Liquid storage bag and method of manufacturing liquid storage bag

Abstract

To provide a liquid storage bag and method of manufacturing a liquid storage bag allowing for providing a liquid storage bag having high light shield-ability with a simple structure.SOLUTION: A liquid storage bag 21 comprises a bag body 22 and a supply part 23. The bag body 22 is made in a bag form by joining a film 31. The supply part 23 is structured to supply a liquid filled within the bag body 22. A film 31 forming the bag body 22 is of a light-shielding film. The liquid is of a photosensitive type. The bag body 22 has one or more fold ends 25 and a joined end 26. The one or more fold ends 25 are formed by folding one film 31 such that peripheral edges are superposed together. The joined end 26 is formed by joining the film 31 together at the peripheral edge where the film 31 is superposed together. At least part of the joined end 26 is joined in a form that two end faces of two film portions 31A, 31B superposed at the peripheral edge are covered by a surface of at least one of the two film portions 31A, 31B.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a liquid containing bag for containing a liquid and a method for manufacturing the liquid containing bag. [Background technology]

[0002] For example, Patent Document 1 discloses an ink pack, which is an example of a liquid storage bag that stores ink as an example of a liquid. The ink pack includes an ink container, which is an example of a bag body that stores ink, and an ink supply port, which is an example of a supply port provided in the ink container. When the ink pack is attached to a printing device, ink is supplied from the ink supply port to a recording unit in the printing device. The ink container is formed from a light-blocking laminated film. The laminated film has a laminated structure in which a resin layer and a metal layer are stacked.

[0003] In the ink pack, the second resin layer, the metal layer, and the protective layer of the upper film on the surface portion extend from the base layer to form an extension portion. Because the metal layer has light-blocking properties, this extension portion is folded back and attached to the surface of the lower film on the side portion. This allows the base layer exposed at the end surface of the joint to be covered by the light-blocking metal layer, preventing ultraviolet light from outside from reaching the ink inside the ink pack through the base layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-97620 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while conventional liquid containing bags provide light-blocking properties, they require a processing step to form an extension portion at the end of the film, extending the second resin layer, metal layer, and protective layer from the base layer. Furthermore, when joining two films, a process is required to fold back the extension portion of the upper film and attach it to the surface of the lower film. Patent Document 1 also discloses a configuration in which an ultraviolet-blocking resin is applied to the end surface of the base layer, or a configuration in which the end surface of the base layer is covered with a tape-like sealing piece. However, these configurations also require processing to form an extension portion on the film, or require processes such as applying a resin or attaching a tape-like sealing piece separately from the film. Furthermore, if the extension portion covering the end surface of the base layer or the tape-like sealing piece exposes the end surface of a resin layer, such as an intermediate resin layer, there is a risk that a small amount of light may reach the liquid in the liquid containing bag through the extension portion or the resin layer exposed at the end surface of the tape-like sealing piece. Therefore, there is room for improvement in light-blocking properties, and the configuration also has the problem of complicating the manufacturing process of liquid containing bags. For this reason, there is a demand for a liquid containing bag that has a simple structure and provides high light blocking properties. [Means for solving the problem]

[0006] A liquid containing bag that solves the above problem is a liquid containing bag that includes a bag body formed by joining films together and a supply section that can supply the liquid sealed inside the bag body, wherein the film that forms the bag body is a light-blocking film and the liquid is a photosensitive liquid, and the bag body has one or more folded ends formed by folding one sheet of the film so that its peripheral edges overlap, and a joined end formed by joining the films to each other or to another film at the overlapping peripheral edges, and at least a portion of the joined end is joined in a manner that covers the two end faces of two film sections that overlap at the peripheral edges with the surface of at least one of the two film sections.

[0007] A method for manufacturing a liquid-containing bag that solves the above problem is a method for manufacturing a liquid-containing bag that includes a bag body formed by joining films together to form a bag shape, and a supply section that can supply the liquid sealed inside the bag body, wherein the film that forms the bag body is a light-blocking film, and the liquid is a photosensitive liquid, and the method comprises: (a) forming one or more folded ends by folding one sheet of the film so that the peripheral edges overlap; and (b) forming a joined end by joining the overlapping peripheral edges, wherein in (b), a portion of the joined end is formed by joining two end faces of two film sections that overlap at the peripheral edges in a form that covers the two end faces with the surface of at least one of the film sections. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a liquid ejection apparatus according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the liquid containing bag. [Figure 3] FIG. 3 is a schematic diagram showing the joining end portion of the liquid containing bag. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the joining end portion of the liquid containing bag. [Figure 5] FIG. 5 is a schematic cross-sectional view showing an end portion of the liquid containing bag. [Figure 6] FIG. 6 is a schematic cross-sectional view illustrating the function of the liquid containing bag. [Figure 7] FIG. 7 is a schematic diagram showing the manufacturing process of the liquid containing bag. [Figure 8] FIG. 8 is a schematic diagram showing the manufacturing process of the liquid containing bag. [Figure 9] FIG. 9 is a schematic diagram showing the end of the liquid containing bag before the joining end is formed. [Figure 10] FIG. 10 is a schematic diagram showing the process of forming the joining end portion. [Figure 11] FIG. 11 is a schematic cross-sectional view showing an end portion of a liquid containing bag in a modified example. [Figure 12] FIG. 12 is a perspective view showing a liquid containing bag according to a modified example. [Figure 13]FIG. 13 is a schematic cross-sectional view showing a joint end portion of a modified example. [Figure 14] FIG. 14 is a schematic cross-sectional view showing a joint end portion of a modified example different from that shown in FIG. [Figure 15] FIG. 15 is a schematic cross-sectional view showing a joint end portion of a modified example different from that shown in FIG. [Figure 16] FIG. 16 is a schematic cross-sectional view showing a joint end portion of a modified example different from that shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a liquid containing bag will be described below with reference to the drawings. The liquid containing bag is used as a liquid supply source in a liquid ejection device. In the drawings, the liquid ejection device 11 is placed on a horizontal plane, with the direction of gravity indicated by the Z axis and directions along the horizontal plane indicated by the X and Y axes. The X, Y, and Z axes are perpendicular to one another. The Y direction, which is parallel to the Y axis, is the transport direction in which the medium 15 is transported. The X direction, which is parallel to the X axis, is the width direction that intersects with the transport direction of the medium 15.

[0010] <Configuration of liquid ejection device 11> First, the configuration of a liquid ejection device 11 will be described with reference to FIG. 1. As shown in FIG. 1, the liquid ejection device 11 ejects liquid supplied from a liquid containing bag 21. The liquid ejection device 11 is, for example, a printing device that ejects ink as an example of a liquid onto a medium 15 such as paper. The liquid ejection device 11 is, for example, an inkjet printer. The liquid ejection device 11 includes a liquid ejection head 13 that can eject liquid. The liquid ejection device 11 may also include a support unit 14 that can support the medium 15. The liquid ejection device 11 may also include a housing 12 that houses the liquid ejection head 13 and the support unit 14. The liquid ejection device 11 prints characters or images onto a medium 15 such as paper by ejecting ink droplets from the liquid ejection head 13.

[0011] The liquid containing bag 21 is used by being attached to the liquid ejection device 11. The liquid containing bag 21 contains the liquid to be supplied to the liquid ejection device 11. More specifically, the liquid containing bag 21 contains the liquid to be supplied to the liquid ejection head 13. The liquid containing bag 21 of this embodiment has a photosensitive liquid sealed therein.

[0012] The support section 14 supports the medium 15 being transported. The liquid ejection head 13 has nozzles 16. The liquid ejection head 13 is capable of ejecting liquid. The liquid ejection head 13 ejects liquid from the nozzles 16 onto the medium 15 supported by the support section 14. The liquid ejection head 13 may be a serial type that ejects liquid while moving to print. The liquid ejection head 13 may also be a line type that is provided elongated in the width direction of the medium 15 and ejects liquid onto the medium 15 being transported to print.

[0013] The liquid ejection device 11 may include a supply flow path 17, supply needles 18, a tray 19, and a mounting portion 20. The supply flow path 17 supplies liquid to the liquid ejection head 13 from a liquid containing bag 21 that contains the liquid.

[0014] The supply needle 18 is provided at the upstream end of the supply flow path 17. The tray 19 is detachably attached to the attachment portion 20. The tray 19 supports the liquid containing bag 21. That is, the liquid containing bag 21 is placed on the tray 19. When the tray 19 is attached to the attachment portion 20 with the liquid containing bag 21 placed on the tray 19, the liquid containing bag 21 is connected to the supply needle 18.

[0015] The liquid containing bag 21 includes a bag body 22 and a supply part 23. The liquid containing bag 21 may include an auxiliary part 24. The bag body 22 is capable of containing liquid. The supply unit 23 supplies the liquid contained in the bag body 22 to the outside. The auxiliary unit 24 assists in connecting the supply unit 23 to the supply needles 18. The auxiliary unit 24 positions the supply unit 23 relative to the tray 19, making it easier for the supply unit 23 to connect to the supply needles 18 when the tray 19 is attached.

[0016] 1, the liquid containing bag 21 is, for example, an ink pack that contains ink as the liquid. The ink, which is an example of a photosensitive liquid, may be an ultraviolet curable ink.

[0017] While FIG. 1 shows an example of a liquid ejection device 11 equipped with one mounting unit 20, the liquid ejection device 11 may be equipped with multiple mounting units 20. In this case, the multiple liquid containing bags 21 attached to the multiple mounting units 20 may contain different types of liquid. The types of liquid may be, for example, different colors. The multiple liquid containing bags 21 may contain, for example, inks of different colors. The multiple liquid containing bags 21 may contain different types of liquid, such as inks of different ink colors, such as cyan, magenta, yellow, and black. The liquid may be pigment ink or dye ink. The liquid may also be a coating liquid, which is a type of colorless, transparent liquid. Note that when the liquid ejection device 11 is configured to be able to mount multiple liquid containing bags 21, at least one of the liquid containing bags 21 may contain a photosensitive liquid.

[0018] <Configuration of liquid containing bag 21> Next, the configuration of the liquid containing bag 21 will be described with reference to Fig. 2. As shown in Fig. 2, the bag body 22 constituting the liquid containing bag 21 is formed by folding a single film 31 in half so that the peripheral edges overlap, and then joining the overlapping upper and lower peripheral edges. The bag body 22 includes two film portions 31A and 31B that overlap one another by folding the single film 31 in half. In other words, the bag body 22 has a first film portion 31A and a second film portion 31B as two film portions that overlap one another.

[0019] The single film 31 that is the material of the bag body 22 is, for example, rectangular. Therefore, the bag body 22 has a rectangular shape in a plan view. The rectangular bag body 22 has four sides 24f, 24s, and 24r. Here, the side of the bag body 22 where the side 24f to which the supply unit 23 is fixed is defined as the front side, and the side of the bag body 22 where the side 24r opposite the supply unit 23 is defined as the rear side. The bag body 22 has the four sides 24f, 24s, and 24r, namely the front side 24f, the rear side 24r, and two side sides 24s on the left and right.

[0020] The rear edge portion 24r is a folded end portion 25 formed by folding one sheet of film 31. The two side edge portions 24s and the front edge portion 24f are joined ends 26 formed by joining the first film portion 31A and the second film portion 31B on three sides. That is, the bag body 22 has a folded end portion 25 along one side portion 24r and three joined ends 26 along the three side portions 24s, 24f. One folded end portion 25 is provided along the rear edge portion 24r. The three joined ends 26 are provided along the three side portions 24s, 24f.

[0021] As described above, the bag body 22 has one or more folded ends 25 formed by folding a single sheet of film 31 so that its peripheral edges overlap, and joined ends 26 formed by joining the films 31 together at their overlapping peripheral edges. In particular, in this embodiment, the bag body 22 is manufactured by folding a single rectangular film 31 in half so that its peripheral edges overlap, and thus has one folded end 25 and three joined ends 26. One folded end 25 is formed by a folded portion formed when the single sheet of film 31 is folded in half so that its peripheral edges overlap. The three joined ends 26 are formed by joining three side portions 24s, 24f, which are the overlapping peripheral portions of the film 31. Note that the bag body 22 of this embodiment does not have a gusset.

[0022] The bag body 22 contains a photosensitive liquid that reacts to light. For this reason, the film 31 is a light-blocking film. The film 31 is formed from a material with high light-blocking properties. The film 31 is, for example, a laminated film. The film 31 may include a light-blocking layer 40 (see FIG. 5) in at least one of the laminated layers. The liquid containing bag 21 is, for example, formed by joining the film 31 having the light-blocking layer 40 to the bag body 22, and the photosensitive liquid is sealed inside the bag body 22.

[0023] The photosensitive liquid may be an ultraviolet-curable liquid. When the liquid is ink, the photosensitive liquid is, for example, an ultraviolet-curable ink. The ultraviolet-curable liquid hardens through a chemical reaction caused by ultraviolet light. If part of the liquid in the liquid containing bag 21 hardens, the liquid may not be able to be properly supplied to the liquid ejection head 13, or even if the liquid can be supplied, the liquid may not be able to be properly ejected by the liquid ejection head 13. Therefore, a light-blocking measure for the liquid containing bag 21 is necessary.

[0024] However, simply joining the overlapping film portions 31A and 31B of the film 31 at the three sides 24s and 24f by heat welding leaves the end surface 31c of the film 31 exposed (see, for example, FIG. 9). The end surface 31c is a cross section of the laminated film 31 cut along a plane parallel to the lamination direction. The end surface 31c faces a direction intersecting the direction in which the light-shielding layer 40 can block light. For this reason, there is a risk that light may penetrate into the bag body 22 from the end surface 31c through the synthetic resin layer located inside the light-shielding layer 40. Therefore, in this embodiment, the end surface 31c is covered by the film 31 itself by contacting the surface of the film 31. The detailed configuration will be described later.

[0025] In conventional technology, the edge of the film is processed to form an extended portion by extending a portion of the outer layer, including the light-shielding layer, by a predetermined length. The extended portion is curved into a U-shape and heat-sealed while covering the edge surface, preventing the edge surface from being exposed. This requires special processing to form the extended portion at the edge of the film. Furthermore, determining the optimal extension length of the extended portion requires experiments, simulation calculations, and other condition-finding work, which takes time and effort. Therefore, in this embodiment, the light-shielding properties of the joint edge 26, including the edge surface 31c, are improved using a method that does not require special processing of the film 31.

[0026] <Configuration of the joint end portion 26> Next, the configuration of the joint end portion 26 will be described with reference to Figures 3 and 4. Figure 3 shows the joint end portion 26 as seen from a direction along the side of the bag body 22. Figure 4 shows a cross section of the joint end portion 26 cut along a plane perpendicular to the side.

[0027] As shown in FIG. 3, at the end of the bag body 22, two film portions 31A, 31B formed by folding the film 31 in half overlap. The two film portions 31A, 31B joined at the joint end 26 are portions of a single film 31 formed in an overlapping state by folding the single film 31 in half. The two film portions 31A, 31B each have two surfaces. The two film portions 31A, 31B have two surfaces: an outer surface 31a and an inner surface 31b. The inner surfaces 31b of the two film portions 31A, 31B are joined together at three side portions 24s, 24f, which are the overlapping peripheral portions of the film 31, thereby forming a sealed space 34 (see FIG. 5). The sealed space 34 is a space in which a liquid is sealed.

[0028] The outer surface 31a shown in FIG. 3 is the surface of the bag body 22 that is exposed to external light. The outer surface 31a is the surface of the liquid containing bag 21 that comes into contact with the atmosphere. The inner surface 31b is the surface where the two film portions 31A and 31B are joined at their edges. The inner surface 31b is the surface that defines the enclosed space 34 (see FIG. 5) in which the photosensitive liquid is sealed, with the portion of the inner surface 31b that is inward of the joined portion. If light enters through the end surface 31c, there is a risk that the entering light will reach the enclosed space 34 through the synthetic resin layers that constitute the two film portions 31A and 31B. Therefore, in this embodiment, the joined end portion 26 is formed in the shape shown in FIG. 3, so that the end surface 31c is covered with the surface of the film 31. That is, the two end surfaces 31c of the two film portions 31A and 31B are covered with the surface of at least one of the two film portions 31A and 31B.

[0029] At least a portion of the joint end 26 is joined in the form shown in Fig. 3. In other words, the joint end 26 is joined in the form shown in Fig. 3 in the portions excluding some of the three side portions 24s, 24f that are the peripheral portions of the bag body 22. Here, "at least a portion" means that the entire joint end 26 may be joined in the form shown in Fig. 3, or only a portion of the joint end 26 may be joined in the form shown in Fig. 3. In the latter case, the portion joined in the form shown in Fig. 3 may be, for example, a portion excluding the supply portion 23, a portion excluding the supply portion 23 and a portion including its periphery, or a portion excluding the front side portion 24f.

[0030] As shown in FIG. 3, the joint end portion 26 has a configuration in which the two end faces 31c of the two film portions 31A, 31B are covered by the surface of at least one of the two film portions 31A, 31B. In this case, as shown in FIG. 3, the two end faces 31c may be covered by the surface of one of the two film portions 31A, 31B. In particular, the joint end portion 26 may have a configuration in which at least one of the two end faces of the two film portions 31A, 31B is rolled up in a state in which the two end faces 31c are covered by at least one of the outer surface 31a and the inner surface 31b of the film 31. In this case, as shown in the example in FIG. 3, the two end faces of the two film portions 31A, 31B may be rolled up together. In this case, as shown in the example of Fig. 3, the two end portions of the two film portions 31A, 31B may be rolled up while they are still overlapping, so that the two end faces 31c are covered by the outer surface 31a of one of the two film portions 31A, 31B. The joining end portion 26 shown in Fig. 3 is heat-welded in this rolled up state.

[0031] As shown in FIG. 4, the main material of the film 31 is a synthetic resin material. This synthetic resin material is a thermoplastic synthetic resin material. This synthetic resin material is a synthetic resin material that can be welded at a predetermined heating temperature. Two film portions 31A, 31B are thermally welded at a predetermined heating temperature in a rolled configuration as shown in FIG. 4, thereby forming the joint edge portion 26 shown in FIGS. 3 and 4. As shown in FIG. 4, two end surfaces 31c of the two film portions 31A, 31B are covered by the outer surface 31a, which is the surface of one of the two film portions 31A, 31B. Therefore, at the joint edge portion 26, the end surfaces 31c of the two film portions 31A, 31B are not exposed.

[0032] Before welding, a heat-weldable thermoplastic synthetic resin material is exposed on the outer and inner surfaces 31a and 31b of the two film portions 31A and 31B. Furthermore, a heat-weldable thermoplastic synthetic resin material is exposed over almost the entire area of ​​the two end surfaces 31c. Therefore, by heat welding in the manner shown in FIG. 4, the inner surfaces 31b of the two film portions 31A and 31B, the outer surfaces 31a of the two film portions 31A and 31B, and the end surfaces 31c and the outer surfaces 31a are heat-welded to each other via the synthetic resin material. After heat welding, the joining end 26 has the rolled-up form shown in FIG. 4. Therefore, the end surfaces 31c of the film portions 31A and 31B are not exposed to light. The film 31 has a layered structure including a light-shielding layer 40 (see FIG. 5), which is omitted from FIG. 4.

[0033] <About the laminated structure of Film 31> Next, the laminated structure of the film 31 that constitutes the bag body 22 will be described with reference to Fig. 5. As shown in Fig. 5, the bag body 22 is formed of one film 31. In the bag body 22, the enclosed space 34 that can enclose a liquid is formed by one film 31.

[0034] As shown in Figure 5, The film 31 may be a laminated film including a base layer 36 in contact with the enclosed space 34, a protective layer 39, and at least one light-shielding layer 40 located between the base layer 36 and the protective layer 39. The film 31 may be a laminated film including a metal layer 38 located between the base layer 36 and the protective layer 39. At least one light-shielding layer 40 may be located between the base layer 36 and the metal layer 38.

[0035] The film 31 may have a base layer 36, a light-shielding layer 40, an intermediate resin layer 37, a light-shielding layer 40, a metal layer 38, a light-shielding layer 40, and a protective layer 39, which are layered in this order from the enclosed space 34 side. The thickness of the film 31 is the total thickness of the layers 36 to 40. The thickness of the film 31 may be a predetermined value within a range of, for example, 0.08 to 0.2 mm. However, the thickness of the film 31 may be outside this range.

[0036] The light-shielding layer 40 may be an adhesive layer interposed between the four layers 36, 37, 38, and 39. The adhesive layer that constitutes the light-shielding layer 40 bonds the surfaces of the layers 36, 37, 38, and 39 together. The light-shielding layer 40 may be a printed layer made of a black adhesive containing a black colorant. That is, the light-shielding layer 40 may be a black-painted layer. Examples of adhesives that can be used to form the light-shielding layer 40 include urethane-based adhesives, ester-based adhesives, ethylene-based adhesives, and epoxy-based adhesives. The black colorant may contain, for example, carbon, iron black, or pine soot. The black colorant may be formed by mixing multiple colorants of different colors. The black colorant may be formed on the layer surface by applying multiple colorants of different colors to the layer surface. The light-shielding layer 40 may be a black-painted layer formed as a layer separate from the adhesive layer.

[0037] The base material layer 36 may be formed of a heat-sealable synthetic resin such as nylon (Ny), polypropylene (PP), or polyethylene (PE). The base material layer 36 may be a blend of two types of synthetic resin. For example, it may be a blend of nylon and polypropylene. The synthetic resin used for the base material layer 36 has excellent heat-sealing properties. The base material layers 36 of the two film portions 31A and 31B are welded together, for example, by heat.

[0038] The intermediate resin layer 37 may be made of nylon, which is resistant to oil and punctures, or may be made of polypropylene or polyethylene.

[0039] The metal layer 38 may be made of aluminum (Al). Aluminum can suppress the transmission of gases and ultraviolet rays. The thickness of the metal layer 38 may be, for example, a predetermined value within a range of 5 μm or more and 20 μm or less. The thicker the metal layer 38, the more rigid the film 31 becomes and the more effectively it can suppress the transmission of gases and ultraviolet rays. If the metal layer 38 is too thin, the liquid containing bag 21 may not be strong enough to withstand impacts such as being dropped. On the other hand, if the metal layer 38 is too thick, the film 31 becomes difficult to deform, and the liquid discharge device 11 may not be able to supply liquid from the liquid containing bag 21 with its capacity, resulting in more liquid than expected remaining in the liquid containing bag 21. Note that the thickness of the metal layer 38 is merely an example, and a value outside the above range may be used.

[0040] The protective layer 39 is made of, for example, nylon (Ny). The protective layer 39 may also be made of polyethylene terephthalate (PET). In this case, the polyethylene terephthalate may have alumina vapor-deposited on its surface. Polyethylene terephthalate vapor-deposited with alumina has barrier properties against oxygen and water vapor, and is resistant to impact and vibration.

[0041] <Operation of the embodiment> Next, the operation of the liquid containing bag 21 of this embodiment will be described with reference to FIGS. The bag body 22 of the liquid containing bag 21 has four sides 24r, 24s, and 24f. Of the four sides 24r, 24s, and 24f of the bag body 22, one side 24r is a folded end 25 formed by folding the film 31. The folded end 25 is an end without an end face of the film 31, and therefore provides high light-blocking properties. In addition, the three sides 24s and 24f are jointed ends 26 where the ends of two film portions 31A and 31B are joined. The jointed ends 26 are heat-sealed while maintaining the configuration shown in Figures 3 and 4. The end face 31c, which is likely to be a source of light penetration, is covered by the outer surface 31a. In other words, the end face 31c is covered by the film 31. Therefore, the jointed ends 26 provide high light-blocking properties.

[0042] As shown in Figures 5 and 6, in the film 31 of this embodiment, a light-shielding layer 40 is located between the base material layer 36 and the metal layer 38. If the light-shielding layer 40 were not present between the base material layer 36 and the metal layer 38, the two metal layers 38 would face each other at the joint between the two film portions 31A and 31B, sandwiching the two base material layers 36 therebetween. For example, as shown by the two-dot chain line in Figure 6, a small amount of light incident from the joint end 26 is repeatedly reflected between the two metal layers 38 and reaches the photosensitive liquid in the enclosed space 34. In this case, the liquid is likely to harden due to the small amount of light that enters the enclosed space 34.

[0043] In contrast, in the film 31 of this embodiment, the light-shielding layer 40 is located between the base material layer 36 and the metal layer 38. Therefore, even if a small amount of light enters from the joint end 26, that small amount of light is blocked by the light-shielding layer 40. Therefore, the small amount of light that enters does not reach the metal layer 38. Therefore, as shown by the dashed-dotted line in FIG. 6 , the small amount of light that enters from the joint end 26 is absorbed by the light-shielding layer 40. Therefore, even if a small amount of light enters from the joint end 26, that small amount of light does not reach the liquid in the enclosed space 34. This further improves the light-blocking properties of the liquid containing bag 21, and further suppresses hardening of the liquid in the enclosed space 34.

[0044] <Manufacturing method> Next, a method for manufacturing the liquid containing bag 21 will be described with reference to Figures 7 to 10. The method for manufacturing the liquid containing bag 21 involves manufacturing the liquid containing bag 21, which includes a bag body 22 formed by joining films 31 together and a supply unit 23 capable of supplying the liquid sealed inside the bag body 22. A light-blocking film is used as the film 31 forming the bag body 22. The liquid contained inside the bag body 22 is a photosensitive liquid. The method for manufacturing the liquid containing bag 21 includes the following two steps (a) and (b). (a) Folding one film 31 in half so that the peripheral edges overlap to form one folded end 25. (b) joining the overlapping peripheral edges to form a joining edge 26; In this (b), at least a portion of the joint end 26 is formed by joining two end faces 31c of two film parts 31A, 31B that overlap at the peripheral portion in a manner that covers the surface of at least one of the film parts 31A, 31B.

[0045] The manufacturing method of the liquid containing bag 21 mainly consists of four steps. The first step (a) is a step of folding one sheet of film 31 in half to form the folded end 25. The second step (b) is a step of joining the three side portions 24s, 24f that are the peripheral portions of the two film portions 31A, 31B. Before this joining, the supply portion 23 is sandwiched between the front side portion 24f.

[0046] One sheet of film 31 is prepared by cutting it into a predetermined size and a predetermined rectangular shape that can form bag body 22. In other words, one sheet of film 31 for forming bag body 22 is formed by cutting from a raw material film.

[0047] <1st step (a)> As shown in Fig. 7, one sheet of film 31 is folded in two. Using a creasing machine or the like, one sheet of film 31 is folded in two so that the peripheral edges overlap. By folding in two, folded end 25 is formed.

[0048] As shown in Fig. 8, after one sheet of film 31 is folded in half, the base of supply unit 23 is sandwiched in the center of front side 24f. Supply unit 23 may be set on one sheet of film 31 before folding one sheet of film 31 in half. As shown in Fig. 9, two film portions 31A and 31B formed by folding in half overlap at three sides 24s and 24f.

[0049] <Second step (b)> The second step (b) may include a step (b1) of forming the wrapping shape shown in FIG. 10, and a step (b2) of welding while maintaining the wrapping shape shown in FIG.

[0050] As shown in Fig. 9, two end faces 31c of two film portions 31A, 31B are exposed at three side portions 24s, 24f. In step (b1), the two end faces 31c are covered by outer surface 31a, which is the surface of one of the two film portions 31A, 31B. In this embodiment, the configuration shown in Fig. 10 is created, in which the end faces 31c can be covered by outer surface 31a. In other words, by rolling up the ends of the two film portions 31A, 31B, the configuration shown in Fig. 10 is created, in which the end faces 31c are covered by outer surface 31a.

[0051] The three side portions 24s, 24f are heat-welded while maintaining the configuration shown in FIG. 10. In this case, it is sufficient if the three side portions 24s, 24f can be joined by heat welding at once, but if it is difficult to heat-weld them in one go, the heat welding may be repeated three times for each side portion. Also, step (b2), which is the heat welding step, may be divided into two steps. For example, the side portions 24s, 24f are heat-welded in the state shown in FIG. 9. This welding forms the enclosed space 34. This welding is also a temporary welding before the joining end portion 26 is formed.

[0052] Next, as shown in Fig. 10, the ends of the two film portions 31A and 31B are rolled up to create the configuration shown in Fig. 10. Next, the sides 24s and 24f are heat-sealed while maintaining the configuration shown in Fig. 10. The heat-sealing may be thermocompression bonding, in which heat is applied while pressure is applied in the joining direction. When thermocompression bonding is performed, the configuration shown in Fig. 10 may be placed in a concave mold and thermocompression bonded to prevent the configuration shown in Fig. 10 from collapsing.

[0053] The base material layer 36, intermediate resin layer 37, and protective layer 39 that make up the film 31 are thermally melted by heating at a predetermined heating temperature during thermal welding. In this melted state, pressure is applied to the side portions 24s, 24f of the two film portions 31A, 31B. The side portions 24s, 24f are thermally melted by applying pressure in the thickness direction while maintaining the configuration shown in FIG. 10. Although the configuration shown in FIG. 10 becomes slightly flattened in the thickness direction due to pressure, the configuration in which the end face 31c is covered by the outer surface 31a is maintained. Therefore, at the joint ends 26 of the three side portions 24s, 24f, the end faces 31c are covered by the outer surface 31a.

[0054] Photosensitive liquid is poured from the supply unit 23 into the liquid containing bag 21 manufactured in this manner. The manufactured liquid containing bag 21 has one side 24r as a folded end 25, and therefore has higher light-blocking properties than the joint ends 26 formed on the other three side parts 24s, 24f. Although the three side parts 24s, 24f have end faces 31c through which light can penetrate relatively easily, the end faces 31c are covered by the outer surface 31a. In other words, the end faces 31c are covered by the film 31. Therefore, high light-blocking properties are ensured for the joint ends 26 as well.

[0055] <Effects of the embodiment> Therefore, according to this embodiment, the following effects can be obtained. (1) The liquid containing bag 21 comprises a bag body 22 and a supply section 23. The bag body 22 is formed into a bag shape by joining films 31. The supply section 23 is configured to be able to supply the liquid sealed inside the bag body 22. The film 31 forming the bag body 22 is a light-blocking film. The liquid is a photosensitive liquid. The bag body 22 has one or more folded ends 25 and a jointed end 26. The one or more folded ends 25 are formed by folding a single film 31 so that its peripheral edges overlap. The jointed end 26 is formed by joining the films 31 to each other at their overlapping peripheral edges. At least a portion of the jointed end 26 is joined in such a manner that the two end faces 31c of the two film sections 31A, 31B that overlap at their peripheral edges are covered by the surface of at least one of the two film sections 31A, 31B. According to this configuration, one or more sides of the bag body 22 are folded edges 25 formed by folding the film 31. Therefore, the light-blocking properties of the bag body 22 can be improved compared to a bag body formed from two films and having a joint edge where the end surface 31c is located around the entire periphery. Furthermore, at least a portion of the joint edge 26 is covered by the light-blocking film 31, which covers the two end surfaces 31c of the two film portions 31A and 31B. Therefore, the joint edge 26 also has high light-blocking properties. Furthermore, since the film 31 is used directly to cover the end surface 31c, special processing such as extending only a portion of the film 31 is not required. Therefore, a liquid-containing bag 21 with high light-blocking properties can be provided with a simple configuration. An example of a photosensitive liquid is an ultraviolet-curable liquid.

[0056] (2) The bag body 22 has one folded end 25 formed by folding a single rectangular film 31 in half so that the peripheral edges overlap, and three joined ends 26 formed by joining the film 31 together at the three overlapping sides of the peripheral edges of the film 31. With this configuration, the bag body 22 can be formed using only one film 31. Therefore, the liquid containing bag 21 can be easily manufactured.

[0057] (3) The two film portions 31A, 31B have outer surfaces 31a and inner surfaces 31b, and the inner surfaces 31b are joined at their peripheries to form an enclosed space 34 in which a liquid is enclosed. At least one of the ends of the two film portions 31A, 31B is rolled up in a state in which two end surfaces 31c are covered by at least one of the outer surface 31a and the inner surface 31b of the film 31. With this configuration, the two end surfaces 31c at the joined end portion 26 are covered by the film 31, thereby improving the light-blocking properties of the bag body 22.

[0058] (4) In the configuration (4), the two ends of the two film portions 31A and 31B are rolled together. With this configuration, the two end faces 31c of the joint end portion 26 are covered with the film 31, improving the light-blocking properties of the bag body 22.

[0059] (5) In this embodiment, the two end portions of the two film portions 31A, 31B are rolled up while remaining overlapped, with the two end faces 31c covered by the outer surface 31a of the film 31. With this configuration, the two end faces 31c at the joint end 26 are covered by the film 31, improving the light-blocking properties of the bag body 22. Because the end portions of the two film portions 31A, 31B are rolled up while remaining overlapped, manufacturing is easier than when they are rolled up individually.

[0060] (6) The film 31 is a laminated film including a base layer 36, a protective layer 39, and at least one light-shielding layer 40. The base layer 36 contacts the enclosed space 34 in which the liquid is sealed. The light-shielding layer 40 is located between the base layer 36 and the protective layer 39. With this configuration, the presence of the light-shielding layer 40 constituting the film 31 provides the bag body 22 with high light-shielding properties. At the joint end 26, the two end faces 31c of the two film portions 31A, 31B are covered by the surfaces of the film portions 31A, 31B, and are therefore covered by the light-shielding layer 40 via the base layer 36, so that the two end faces 31c are light-shielded.

[0061] (7) The film 31 is a laminated film including a metal layer 38 located between a base layer 36 and a protective layer 39. This configuration provides high light blocking capability and high gas permeation prevention capability (gas barrier capability). This not only protects the liquid in the liquid storage bag 21 from light such as ultraviolet rays, but also prevents deterioration in the quality of the liquid due to gas entering from the outside through the film 31. For example, it prevents gas such as air that has permeated the film 31 from generating bubbles in the liquid in the bag body 22.

[0062] (8) At least one light-shielding layer 40 is located between the base layer 36 and the metal layer 38. In a film 31 in which the light-shielding layer 40 is not located between the base layer 36 and the metal layer 38, a small amount of light entering through the joined end 26 of the liquid containing bag 21 may enter the interior (enclosed space 34) of the liquid containing bag 21 while repeatedly reflecting between the opposing metal layers 38. With this configuration, the light-shielding layer 40 is located between the opposing metal layers 38 at the joined portion of the bag body 22. Therefore, the light-shielding layer 40 can prevent the small amount of light entering through the joined end 26 of the bag body 22 from repeatedly reflecting between the opposing metal layers 38. This makes it possible to provide a liquid containing bag 21 with both higher light-shielding properties and high gas barrier properties with a simple configuration.

[0063] (9) A method for manufacturing a liquid-containing bag 21 including a bag body 22 formed by joining films 31 together and a supply unit 23 capable of supplying the liquid sealed inside the bag body 22. The film 31 forming the bag body 22 is a light-blocking film. The liquid is a photosensitive liquid. This manufacturing method includes the following steps (a) and (b). (a) Folding a sheet of film 31 so that the peripheral edges overlap to form one or more folded edges 25. (b) joining the overlapping peripheral edges to form a joining edge 26; In the above (b), a part of the joined end portion 26 is formed by joining two film portions 31A, 31B that overlap at their peripheral portions in a manner that covers two end faces 31c with the surface of at least one of the film portions 31A, 31B. This manufacturing method makes it possible to provide a liquid containing bag 21 with high light-blocking properties with a simple configuration.

[0064] <Example of change> The above embodiment can be modified as shown in the following modified examples. Furthermore, the above embodiment and the modified examples shown below can be appropriately combined to form further modified examples, or the modified examples shown below can be appropriately combined to form further modified examples.

[0065] The bag body 22 of the liquid containing bag 21 may be manufactured using a film 31 shown in FIG. 11. While the film 31 of the first embodiment includes a metal layer 38, it may not include the metal layer 38, as in the film 31 shown in FIG. 11. In the example shown in FIG. 11, the film 31 has a base material layer 36, a light-shielding layer 40, an intermediate resin layer 37, a light-shielding layer 40, and a protective layer 39, which are layered in this order from the enclosed space 34 side. The film 31 includes two light-shielding layers 40. The base material layer 36 may be formed of a heat-weldable synthetic resin such as polyethylene (PE). The base material layer 36 may be formed of nylon (Ny) or polypropylene (PP). The base material layers 36 of the two film portions 31A and 31B are welded together, for example, by heat. The metal layer 38 may be formed of aluminum (Al). The protective layer 39 may be formed of polyethylene terephthalate (PET). The protective layer 39 may be made of nylon (Ny).

[0066] The liquid containing bag 21 may be, for example, a gusset type having a gusset 29 with folds 28. For example, as shown in FIG. 12, the liquid containing bag 21 includes a bag body 22 and a supply unit 23. The bag body 22 is capable of containing liquid. The bag body 22 is formed by joining one film 31 and two second films 32 at their respective ends. In this case, the one film 31 is folded in half so that the peripheries overlap, forming the folded end 25. The joined end 26 may be formed by joining the film 31 and the other films 32 at three side portions 24s, 24f, which are the overlapping peripheries of the film 31. Two peripheries of one film 31 are positioned opposite each other, overlapping vertically with a gap between them. The upper periphery of the film 31 and the upper edge of the second film 32 are joined at their respective ends, forming the joined end 26 at the upper side portion 24s. Furthermore, the lower peripheral edge of the film 31 and the lower edge of the second film 32 are joined at their respective ends, thereby forming a joined edge 26 at the lower side 24s. In this manner, one of the gussets 29 is formed. For the other gusset 29, another second film 32 is joined to the film 31 at the upper side 24s and the lower side 24s, thereby forming a joined edge 26. For part of the front side 24f, the first film and the second film 32 are joined at the side 24f, thereby forming a joined edge 26. The joined edge 26 is welded in the manner shown in FIG. 3.

[0067] 13, the joint end portion 26 may be formed by winding the ends of two film portions 31A, 31B into a roll while the two portions are overlapped. The end surface 31c of the two film portions 31A, 31B wound into a roll is covered by the outer surface 31a of one of the film portions 31A, 31B. In this way, the joint end portion 26 may be formed by winding two film portions into a roll while the two portions are overlapped, as long as the end surface 31c is covered by the outer surface 31a.

[0068] 14, the joint edge 26 may be configured such that the edges of the two film portions 31A, 31B are rolled up separately. By rolling up the edges of the two film portions 31A, 31B in opposite directions, the edge faces 31c of each film portion 31A, 31B are covered by their own outer surfaces 31a. That is, the edge face 31c of the first film portion 31A is covered by the outer surface 31a of the first film portion 31A, and the edge face 31c of the second film portion 31B is covered by the outer surface 31a of the second film portion 31B.

[0069] 15, the joint edge 26 may be configured such that the edges of the two film portions 31A, 31B are rolled up separately. By rolling up the edges of the two film portions 31A, 31B in opposite directions, the edge faces 31c of each film portion 31A, 31B are covered by their own inner faces 31b. That is, the edge face 31c of the first film portion 31A is covered by the inner face 31b of the first film portion 31A, and the edge face 31c of the second film portion 31B is covered by the inner face 31b of the second film portion 31B.

[0070] As shown in FIG. 16 , the joint edge 26 may be configured such that only one of the two film portions 31A, 31B is rolled up to cover the end surface 31c of the other. In this case, the end surface 31c of one film portion 31A rolled up to cover the end surface 31c of the other film portion 31B is covered by the outer surface 31a of the other film portion 31B. In the example shown in FIG. 15 , the first film portion 31A is rolled up to cover the end surface 31c of the second film portion 31B. Conversely, the second film portion 31B may be rolled up to cover the end surface 31c of the first film portion 31A. In the example shown in FIG. 15 , the end surface 31c of the first film portion 31A is covered by the outer surface 31a of the flat portion of the second film portion 31B. Alternatively, the leading end of the first film portion 31A may be rolled up into a roll so that its end surface 31c is covered by its own inner surface 31b.

[0071] In the example shown in Figure 3, at the joint end 26, the two end faces 31c of the two film portions 31A, 31B are covered by the outer surface 31a of the second film portion 31B, but instead they may be covered by the outer surface 31a of the first film portion 31A.

[0072] The shape of the bag body 22 in a plan view is not limited to a rectangular shape. In other words, the shape of a single film 31 is not limited to a rectangular shape. For example, a circular or elliptical film 31 may be folded in half to form a semicircular bag body 22.

[0073] The number of sides formed by folding one sheet of film 31 is not limited to one. For example, it may be two. In other words, the bag body 22 may have two folded ends 25. In this case, for example, the liquid containing bag 21 may be manufactured by folding one sheet of rectangular film 31 so that the two side edges 24s become the folded ends 25.

[0074] The photosensitive liquid is not limited to UV-curable liquid. The photosensitive liquid may be a liquid that reacts to visible light. The reaction of the liquid to light is not limited to hardening. The liquid may react with light and change color. In this way, the property of the photosensitive liquid that changes when irradiated with light may be something other than hardening.

[0075] In the above embodiment, the metal material of the metal layer 38 is not limited to aluminum, and may be a metal other than aluminum. The metal layer 38 may be made of stainless steel, copper, gold, silver, tin, platinum, or the like.

[0076] The joining of the joining end 26 is not limited to welding, and may be joining using an adhesive. The joining end 26 may be formed by joining with an adhesive in the form shown in Figures 3 and 13 to 16.

[0077] The welding of the film is not limited to heat welding, and other welding methods such as high frequency welding and ultrasonic welding may also be used. The wrapping direction of the shape at the joint edge 26 may be either outward or inward, but it is preferable that it is consistent on all three sides. Note that the wrapping direction of the shape at the joint edge on all three sides may be different.

[0078] The photosensitive liquid sealed in the liquid containing bag is not limited to UV-curable ink. It may be a UV-curable liquid other than ink. For example, it may be a liquid that changes when exposed to visible light or infrared light.

[0079] The photosensitive liquid is not limited to a photocurable liquid. The photosensitive liquid may be a liquid that changes its properties or shape when exposed to light due to a chemical reaction other than hardening. The liquid containing bag 21 is not limited to being used for printing. The liquid containing bag 21 may be used to seal in the bag body 22 a photosensitive liquid that is used for purposes other than printing.

[0080] The liquid ejection device 11 may be a liquid ejection device that ejects liquids other than ink. The state of the liquid ejected as minute droplets from the liquid ejection device includes granular, teardrop-like, and string-like tails. The liquid referred to here may be any material that can be ejected from the liquid ejection device. For example, the liquid may be any state in which a substance is in a liquid phase, including fluids such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, and liquid metals (metal melts). The liquid includes not only liquids as a single state of matter, but also particles of functional materials made of solids such as pigments and metal particles dissolved, dispersed, or mixed in a solvent. Representative examples of liquids include inks and liquid crystals, as described in the above embodiments. Here, ink includes various liquid compositions such as general water-based inks and oil-based inks, as well as gel inks and hot-melt inks. Specific examples of liquid ejection devices include devices that eject liquids containing dispersed or dissolved materials such as electrode materials and color materials used in the manufacture of liquid crystal displays, electroluminescent (EL) displays, surface-emitting displays, and color filters. The liquid ejection device may also be a device that ejects bioorganic materials used in biochip manufacturing, a device used as a precision pipette to eject sample liquids, a textile printing device, or a microdispenser. The liquid ejection device may also be a device that precisely ejects lubricating oil onto precision machinery such as watches and cameras, or a device that ejects transparent resin liquids such as ultraviolet-curing resins onto substrates to form microscopic hemispherical lenses (optical lenses) used in optical communication devices. The liquid ejection device may also be a device that ejects etching liquids such as acids or alkalis to etch substrates. The liquid containing bag 21 having the configuration of the above-described embodiment or modified example may be applied to such liquid ejection devices.

[0081] <Additional Notes> The technical concepts and effects that can be understood from the above-described embodiment and modified examples will be described below. (A) A liquid containing bag comprising a bag body formed by joining films together to form a bag, and a supply section capable of supplying the liquid sealed inside the bag body, wherein the film forming the bag body is a light-blocking film, the liquid is a photosensitive liquid, and the bag body has one or more folded ends formed by folding one sheet of the film so that its peripheral edges overlap, and a joined end formed by joining the films to each other or to another film at the overlapping peripheral edges, and at least a portion of the joined end is joined in a manner such that the two end faces of the two film sections overlapping at the peripheral edges are covered by at least one surface of the two film sections.

[0082] According to this configuration, one or more side portions of the bag body are folded edges formed by folding the film. Therefore, the light-blocking properties of the bag body can be improved compared to a bag body configured with a joined edge where the end faces formed by two films are located around the entire periphery. Furthermore, at least a portion of the joined edge is covered by the light-blocking film on the two end faces of the two film portions, so that the joined edge also has high light-blocking properties. Furthermore, since the film is used directly to cover the end faces, special processing such as extending only a portion of the film layer is not required. Therefore, a liquid-containing bag with high light-blocking properties can be provided with a simple configuration. An example of a photosensitive liquid is an ultraviolet-curable liquid.

[0083] (B) In the liquid containing bag described in (A) above, the bag body may have one folded end formed by folding a single rectangular film in half so that the peripheral edges overlap, and three joined ends formed by joining the film to each other at the three overlapping sides of the peripheral edge of the film. This configuration allows the bag body to be formed using only a single film. This makes it easy to manufacture the liquid containing bag.

[0084] (C) In the liquid containing bag described in (A) or (B) above, the two film portions have outer and inner surfaces as the surfaces, and the inner surfaces are joined at the peripheral edge to form a sealed space in which the liquid is sealed, and the configuration may be such that at least one of the ends of the two film portions is rolled up in a state in which the two end surfaces are covered by at least one of the outer and inner surfaces of the film. With this configuration, the two end surfaces at the joined end are covered by film, thereby improving the light-blocking properties of the bag body.

[0085] (D) In ​​the liquid storage bag described in (C) above, the two ends of the two film portions may be rolled together. With this configuration, the two end faces of the joined end are covered with film, improving the light-blocking properties of the bag body.

[0086] (E) In the liquid storage bag described in (D) above, the configuration may be such that the two ends of the two film portions are rolled up while remaining overlapped, with the two end faces covered by the outer surfaces of the films. With this configuration, the two end faces at the joined end are covered by film, improving the light-blocking properties of the bag body. Since the ends of the two film portions are rolled up while remaining overlapped, manufacturing is easier than when they are rolled up individually.

[0087] (F) In the liquid storage bag described in any one of (A) to (E) above, the film may be a laminated film including a base layer in contact with the enclosed space in which the liquid is sealed, a protective layer, and at least one light-shielding layer located between the base layer and the protective layer. With this configuration, the presence of the light-shielding layer constituting the film provides the bag with high light-shielding properties. At the joined end, the two end faces of the two film sections are covered with the surfaces of the film sections, and thus are covered with the light-shielding layer via the base layer, thereby providing light-shielding to the two end faces. Therefore, a liquid storage bag with high light-shielding properties can be provided with a simple configuration.

[0088] (G) In the liquid storage bag described in (F) above, the film may be a laminated film including a metal layer located between the base layer and the protective layer. This configuration provides high light blocking capability and high gas permeation prevention capability (gas barrier capability). This not only protects the liquid in the liquid storage bag from light such as ultraviolet rays, but also prevents deterioration of the liquid quality due to gas penetrating through the film from the outside.

[0089] (H) In the liquid storage bag described in (G) above, at least one light-shielding layer may be located between the base material layer and the metal layer. In a film in which no light-shielding layer is located between the base material layer and the metal layer, a small amount of light entering through the joined end of the liquid storage bag may enter the interior (enclosed space) of the liquid storage bag while repeatedly reflecting between the opposing metal layers. With this configuration, the light-shielding layer is located between the opposing metal layers at the joined portion of the bag body. Therefore, the light-shielding layer can prevent the small amount of light entering through the joined end of the bag body from repeatedly reflecting between the opposing metal layers. This makes it possible to provide a liquid storage bag with both higher light-shielding properties and high gas barrier properties with a simple configuration.

[0090] (H) A method for manufacturing a liquid containing bag comprising a bag body formed by joining films together and a supply unit capable of supplying the liquid sealed inside the bag body, wherein the film forming the bag body is a light-blocking film and the liquid is a photosensitive liquid, the method comprising: (a) folding one sheet of the film so that its peripheral edges overlap to form one or more folded edges; and (b) joining the overlapping peripheral edges to form a joined edge, wherein in (b), a portion of the joined edge is formed by joining two film portions that overlap at the peripheral edges in a manner that covers two end faces of at least one of the film portions. This manufacturing method can provide a liquid containing bag with high light-blocking properties with a simple configuration. [Explanation of symbols]

[0091] 11...liquid ejection device, 12...housing, 13...liquid ejection head, 14...support portion, 15...medium, 16...nozzle, 17...supply flow path, 18...supply needle, 19...tray, 20...mounting portion, 21...liquid containing bag, 22...bag body, 23...supply portion, 24...auxiliary portion, 24f...edge portion (front edge portion), 24r...edge portion (rear edge portion), 24s...edge portion (side edge portion), 25...folded end portion, 26...jointed end portion, 28...fold, 31...film, 31A...first film portion (film portion), 31B...second film portion (film portion), 31a...outer surface, 31b...inner surface, 31c...end surface, 32...second film, 34...enclosed space, 36...base material layer, 37...intermediate resin layer, 38...metal layer, 39...protective layer, 40...light-shielding layer.

Claims

1. A liquid containing bag including a bag body formed by joining films and a supply part capable of supplying the liquid sealed inside the bag body, the film forming the bag body is a light-blocking film, the liquid is a photosensitive liquid, The bag body is One or more folded edges formed by folding one sheet of the film so that peripheral edges overlap; a joint edge formed by joining the films together or joining the film to another film at the overlapping peripheral edge portion of the films; and A liquid storage bag characterized in that at least a portion of the joined end portion is joined in a manner in which the two end surfaces of the two film portions that overlap at the peripheral portion are covered by the surface of at least one of the two film portions.

2. The liquid containing bag according to claim 1, The bag body is characterized by having one folded end formed by folding a single rectangular film in half so that the peripheral edges overlap, and three joined ends formed by joining the films together at the three overlapping edges that are the peripheral edges of the film.

3. The liquid containing bag according to claim 1, the two film portions have outer and inner surfaces as the surfaces, and the inner surfaces are joined together at the peripheral edge portion to form an enclosed space in which the liquid is enclosed; The liquid storage bag is characterized in that the shape is such that at least one of the ends of the two film portions is rolled up in a state where the two end surfaces are covered by at least one of the outer surface and the inner surface of the film.

4. The liquid containing bag according to claim 3, The liquid containing bag is characterized in that the two end portions of the two film portions are rolled up together.

5. The liquid containing bag according to claim 4, The liquid storage bag is characterized in that the two ends of the two film portions are rolled up while remaining stacked on top of each other, with the two end faces covered by the outer surface of the film.

6. The liquid containing bag according to claim 1, The film is a base layer in contact with the enclosed space in which the liquid is enclosed; A protective layer; at least one light-shielding layer located between the base layer and the protective layer; A liquid storage bag characterized by being a laminated film comprising:

7. The liquid containing bag according to claim 6, The liquid storage bag is characterized in that the film is a laminated film including a metal layer located between the base layer and the protective layer.

8. The liquid containing bag according to claim 7, The liquid containing bag is characterized in that at least one light-shielding layer is located between the base material layer and the metal layer.

9. A method for manufacturing a liquid containing bag comprising a bag body formed by joining films together and a supply part capable of supplying a liquid sealed inside the bag body, the film forming the bag body is a light-blocking film, the liquid is a photosensitive liquid, (a) folding a sheet of the film so that its peripheral edges overlap to form one or more folded edges; (b) joining the overlapping peripheral edges to form a joined edge; Equipped with In (b), a portion of the joined end portion is formed by joining two end surfaces of two film portions that overlap at the peripheral portion in a manner that covers the two end surfaces with the surface of at least one of the film portions.

Images