container 2 projects from the hole part 31 on the front part of the outer container body 28. Thereby, it is suppressed that the 1st and 2nd inner containers 1 and 2 shift in the outer container 3.

  The first inner container 1 is supplied with water-based paint P and stored. In order to prevent skinning, it is desirable to store the water-based paint P in the first inner container 1 in a full state (large volume state). Further, by opening the mouth portion 5 of the second inner container 2, the air in the second inner container 2 is released, and the second inner container 2 is in a contracted state.

  The opening / closing valve 6 is attached to the mouth portions 4 and 5 of the first and second inner containers 1 and 2. By operating the handle 6a of each open / close valve 6, the outlet of the open / close valve 6 and the inside of the first and second inner containers 1, 2 are communicated.

  Subsequently, the outlet of the opening / closing valve 6 of the first inner container 1 and the paint supply port of the paint gun 8 are connected by the paint hose 7. The air supply port of the painting gun 8 is connected to an air compressor 13 by an air hose 12. Further, the outlet of the opening / closing valve 6 of the second inner container 2 is connected to the air compressor 11 by an air hose 9. The air compressors 11 and 13 may be combined into one to supply air from either of the air compressors 11 and 13 to both the second inner container 2 and the coating gun 8.

  The air compressors 11 and 13 are operated, the trigger 8a of the painting gun 8 is pulled, and the painting work is started. The water-based paint P is supplied to the paint gun 8 via the paint hose 7, and the water-based paint P is sprayed from the nozzle of the paint gun 8.

  As the painting operation is performed, the water-based paint P in the first inner container 1 decreases. In the case of a conventional container, air enters the first inner container 1 as the water-based paint P decreases, and the liquid level of the water-based paint P comes into contact with air. Thereby, there exists a possibility that skinning may be formed in the liquid level of the water-based coating material P. FIG. However, in the case of the storage container 101 of the present embodiment, the air A is supplied to the second inner container 2, and the second inner container 2 is gradually expanded by the pressure. Hereinafter, the air as the pressing fluid supplied to the second inner container 2 is referred to as “air A”. That is, as shown in FIG. 6, the oblique upper half 25 that has been pushed into the recess 26 in the second inner container 2 gradually bulges, compressing the oblique lower half 24 of the first inner container 1, (1) The inner container 1 is contracted so as to be folded. At this time, the outer container 3 causes the first and second inner containers 1 and 2 to bulge in directions other than the direction in which they are pressed against each other (the parts other than the oblique lower half 24 of the first inner container 1 bulge) , The portion other than the oblique upper half portion 25 of the second inner container 2 bulges out). Thereby, even if the water-based paint P decreases, the volume of the first inner container 1 decreases accordingly, and the first inner container 1 contracts while the water-based paint P is filled inside. As a result, there is no possibility that air enters the first inner container 1.

  When the work is finished with the water-based paint P remaining in the first inner container 1, the handle 6a of the opening / closing valve 6 attached to the mouths 4, 5 of the first and second inner containers 1, 2 is closed. The inside and outside of the first and second inner containers 1 and 2 are shut off. Thereby, the pressure of the air A in the 2nd inner side container 2 is maintained. As a result, the state in which the water-based paint P is full in the first inner container 1 is maintained, and there is no possibility that air enters the first inner container 1.

  Next, the storage container 102 of the second embodiment will be described. The storage container 101 of the first embodiment is configured to discharge the stored water-based paint P without causing air to enter the first inner container 1 by the air A supplied to the second inner container 2. On the other hand, in the storage container 102 of 2nd Example, it is a case of the one inner side container 33, as FIG. 7 shows. The inside of the inner container 33 is divided into a first chamber 35 and a second chamber 36 by a flexible sheet-like diaphragm 34. When the water-based paint P is fully stored in the first chamber 35, the air in the second chamber 36 is expelled, and the diaphragm 34 is disposed in a close contact state with the second chamber 36. Thereby, the second chamber 36 is in a small volume state.

  As shown in FIG. 8, as the water-based paint P decreases, air A as a pressing fluid is supplied to the second chamber 36. As a result, the second chamber 36 swells and the diaphragm 34 presses the first chamber 35 with the pressure of the air A. Even if the water-based paint P in the first chamber 35 decreases, the volume of the first chamber 35 decreases due to the expansion of the second chamber 36, so that air can be prevented from entering the first chamber 35, The state in which the water-based paint P is full is maintained, and the risk of the liquid surface coming into contact with air is reduced.

  In the case of the storage container 102 of the second embodiment, only the arrangement of the diaphragm 34 changes and the outer wall of the storage container 33 does not change, so the outer container 3 may be omitted.

  In each of the above-described embodiments, the liquid stored in the first chamber 35 of the first inner container 1 or the inner container 33 is the aqueous paint P. However, liquids other than the water-based paint P that dislike contact with air, such as beverages and chemicals, may be used. Moreover, although the pressing fluid supplied to the 2nd chamber 36 of the 2nd inner container 2 or the inner container 33 is the air A, fluids other than the air A, for example, water, may be sufficient.

  In the storage containers 101 and 102 according to the present invention, the first and second inner containers 1 and 2 or the first and second chambers 35 and 36 of the inner container 33 have the same shape (same volume) only in different directions. is there. For this reason, for example, after the water-based paint P is stored in the first inner container 1 and the air A is supplied to the second inner container 2 to perform the painting operation, the first and second inner containers 1 and 2 are replaced. Then, another color water-based paint P can be accommodated in the second inner container 2, and air A can be supplied to the first inner container 1 to perform the painting operation. Thereby, since it can work | work continuously, without wash | cleaning the 1st and 2nd inner containers 1 and 2, coating efficiency increases. Further, after the painting operation is completed, the first and second inner containers 1 and 2 can be discarded as they are.

  The storage containers 101 and 102 according to the present invention have a form in which the first and second inner containers 1 and 2 or the inner container 33 are stored in the outer container 3, and the first and second inner containers 1 and 2 or The inner container 33 and the outer container 3 can be separated. However, the first and second inner containers 1, 2 or the inner container 33 may be attached to the outer container 3 (bag in carton).

  Further, in the storage container 101 of the first embodiment, the first and second inner containers 1 and 2 may be overlapped, and then the fold lines may be joined by means such as welding. Thereby, the 1st and 2nd inner side containers 1 and 2 can be united, and storage and conveyance become still easier.

  The water-based paint P includes a resin (particles that form a coating film with an acrylic resin or the like), a pigment (particles that give color), and a solvent (water). Since the resin and pigment in the water-based paint P are heavy, they tend to settle on the bottom of the first inner container 1. If coating is performed in this state, the coating film may have uneven thickness and color. In order to prevent this, it is desirable to stir the aqueous paint P accommodated in the first inner container 1.

  The agitator 201 shown in FIGS. 9A and 9B continuously rotates (rotates) a twisted metal rod 37 submerged in the aqueous paint P accommodated in the first inner container 1, thereby producing an aqueous paint. P is agitated. A spiral groove 38 is provided on the outer peripheral surface of the twisted metal rod 37. Further, a float 39 for floating the twisted metal rod 37 in an upright state in the water-based paint P is attached to the upper end portion. An electromagnetic plate 41 is installed at the bottom of the first inner container 1. The electromagnetic plate 41 is an assembly of a plurality of electromagnets 42 having different polarities. When the electromagnetic plate 41 is energized, the electromagnets 42 have different polarities in order. As a result, the twisted metal rod 37 is attracted to or repels the electromagnetic plate 41 and thus rotates (autorotates). As a result, the water-based paint P is agitated.

  Since the stirring device 201 is configured to rotate the twisted metal rod 37 submerged in the water-based paint P, it is not necessary to remove the cap 27 for stirring. For this reason, even if the first inner container 1 is filled with the water-based paint P, it can be stirred without spilling the water-based paint P.

  Further, in the stirring device 202 shown in FIG. 10, a plurality of springs 44 are attached to the ceiling of the frame 43 provided in a gate shape, and the first inner container 1 is attached in a suspended state by the springs 44. ing. The aqueous paint P accommodated in the first inner container 1 vibrates in the height direction by extending and contracting each spring 44. Thereby, the water-based paint P is stirred. Since this stirring device 202 utilizes the expansion and contraction of the spring 44, there is an advantage that a power source is unnecessary.

It is side surface sectional drawing of the storage container 101 of 1st Example. FIG. 3 is a perspective view of a bulging state of a first inner container 1. It is a perspective view of the folded state similarly. It is effect | action explanatory drawing of the state which fits the recessed part 26 of the 2nd inner side container 2 of the folded-up 2nd inner side container 1 in the bulging state. FIG. 6 is an operation explanatory diagram of a state in which the first and second inner containers 1 and 2 in a fitted state are accommodated in the outer container 3. It is operation | movement explanatory drawing of the storage container 101 of 1st Example. It is side surface sectional drawing of the storage container 102 of 2nd Example. It is action | operation explanatory drawing of the storage container 102 of 2nd Example. (A) is front sectional drawing of the stirring apparatus 201, (b) is a top view similarly. It is front sectional drawing of the stirring apparatus 202. FIG.

Explanation of symbols

101, 102 container 1 first inner container (first container)
2 Second inner container (second container)
3 Outer container 4, 5 Port 6 Open / close valve 18 Upper edge line (folding line)
21 Lower ridgeline (folding line)
23 Diagonal line (folding line)
24 Diagonal lower half (convex part)
26 Recess 31, 32 Hole 33 Inner container (container)
34 Diaphragm 35 First chamber 36 Second chamber A Air (pressing fluid)
P Water-based paint (liquid)

Claims (12)

A container that contains a liquid that dislikes contact with air and that discharges the liquid without allowing it to enter the container as much as possible.
A first container into which the liquid is supplied and discharged in a flexible bag shape whose volume is freely changed;
A second container in which a pressing fluid for pushing out the liquid contained in the first container is pushed out from the first container;
The second container in the small volume state is brought into contact with the first container in which the liquid is accommodated and is in a large volume state, and each container is moved in a direction other than the direction in which the first and second containers are pressed against each other. An outer container for suppressing bulging,
Of the first and second containers accommodated in the outer container, when the liquid is discharged from the first container that accommodates the liquid that dislikes contact with air, the second container in a small volume state is By supplying a pressing fluid to bulge the second container and compressing the first container with the bulging pressure, the air is prevented from entering the first container as much as possible. A liquid container, wherein the liquid is discharged from the first container.   2. The liquid container according to claim 1, wherein the first and second containers have a cubic shape in a bulged state, and are folded and contracted by a predetermined folding line.   The container for liquid according to claim 2, wherein the fold line is formed on a diagonal line of a pair of faces opposed to each other in each container and a ridge line connected to the diagonal line. The first and second containers are formed with a recess in the folded state,
The first and second containers are accommodated in the outer container by fitting the other container in a large volume state when the liquid is supplied into the recess of the one container in the folded state. The liquid container according to claim 2, wherein the container is a liquid container.   5. The liquid container according to claim 4, wherein the first and second containers are fitted so that their folding lines overlap each other.   The liquid container according to any one of claims 1 to 5, wherein the first and second containers are made of a sheet-like soft resin material. The first and second containers are provided with a mouth for supplying and discharging the pressing fluid,
The outer container is provided with a hole for fitting the mouth in a state where the first and second containers are accommodated,
When the first and second containers are accommodated in the outer container, their mouths are fitted into the holes of the outer container and protrude outward from the outer wall surface of the outer container. The liquid container according to any one of claims 1 to 6.   8. An opening / closing valve that allows / blocks entry / exit of the pressing fluid is attached to the mouths of the first and second containers accommodated in the outer container. The liquid container according to Item 1. A container that contains a liquid that dislikes contact with air and that discharges the liquid without allowing it to enter the container as much as possible.
A first chamber in which liquid that dislikes contact with air is supplied and discharged, and a second chamber in which pressure fluid that presses the liquid stored in the first chamber is supplied and discharged are provided. The two chambers are separated by a diaphragm that compresses the other chamber by supplying the pressing fluid to one chamber and reduces its internal volume,
When the liquid stored in the first chamber is discharged, the pressing fluid is supplied to the second chamber in a small volume state, and the diaphragm is expanded so as to press the first chamber. A liquid container, wherein the liquid is discharged from the first chamber by reducing the volume of the first chamber so that air does not enter the first chamber as much as possible.   The volume of the first chamber and the second chamber, which is formed in a flexible bag shape as a whole and has a flexible diaphragm inside thereof, can be freely changed, and any of the first chamber and the second chamber 10. The container for liquid that dislikes contact with air according to claim 9, wherein the container is foldable so that the volume of the other is minimized when the volume of the other is maximized.   11. The container for liquids that dislikes contact with air according to claim 9 or 10, further comprising an outer container that can be accommodated with a small gap between the first and second chambers and outer peripheral surfaces. When discharging liquid that dislikes contact with air contained in a container, the method discharges the air without entering the container as much as possible,
The liquid is stored in a flexible bag-like first container whose volume is freely changed, and a second container to which a pressing fluid for pushing out the liquid in the first container is supplied and discharged is brought into contact with the first container. In an outer container,
While supplying the pressing fluid to the second container, the outer container suppresses the bulging to a direction other than the direction in which the first and second containers are pressed against each other,
The second container in a small volume state is swelled with the pressing fluid, and the first container is squeezed so that air is discharged to the first container as much as possible when the liquid is discharged from the first container. A method for discharging a liquid, characterized in that the liquid is prevented from entering.

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