Liquid storage bag and method for manufacturing liquid storage bag

Abstract

The invention provides a liquid storage bag and a manufacturing method of the liquid storage bag, wherein the liquid storage bag with high light shielding performance can be provided through a simple structure. A liquid storage bag (21) is provided with a bag body (22) and a supply unit (23). The bag body is formed into a bag shape by joining a film (31). The supply unit is configured so as to be able to supply the liquid sealed inside the bag body. And the film forming the bag body is a light-shading film. And the liquid is photosensitive liquid. The bag body has one or more folded ends (25) and one or more joined ends (26). The one or more folded end portions are formed by folding the one film so that the peripheral edge portions overlap. The joining end portion is formed by joining the films to each other at the overlapping peripheral edge portions of the films. At least a portion of the joining end portion is joined in such a manner that both end surfaces of the two thin film portions (31A, 31B) that overlap at the peripheral edge portion are covered by the surface of at least one of the two thin film portions.

Description

Technical Field

[0001] The present invention relates to a liquid storage bag for storing liquid and a method for manufacturing the liquid storage bag. Background Art

[0002] For example, Patent Document 1 discloses an ink bag, an example of a liquid storage bag that stores ink as an example of a liquid. The ink bag includes an ink container, an example of a bag body, that stores ink, and an ink supply hole, an example of a supply unit, provided in the ink container. When the ink bag is mounted on a printing device, ink is supplied from the ink supply hole to a recording unit within the printing device. The ink container is formed from a light-shielding laminate film. The laminate film has a laminated structure comprising a resin layer and a metal layer.

[0003] In the ink bag, the second resin layer, metal layer, and protective layer of the upper film on the surface extend from the base layer to form an extended portion. Because the metal layer has light-blocking properties, this extended portion is folded back and attached to the surface of the lower film on the side surface. This light-blocking metal layer covers the exposed end surface of the base layer at the joint, preventing ultraviolet light from entering the ink bag from outside through the base layer.

[0004] However, while existing liquid storage bags can achieve light-blocking properties, they require a process to form extensions at the ends of the films, where the second resin layer, metal layer, and protective layer extend from the substrate layer. Furthermore, when joining the two films, the extensions of the upper film must be folded back and attached to the surface of the lower film. Furthermore, Patent Document 1 discloses a structure in which a UV-shielding resin is applied to the end faces of the substrate layer, or a structure in which the end faces of the substrate layer are covered with a strip-shaped sealing sheet. However, these structures also require the formation of extensions on the films, or require separate processes such as resin application and attachment of the strip-shaped sealing sheet. Furthermore, when the extensions covering the end faces of the substrate layer or the strip-shaped sealing sheet expose the end faces of resin layers such as the intermediate resin layer, there is a possibility that some light may pass through the resin layer exposed at the extensions or the end faces of the strip-shaped sealing sheet and reach the liquid within the liquid storage bag. Therefore, there is room for improvement in terms of light-blocking properties, and there is also the issue of a complex manufacturing process for the liquid storage bag. Therefore, a liquid storage bag having a simple structure and high light-shielding properties is desired.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-97620 Summary of the Invention

[0006] The liquid storage bag that solves the above-mentioned problem comprises a bag body formed by joining films into a bag shape and a supply part capable of supplying liquid sealed inside the bag body, the film forming the bag body is a light-shielding film, the liquid is a photosensitive liquid, and the bag body has: one or more folding ends, which are formed by folding a piece of the film in a manner that the peripheral portions overlap; a joining end, which is formed by joining the films to each other or to other films at the overlapping peripheral portions of the films, and at least a part of the joining end is joined in a manner such that the two end surfaces of the two film portions overlapping at the peripheral portions are covered by the surface of at least one of the two film portions.

[0007] In the manufacturing method of the liquid storage bag that solves the above-mentioned problem, the liquid storage bag has a bag body formed by joining films into a bag shape and a supply part that can supply liquid to be sealed inside the bag body, the film forming the bag body is a light-shielding film, and the liquid is a photosensitive liquid. The manufacturing method of the liquid storage bag includes: (a) forming one or more folded end parts by folding a piece of the film in a manner that the peripheral portions overlap; (b) forming a joined end part by joining the overlapping peripheral portions, and in (b), a part of the joined end part is formed by joining the two end surfaces of the two film portions overlapping at the peripheral portion to be covered by the surface of at least one of the two film portions. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram showing a liquid ejecting device according to an embodiment.

[0009] Figure 2 A three-dimensional diagram of a liquid storage bag.

[0010] Figure 3 It is a schematic diagram showing the joint end portion of the liquid storage bag.

[0011] Figure 4 It is a schematic cross-sectional view showing the joined end portion of the liquid storage bag.

[0012] Figure 5 It is a schematic cross-sectional view showing an end portion of the liquid storage bag.

[0013] Figure 6 This is a schematic cross-sectional view illustrating the function of the liquid storage bag.

[0014] Figure 7 This is a schematic diagram showing the manufacturing process of a liquid storage bag.

[0015] Figure 8 This is a schematic diagram showing the manufacturing process of a liquid storage bag.

[0016] Figure 9 It is a schematic diagram showing the end portion of the liquid storage bag before the end portion is joined to form the liquid storage bag.

[0017] Figure 10 A schematic diagram showing the steps of forming the joining end portion.

[0018] Figure 11 It is a schematic cross-sectional view showing an end portion of a liquid storage bag in a modified example.

[0019] Figure 12 It is a perspective view showing a liquid storage bag according to a modified example.

[0020] Figure 13 It is a schematic cross-sectional view of a joint end portion showing a modified example.

[0021] Figure 14 To express Figure 13 Schematic cross-sectional views of the joint end portions according to different modified examples.

[0022] Figure 15 To express Figure 14 Schematic cross-sectional views of the joint end portions according to different modified examples.

[0023] Figure 16 To express Figure 15 Schematic cross-sectional views of the joint end portions according to different modified examples. DETAILED DESCRIPTION

[0024] An embodiment of a liquid storage bag is described below with reference to the accompanying drawings. The liquid storage bag is used as a liquid supply source in a liquid ejection device. In the accompanying drawings, the liquid ejection device 11 is placed on a horizontal surface, with the Z axis representing the direction of gravity, and the X and Y axes representing directions along the horizontal surface. The X, Y, and Z axes are orthogonal to each other. The Y direction, parallel to the Y axis, represents the conveyance direction of the conveying medium 15. The X direction, parallel to the X axis, represents the width direction intersecting the conveyance direction of the medium 15.

[0025] Structure of the liquid ejection device 11

[0026] First, refer to Figure 1 , the structure of the liquid ejection device 11 is described. Figure 1As shown, the liquid ejecting device 11 ejects liquid supplied from the liquid storage bag 21. The liquid ejecting device 11 is, for example, a printing device that ejects ink as an example of liquid onto a medium 15 such as paper. The liquid ejecting device 11 is, for example, an inkjet printer. The liquid ejecting device 11 includes a liquid ejecting head 13 capable of ejecting liquid. The liquid ejecting device 11 may include a support portion 14 capable of supporting the medium 15. The liquid ejecting device 11 may include a housing 12 that accommodates the liquid ejecting head 13 and the support portion 14. The liquid ejecting device 11 prints text or an image on a medium 15 such as paper by ejecting ink droplets from the liquid ejecting head 13.

[0027] The liquid storage bag 21 is installed in the liquid ejection device 11 for use. The liquid storage bag 21 stores liquid supplied to the liquid ejection device 11. Specifically, the liquid storage bag 21 stores liquid supplied to the liquid ejection head 13. The liquid storage bag 21 of this embodiment seals a photosensitive liquid therein.

[0028] The support portion 14 supports the transported medium 15. The liquid ejection head 13 includes a nozzle 16. The liquid ejection head 13 is capable of ejecting liquid. The liquid ejection head 13 ejects liquid from the nozzle 16 onto the medium 15 supported by the support portion 14. The liquid ejection head 13 can be a serial type, ejecting liquid while moving and performing printing. Alternatively, the liquid ejection head 13 can be a line type, being arranged in a strip across the width of the medium 15 and ejecting liquid onto the transported medium 15 and performing printing.

[0029] The liquid ejection device 11 may include a supply flow path 17, a supply needle 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 storage bag 21 storing liquid.

[0030] Supply needle 18 is provided at the upstream end of supply channel 17. Tray 19 is detachably mounted on mounting portion 20. Tray 19 supports liquid storage bag 21. Specifically, liquid storage bag 21 is placed on tray 19. While placed on tray 19, liquid storage bag 21 is connected to supply needle 18 by mounting tray 19 on mounting portion 20.

[0031] The liquid storage bag 21 includes a bag body 22 and a supply unit 23. The liquid storage bag 21 may include an auxiliary unit 24. The bag body 22 can store liquid.

[0032] The supply unit 23 supplies the liquid contained in the bag 22 to the outside. The auxiliary unit 24 assists in connecting the supply unit 23 to the supply needle 18. The auxiliary unit 24 positions the supply unit 23 relative to the tray 19, thereby facilitating connection between the supply unit 23 and the supply needle 18 when the tray 19 is installed.

[0033] like Figure 1 As shown, the liquid storage bag 21 is, for example, an ink bag that stores ink as liquid. Ink as an example of a photosensitive liquid may be an ultraviolet curing ink.

[0034] Although Figure 1 , an example of a liquid ejecting device 11 having one mounting portion 20 is shown, but the liquid ejecting device 11 may also have a plurality of mounting portions 20. In this case, the plurality of liquid storage bags 21 mounted at the plurality of mounting portions 20 can store different types of liquids. The type of liquid may be, for example, the type of color. The plurality of liquid storage bags 21 may, for example, store colored inks of different colors. As different types of liquids, the plurality of liquid storage bags 21 store inks of different colors, such as cyan, magenta, yellow, and black. The liquid may be either a pigment ink or a dye ink. The liquid may also be a type of colorless transparent liquid, such as a coating liquid. In addition, in the case where the liquid ejecting device 11 is a structure capable of mounting a plurality of liquid storage bags 21, at least one liquid storage bag 21 may be a storage bag for enclosing a photosensitive liquid.

[0035] Structure of the liquid storage bag 21

[0036] Next, refer to Figure 2 , the structure of the liquid storage bag 21 is described. Figure 2 As shown, the bag body 22 constituting the liquid storage bag 21 is formed by folding a single film 31 in half with its peripheral edges overlapping, and then joining the overlapping peripheral edges. The bag body 22 includes two film portions 31A and 31B that are formed by folding the single film 31 in half and overlapping each other. Specifically, the bag body 22 includes a first film portion 31A and a second film portion 31B as two overlapping film portions formed by the single film 31.

[0037] The film 31 forming the material of the bag 22 is, for example, quadrilateral. Therefore, the bag 22 has a quadrilateral shape when viewed from above. The quadrilateral bag 22 includes four sides 24f, 24s, and 24r. Here, the side 24f of the bag 22 to which the supply unit 23 is fixed is defined as the front side, and the side 24r opposite the supply unit 23 is defined as the rear side. The four sides 24f, 24s, and 24r of the bag 22 include a front side 24f, a rear side 24r, and two left and right side sides 24s.

[0038] The rear edge 24r is a folded end 25 formed by folding a single film 31. The two side edges 24s and the front edge 24f are joined ends 26 formed by joining the first film portion 31A and the second film portion 31B on three sides. In other words, the bag body 22 has a folded end 25 along one edge 24r and three joined ends 26 along three sides 24s and 24f. The single folded end 25 is provided along the rear edge 24r. The three joined ends 26 are provided along the three sides 24s and 24f.

[0039] Thus, the bag body 22 has one or more folded ends 25 formed by folding a film 31 so that the peripheral portions overlap, and a joining end 26 formed by joining the films 31 to each other at the overlapping peripheral portions of the films 31. In the present embodiment, in particular, the bag body 22 is manufactured by folding a rectangular film 31 in half so that the peripheral portions overlap, and therefore has one folded end 25 and three joining ends 26. One folded end 25 is formed by the folded portion when a film 31 is folded in half so that the peripheral portions overlap. The three joining ends 26 are formed by joining the overlapping peripheral portions of the film 31, i.e., three side portions 24s and 24f. In addition, the bag body 22 of the present embodiment is a type without pleats (pleats / gussets).

[0040] The bag 22 stores a light-sensitive liquid that reacts with light. Therefore, the film 31 is a light-shielding film. The film 31 is formed of a material with high light-shielding properties. The film 31 is, for example, a laminated film. The film 31 may also include a light-shielding layer 40 (see Figure 5 The liquid storage bag 21 is formed by, for example, bonding a film 31 having a light shielding layer 40 to form a bag-shaped bag body 22, and sealing a photosensitive liquid in the bag body 22.

[0041] The photosensitive liquid may be a UV-curable liquid. In the case of ink, the photosensitive liquid may be, for example, UV-curable ink. UV-curable liquids harden through a chemical reaction caused by ultraviolet light. If part of the liquid in the liquid storage bag 21 hardens, the liquid cannot be properly supplied to the liquid ejection head 13. Even if the liquid can be supplied, the liquid ejection head 13 cannot eject the liquid properly. Therefore, light-shielding measures are required for the liquid storage bag 21.

[0042] However, if the film portions 31A and 31B formed by overlapping the film 31 at the three side portions 24s and 24f are joined only by heat welding, the end surface 31c of the film 31 (for example, see Figure 9) will still be exposed. The end face 31c refers to a cross-sectional surface of the film 31 as a laminated film cut with a surface parallel to the stacking direction. The end face 31c is a surface facing a direction that intersects with the direction in which the light-shielding layer 40 can block light. Therefore, there is a possibility that light can enter the bag body 22 from the end face 31c through the synthetic resin layer on the inner side compared to the light-shielding layer 40. Therefore, in this embodiment, the end face 31c is covered by the film 31 itself by making it contact with the surface of the film 31. In addition, its detailed structure will be described later.

[0043] In the prior art, the ends of the film are processed to form an extension portion that extends a portion of the outer layer including the light-shielding layer by a predetermined length. This extension portion is bent into a U-shape and heat-welded while covering the end face, thereby preventing the end face from being exposed. Therefore, special processing is required to form the extension portion at the end of the film. Furthermore, the conditions required to determine the optimal extension length of the extension portion, such as experimental or simulation calculations, require time and effort. Therefore, in this embodiment, the light-shielding properties of the joint end portion 26 including the end face 31c are improved by a method that does not require special processing of the film 31.

[0044] Regarding the structure of the joint end portion 26

[0045] Next, refer to Figure 3 、 Figure 4 , the structure of the joint end portion 26 will be described. Figure 3 The joining end portion 26 is shown as viewed from a direction along the edge of the bag body 22 . Figure 4 The cross section of the joint end portion 26 is shown along a plane perpendicular to the side portion.

[0046] like Figure 3 As shown, at the end of the bag body 22, two film portions 31A and 31B formed by folding the film 31 in half are in an overlapping state. The two film portions 31A and 31B joined at the joining end portion 26 are parts of a film 31 formed in an overlapping state by folding a film 31 in half. The two film portions 31A and 31B each have two surfaces. As the two surfaces, the two film portions 31A and 31B have an outer surface 31a and an inner surface 31b. The two film portions 31A and 31B form an enclosed space 34 (see Figure 5 ). The enclosed space 34 is a space for enclosing liquid.

[0047] Figure 3The outer surface 31a shown is the surface of the bag body 22 where external light shines. The outer surface 31a is the surface of the liquid storage bag 21 that is in contact with the atmosphere. The inner surface 31b is the surface where the two thin film portions 31A and 31B are joined at the edge. The inner surface 31b is the surface where the photosensitive liquid is sealed, which is formed by the portion inside the joined portion (see FIG. 3 ). Figure 5 When light enters from the end face 31c, the light may pass through the synthetic resin layer constituting the two thin film portions 31A and 31B and reach the enclosed space 34. Therefore, in this embodiment, by forming the joint end portion 26 into Figure 3 In the embodiment shown, the end surface 31c is covered with the surface of the film 31. That is, the end surfaces 31c of the two film portions 31A, 31B are covered with the surface of at least one of the two film portions 31A, 31B.

[0048] At least a portion of the engagement end 26 is Figure 3 In other words, the joint end portion 26 is formed by removing a portion of the three side portions 24s, 24f as the peripheral portion of the bag body 22. Figure 3 Here, "at least a portion" means all the joint ends 26. Figure 3 The manner shown may be such that only a portion of the end 26 is joined. Figure 3 In the latter case, Figure 3 The portion joined in the manner shown may be, for example, a portion excluding the supply portion 23, a portion excluding the supply portion 23 and a portion including the periphery thereof, or a portion excluding the front edge portion 24f.

[0049] like Figure 3 As shown, the joint end portion 26 is formed by covering both end surfaces 31c of the two thin film portions 31A and 31B with the surface of at least one of the two thin film portions 31A and 31B. Figure 3 As shown, the two end faces 31c can be covered by the surface of one of the two film parts 31A and 31B. In particular, the joint end portion 26 may be in a state where 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, and at least one of the two end portions of the two film parts 31A and 31B is rolled up. In this case, as shown in FIG. Figure 3 As shown in the example, it is also possible to roll up both ends of the two film portions 31A and 31B. In this case, Figure 3As shown in the example, the two ends of the two film portions 31A and 31B may be rolled up while the two films are overlapped, so that the two end surfaces 31c are covered by the outer surface 31a of one of the two film portions 31A and 31B. Figure 3 The illustrated joining end portion 26 is heat-welded in this rolled-in configuration.

[0050] like Figure 4 As shown, the main material of the film 31 is a synthetic resin material. The synthetic resin material is a thermoplastic synthetic resin material. The synthetic resin material is a synthetic resin material that can be melted at a predetermined heating temperature. By placing the two film parts 31A and 31B at the same temperature as shown in FIG. Figure 4 The rolled-in shape is heat-fused at a predetermined heating temperature to form Figure 3 、 Figure 4 The joint end 26 is shown. Figure 4 As shown, both end surfaces 31c of the two thin film portions 31A, 31B are covered by the outer surface 31a of one of the two thin film portions 31A, 31B. Therefore, at the joint end portion 26, the end surfaces 31c of the two thin film portions 31A, 31B are not exposed.

[0051] Before welding, the thermoplastic synthetic resin material capable of heat welding is exposed on the surfaces of the two film portions 31A and 31B, namely the outer surface 31a and the inner surface 31b. In addition, the thermoplastic synthetic resin material capable of heat welding is exposed on almost the entire area of ​​the two end surfaces 31c. Figure 4 The embodiment shown in FIG. 1 is heat-welded, and the inner surfaces 31b of the two thin film portions 31A and 31B, the outer surfaces 31a, and the end surface 31c and the outer surface 31a are heat-welded to each other via the synthetic resin material. The joint end portion 26 has a Figure 4 Therefore, the end faces 31c of the film portions 31A and 31B are not exposed to light. Figure 4 The light shielding layer 40 omitted in Figure 5 ) stacked structure.

[0052] Regarding the laminated structure of the thin film 31

[0053] Next, refer to Figure 5 , the laminated structure of the film 31 constituting the bag body 22 is described. Figure 5 As shown, the bag body 22 is formed of a single film 31. In the bag body 22, a sealed space 34 capable of sealing a liquid is formed by the single film 31.

[0054] like Figure 5As shown, 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 also 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.

[0055] The film 31 may include 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, stacked in order from the enclosed space 34 side. The thickness of the film 31 is the sum of the thicknesses of the layers 36 to 40. The thickness of the film 31 may be, for example, a predetermined value within the range of 0.08 to 0.2 mm. Alternatively, the thickness of the film 31 may be outside this range.

[0056] The light-shielding layer 40 can be an adhesive layer between the four layers 36, 37, 38, and 39. The adhesive layer serving as the light-shielding layer 40 bonds the layers 36, 37, 38, and 39. The light-shielding layer 40 can also be a printed layer formed of a black adhesive containing a black colorant. In other words, the light-shielding layer 40 can also be a black coating. As adhesives forming the light-shielding layer 40, polyurethane adhesives, ester adhesives, vinyl adhesives, epoxy adhesives, etc. can be used. Black colorants can include, for example, carbon, iron black, pine soot, etc. The black colorant can also be formed by mixing multiple colorants of different colors. The black colorant can also be formed on a layer by overlapping and applying multiple colorants of different colors on a layer. In addition, the light-shielding layer 40 formed of a black coating can also be formed as a layer different from the adhesive layer.

[0057] The base layer 36 can be formed from a heat-weldable synthetic resin such as nylon (Ny), polypropylene (PP), or polyethylene (PE). The base layer 36 can also be a mixture of two synthetic resins. For example, a mixture of nylon and polypropylene is possible. The synthetic resin used for the base layer 36 has excellent heat-sealing properties. The base layers 36 of the two film portions 31A and 31B are fused together, for example, by heat.

[0058] The intermediate resin layer 37 may be formed of nylon, which is resistant to oil and puncture, or may be formed of polypropylene or polyethylene.

[0059] The metal layer 38 can be formed of aluminum (Al). Aluminum can suppress the transmission of gas and ultraviolet rays. The thickness of the metal layer 38 can be set to a predetermined value within the range of 5 μm or more and 20 μm or less, for example. For the film 31, the thicker the metal layer 38 is, the higher the rigidity is, and the transmission of gas and ultraviolet rays can be suppressed. When the thickness of the metal layer 38 is too thin, for example, the strength of the liquid storage bag 21 may be insufficient with respect to the impact caused by falling, etc. On the other hand, when the thickness of the metal layer 38 is too thick, the film 31 may not be easily deformed, and liquid cannot be supplied from the liquid storage bag 21 under the capacity of the liquid ejection device 11, resulting in more liquid than expected remaining in the liquid storage bag 21. In addition, the thickness of the metal layer 38 is an example and can also be a value outside the above range.

[0060] Protective layer 39 is formed, for example, from nylon (Ny). Alternatively, protective layer 39 may be formed from polyethylene terephthalate (PET). In this case, PET may be formed with aluminum oxide vapor-deposited on the surface. PET vapor-deposited with aluminum oxide has barrier properties against oxygen and water vapor, and is resistant to shock and vibration.

[0061] The role of implementation methods

[0062] Next, refer to Figures 2 to 6 The function of the liquid storage bag 21 of this embodiment will be described.

[0063] The bag body 22 of the liquid storage bag 21 has four sides 24r, 24s, and 24f. One of the four sides 24r, 24s, and 24f of the bag body 22 is a folded end 25 formed by folding the film 31. Since the folded end 25 is an end without an end surface of the film 31, a high light-shielding property can be obtained. In addition, the three sides 24s and 24f are joined ends 26 formed by joining the ends of the two film parts 31A and 31B. The joined ends 26 are formed by keeping Figure 3 、 Figure 4 The end surface 31c, which is likely to cause light to enter, is covered by the outer surface 31a. In other words, the end surface 31c is covered by the film 31. Therefore, the joint end portion 26 can obtain high light shielding properties.

[0064] like Figure 5 、 Figure 6 As shown, in the film 31 of this embodiment, the light shielding layer 40 is located between the base layer 36 and the metal layer 38. Assuming that there is no light shielding layer 40 between the base layer 36 and the metal layer 38, at the junction of the two film portions 31A and 31B, the two metal layers 38 face each other with the two base layers 36 sandwiched therebetween. For example, Figure 6As shown by the two-dot chain line, light slightly incident from the joint end 26 repeatedly reflects between the two metal layers 38 and reaches the photosensitive liquid in the sealed space 34. In this case, the liquid is easily hardened by the tiny amount of light that has entered the sealed space 34.

[0065] On the other hand, 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 bonding end portion 26, the light will be shielded by the light shielding layer 40. Therefore, the small amount of light that enters will not reach the metal layer 38. Figure 6 As shown by the dashed line, a small amount of light entering from the joint end portion 26 is absorbed by the light shielding layer 40. Therefore, even if a small amount of light enters from the joint end portion 26, this small amount of light will not reach the liquid in the sealed space 34. Therefore, the light shielding property of the liquid storage bag 21 is further improved, and the hardening of the liquid in the sealed space 34 can be further suppressed.

[0066] Manufacturing method

[0067] Next, refer to Figures 7 to 10 The manufacturing method of the liquid storage bag 21 is described below. The manufacturing method of the liquid storage bag 21 manufactures the liquid storage bag 21 as follows. The liquid storage bag 21 includes a bag body 22 formed by joining a film 31 to form a bag shape, and a supply unit 23 capable of supplying the liquid sealed inside the bag body 22. A light-shielding 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 manufacturing method of the liquid storage bag 21 includes the following two steps (a) and (b).

[0068] (a) A single film 31 is folded in half with its peripheral edges overlapping to form a single folded end portion 25 .

[0069] (b) The joined end portion 26 is formed by joining the overlapping peripheral edge portions.

[0070] In (b), at least a portion of the joined end portion 26 is formed by joining two thin film portions 31A, 31B overlapping at the peripheral edge so that both end surfaces 31c are covered by the surface of at least one of the thin film portions 31A, 31B.

[0071] The method for manufacturing the liquid storage bag 21 primarily consists of four steps. The first step (a) involves folding a single film 31 in half to form a folded end portion 25. The second step (b) involves joining the peripheral edges of the two film portions 31A and 31B, namely, the three sides 24s and 24f. Prior to this joining, the supply portion 23 is sandwiched between the front side sides 24f.

[0072] The film 31 is prepared by being cut into a predetermined size and a predetermined quadrilateral shape capable of forming the bag body 22. That is, the film 31 for forming the bag body 22 from the raw film is formed by cutting.

[0073] First step (a)

[0074] like Figure 7 As shown, a film 31 is folded in half. Using a creasing machine or the like, the film 31 is folded in half so that the peripheral edges overlap. The folded end portion 25 is formed by the folding.

[0075] like Figure 8 As shown, after a film 31 is folded in half, the base of the supply portion 23 is sandwiched at the center of the front side 24f. The supply portion 23 can also be placed relative to the film 31 before the film 31 is folded in half. Figure 9 As shown, the two film portions 31A and 31B folded in half are in a state of overlapping at three side portions 24s and 24f.

[0076] Second step (b)

[0077] The second step (b) may also include forming Figure 10 The step (b1) of the winding form shown and the step (b2) of the winding form shown Figure 10 The step (b2) of welding is performed while the rolled-in shape is shown.

[0078] like Figure 9 As shown, at the three sides 24s and 24f, the two end faces 31c of the two thin film parts 31A and 31B are exposed. In step (b1), the two end faces 31c are covered with the outer surface 31a of one of the two thin film parts 31A and 31B. In this embodiment, a film is formed so that the end faces 31c can be covered with the outer surface 31a. Figure 10 That is, by rolling up the ends of the two film portions 31A and 31B, the end surface 31c is covered by the outer surface 31a. Figure 10 The form shown.

[0079] In maintaining Figure 10 In this case, the three sides 24s and 24f can be joined by heat welding in one time. However, if heat welding is difficult in one time, heat welding can be repeated three times for each side. In addition, the heat welding process (b2) can be divided into two processes. For example, Figure 9 In the state shown, the side portions 24s and 24f are heat-welded. This welding forms the enclosed space 34. This welding is also temporary welding before forming the joint end portion 26.

[0080] Next, if Figure 10 As shown, by rolling up the ends of the two film portions 31A and 31B, a Figure 10 And, next, while maintaining Figure 10 The side portions 24s and 24f are heat-welded while the side portions 24s and 24f are heat-welded. Heat-welding can also be heat-pressing while applying pressure in the joining direction. In the case of heat-pressing, in order to Figure 10 The shape shown does not collapse, and can also be Figure 10 The shown shape is housed in a concave mold and then thermocompression bonded.

[0081] The base layer 36, the intermediate resin layer 37 and the protective layer 39 constituting the film 31 are heat-fused by heating at a predetermined heating temperature during heat welding. The edges 24s and 24f of the two film parts 31A and 31B are pressurized in the heat-fused state. Figure 10 The state shown is pressurized in the thickness direction and heat-welded. Figure 10 The illustrated form is slightly flattened in the thickness direction due to the pressurization, but the end surface 31c is still covered by the outer surface 31a. Therefore, the end surface 31c is covered by the outer surface 31a at the joint end 26 of the three sides 24s and 24f.

[0082] A photosensitive liquid is then injected into the thus-manufactured liquid storage bag 21 from the supply unit 23. In the thus-manufactured liquid storage bag 21, one side 24r is a folded end 25, providing a higher light-shielding property than the joint ends 26 formed on the other three sides 24s and 24f. While the three sides 24s and 24f have end surfaces 31c through which light can relatively easily enter, these end surfaces 31c are covered by the outer surface 31a. In other words, the end surfaces 31c are covered by the film 31. Therefore, high light-shielding properties are also ensured for the joint ends 26.

[0083] Effects of implementation methods

[0084] Therefore, according to this embodiment, the following effects can be obtained.

[0085] (1) The liquid storage bag 21 includes a bag body 22 and a supply portion 23. The bag body 22 is formed into a bag shape by joining a film 31. The supply portion 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-shielding film. The liquid is a photosensitive liquid. The bag body 22 has one or more folded ends 25 and a joining end 26. The one or more folded ends 25 are formed by folding a film 31 so that the peripheral portions overlap. The joining end 26 is formed by joining the films 31 to each other at the overlapping peripheral portions of the films 31. At least a portion of the joining end 26 is joined in a manner such that the two end faces 31c of the two film portions 31A and 31B overlapping at the peripheral portions are covered by the surface of at least one of the two film portions 31A and 31B. According to this structure, one or more side portions of the bag body 22 are folded ends 25 formed by folding the film 31. Therefore, compared to a bag body formed of two films and having a joint end portion with end faces 31c located throughout the entire circumference, the light-shielding properties of the bag body 22 can be improved. Moreover, since at least a portion of the joint end portion 26 is covered by the light-shielding film 31 at both end faces 31c of the two film portions 31A and 31B, high light-shielding properties can also be obtained for the joint end portion 26. In addition, since the film 31 is directly used to cover the end face 31c, special processing such as extending a portion of the film 31 layer is not required. Therefore, a liquid storage bag 21 with high light-shielding properties can be provided with a simple structure. In addition, as an example of a photosensitive liquid, an ultraviolet curing liquid can be cited.

[0086] (2) The bag body 22 has a folded end 25 formed by folding a rectangular film 31 in half with its peripheral edges overlapped, and three joined ends 26 formed by joining the films 31 to each other at the overlapping peripheral edges, i.e., the three sides. This structure allows the bag body 22 to be formed using only one film 31. Therefore, the liquid storage bag 21 can be manufactured simply.

[0087] (3) The two film portions 31A and 31B have outer surfaces 31a and inner surfaces 31b as their surfaces. By joining the respective inner surfaces 31b at the periphery, a sealed space 34 for enclosing liquid is formed. The configuration is such that at least one of the ends of the two film portions 31A and 31B is rolled up, with both end surfaces 31c being covered by at least one of the outer surface 31a and inner surface 31b of the film 31. This configuration improves the light-shielding properties of the bag 22 by covering both end surfaces 31c of the joined end portion 26 with the film 31.

[0088] (4) The configuration is one in which both ends of the two film portions 31A and 31B are rolled in. With this configuration, both end faces 31c of the joint end portion 26 are covered with the film 31, thereby improving the light shielding property of the bag body 22.

[0089] (5) The configuration is such that the ends of the two film portions 31A and 31B are rolled up while being overlapped, with both end surfaces 31c being covered by the outer surface 31a of the film 31. This configuration covers both end surfaces 31c of the joint end portion 26 with the film 31, thereby improving the light-shielding properties of the bag 22. Since the ends of the two film portions 31A and 31B are rolled up while being overlapped, the bag can be manufactured more simply than if the ends were rolled up separately.

[0090] (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 is in contact with the sealed space 34 containing the liquid. The light-shielding layer 40 is located between the base layer 36 and the protective layer 39. According to this structure, the bag body 22 can obtain high light-shielding properties due to the presence of the light-shielding layer 40 constituting the film 31. At the joint end 26, the two end faces 31c of the two film portions 31A and 31B are covered by the surfaces of the film portions 31A and 31B, and are thus covered by the light-shielding layer 40 via the base layer 36. Therefore, the two end faces 31c are shielded from light.

[0091] (7) The film 31 is a laminated film including a metal layer 38 positioned between a base layer 36 and a protective layer 39. This structure provides a high light-shielding function and a high air-proof function (gas barrier function). Therefore, while protecting the liquid in the liquid storage bag 21 from exposure to ultraviolet light and other light, it is also possible to suppress degradation of the liquid quality caused by gas entering from outside through the film 31. For example, it is possible to suppress the formation of bubbles in the liquid in the bag 22 from gas such as air that has passed through the film 31.

[0092] (8) At least one light-shielding layer 40 is located between the base material layer 36 and the metal layer 38. Regarding light-shielding properties, in the film 31 in which the light-shielding layer 40 is not located between the base material layer 36 and the metal layer 38, a small amount of light entering from the joint end 26 of the liquid storage bag 21 enters the interior (enclosed space 34) of the liquid storage bag 21 while being repeatedly reflected between the metal layers 38 that may be located at positions opposing each other. According to this structure, the light-shielding layer 40 is located between the metal layers 38 that are located at positions opposing each other at the joint portion of the bag body 22. Therefore, the light-shielding layer 40 can prevent the light entering from the joint end 26 of the bag body 22 from being repeatedly reflected between the metal layers 38 that are located at positions opposing each other. Therefore, a liquid storage bag 21 having both higher light-shielding properties and high gas barrier properties can be provided with a simple structure.

[0093] (9) A method for manufacturing a liquid storage bag 21 comprising a bag body 22 formed into a bag shape by bonding a film 31, and a supply unit 23 capable of supplying a liquid enclosed within the bag body 22. The film 31 forming the bag body 22 is a light-shielding film. The liquid is a photosensitive liquid. This manufacturing method comprises the following (a) and (b).

[0094] (a) One or more folded end portions 25 are formed by folding a single film 31 so that the peripheral edges overlap.

[0095] (b) The joined end portion 26 is formed by joining the overlapping peripheral edge portions.

[0096] In the above-described method (b), a portion of the joined end portion 26 is formed by joining the two overlapping film portions 31A and 31B at their peripheral edges so that both end surfaces 31c are covered by the surface of at least one of the film portions 31A and 31B. This manufacturing method provides a liquid storage bag 21 with a simple structure and high light-shielding properties.

[0097] Change Example

[0098] Furthermore, the above embodiment can also be modified as in the following modified examples. Furthermore, the above embodiment and the following modified examples can be appropriately combined to form further modified examples, and the following modified examples can also be appropriately combined to form further modified examples.

[0099] The bag body 22 of the liquid storage bag 21 can also be used Figure 11 Although the film 31 of the first embodiment includes a metal layer 38, it can also be made as shown in FIG. Figure 11 The film 31 shown does not include the metal layer 38. Figure 11 In the example shown, the film 31 has a base layer 36, a light-shielding layer 40, an intermediate resin layer 37, a light-shielding layer 40, and a protective layer 39 stacked in order from the side of the enclosed space 34. The film 31 includes two light-shielding layers 40. The base layer 36 can be formed of a synthetic resin that can be heat-fused, such as polyethylene (PE). The base layer 36 can also be formed of nylon (Ny) or polypropylene (PP). The base layers 36 of the two film portions 31A and 31B are fused to each other, for example, by heat. The intermediate resin layer 37 can be formed of nylon. The protective layer 39 can be formed of polyethylene terephthalate (PET), for example. The protective layer 39 can also be formed of nylon (Ny).

[0100] The liquid storage bag 21 may be a pleated type having a hem 29 with folds 28. Figure 12As shown, the liquid storage bag 21 includes a bag body 22 and a supply portion 23. The bag body 22 can store liquid. The bag body 22 is formed by joining a single film 31 and two second films 32 at their respective ends. In this case, the folded end 25 is formed by folding the single film 31 in half so that the film 31 overlaps at its peripheral edges. The joined end 26 is formed by joining the film 31 to the other films 32 at the overlapping peripheral edges of the film 31, namely, the three edges 24s and 24f. The two edges of the single film 31 that overlap vertically with a gap are located opposite each other. The upper peripheral edge of the film 31 and the upper edge of the second film 32 are joined at their respective ends to form the joined end 26 at the upper edge 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 to form the joined end 26 at the lower edge 24s. This creates a hem 29 on one side. The hem 29 on the other side is formed by joining the second film 32 to the film 31 at the upper side 24s and the lower side 24s to form a joined end portion 26. A portion of the front side 24f is formed by joining the first film and the second film 32 at the side 24f to form a joined end portion 26. Figure 3 It is welded in the form shown.

[0101] ·like Figure 13 As shown, the joint end portion 26 may be formed by rolling the ends of the two film portions 31A and 31B together in a roll-like manner while the two films are overlapped. The end surfaces 31c of the two film portions 31A and 31B rolled together are covered by the outer surface 31a of one of the film portions 31A and 31B. As long as the end surface 31c is covered by the outer surface 31a, the film portions may be rolled together in a roll-like manner while the two films are overlapped.

[0102] ·like Figure 14 As shown, the joint end portion 26 may also be formed by rolling the ends of the two film portions 31A and 31B around the film portions 31A and 31B, respectively. By rolling the ends of the two film portions 31A and 31B in opposite directions, the end surfaces 31c of each film portion are covered by its outer surface 31a. In other words, the end surface 31c of the first film portion 31A is covered by the outer surface 31a of the first film portion 31A, and the end surface 31c of the second film portion 31B is covered by the outer surface 31a of the second film portion 31B.

[0103] ·like Figure 15As shown, the joint end portion 26 can also be configured by rolling the ends of the two film portions 31A and 31B around the film portions 31A and 31B, respectively. By rolling the ends of the two film portions 31A and 31B in opposite directions, the end surfaces 31c of each film portion are covered by its own inner surface 31b. In other words, the end surface 31c of the first film portion 31A is covered by the inner surface 31b of the first film portion 31A, and the end surface 31c of the second film portion 31B is covered by the inner surface 31b of the second film portion 31B.

[0104] ·like Figure 16 As shown, the joint end portion 26 may be formed by rolling up only the end of one of the two thin film portions 31A and 31B so as to cover the end surface 31c of the other. In this case, the end surface 31c of the thin film portion 31A rolled up so as to cover the end surface 31c of the other is covered by the outer surface 31a of the thin film portion 31B. Figure 16 In the example shown, the first film portion 31A is rolled up with the end surface 31c of the second film portion 31B covering the end surface 31c. However, the second film portion 31B may be rolled up with the end surface 31c of the first film portion 31A covering the end surface 31c. Figure 16 In the example shown, 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 end surface 31c of the first film portion 31A may be covered by its inner surface 31b by rolling the top end of the first film portion 31A into a roll.

[0105] Although Figure 3 In the illustrated example, both end surfaces 31c of the two film portions 31A and 31B are covered with the outer surface 31a of the second film portion 31B at the joint end portion 26. However, the outer surface 31a of the first film portion 31A may be used instead.

[0106] The shape of the bag body 22 when viewed from above is not limited to a quadrilateral. In other words, the shape of a single film 31 is not limited to a quadrilateral. For example, a semicircular bag body 22 can be formed by folding a circular or oval film 31 in half.

[0107] The number of sides formed by folding a single 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 storage bag 21 can be manufactured by folding a single rectangular film 31 so that the two side edges 24s form the folded ends 25.

[0108] Photosensitive liquids are not limited to UV-curable liquids. They can also react to visible light. The reaction of a liquid to light is not limited to curing. Liquids that change color in response to light can also be used. Thus, the properties of photosensitive liquids that change upon exposure to light can include properties other than curing.

[0109] 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 also be formed of stainless steel, copper, gold, silver, tin, platinum, or the like.

[0110] The joining of the joint end portion 26 is not limited to welding, and may also be a joining using an adhesive. Figure 3 、 Figures 13 to 16 In the shown form, the components are bonded together using an adhesive.

[0111] The film welding is not limited to heat welding, and may be welded by other welding methods such as high-frequency welding and ultrasonic welding.

[0112] The rolling direction of the form at the joint end portion 26 may be either the outside or the inside, but is preferably the same for the three sides.

[0113] The photosensitive liquid enclosed in the liquid storage bag is not limited to UV-curable ink. It can also be a UV-curable liquid other than ink. For example, it can also be a liquid that changes color when irradiated with visible light or infrared light.

[0114] Photosensitive liquids are not limited to light-curing liquids. Photosensitive liquids may also be liquids that undergo chemical reactions upon exposure to light, causing changes in properties or morphology other than curing.

[0115] The liquid storage bag 21 is not limited to printing applications. The liquid storage bag 21 may be a storage bag in which a photosensitive liquid used for applications other than printing is sealed in the bag body 22 .

[0116] The liquid ejection device 11 may also be a liquid ejection device that ejects liquids other than ink. In addition, the state of the liquid ejected from the liquid ejection device in the form of a small amount of droplets also includes granular, tear-shaped, and linear tail states. The liquid mentioned here can be any material that can be ejected from the liquid ejection device. For example, the liquid can be any liquid in the state of the substance in the liquid phase, including fluid bodies such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, and liquid metals (metal melts). Liquids are not only liquids in a state of matter, but also include liquids in which particles of functional materials composed of solid objects such as pigments or metal particles are dissolved, dispersed, or mixed in a solvent. Representative examples of liquids include inks and liquid crystals as described in the above embodiments. Here, inks include general water-soluble inks, oil-based inks, and various liquid composition substances such as colloid inks and hot melt inks. As a specific example of a liquid ejecting device, for example, it can be a device that ejects a liquid containing a material such as an electrode material or a color material used in the manufacture of liquid crystal displays, EL (electroluminescent) displays, surface-emitting displays, and color filters in a dispersed or dissolved form. The liquid ejecting device can also be a device that ejects biological organic matter used in the manufacture of biochips, a device that is used as a precision pipette and ejects a liquid that becomes a sample, a printing and dyeing device, or a micro-dispenser. The liquid ejecting device can also be a device that accurately ejects lubricating oil to precision equipment such as clocks or cameras, or a device that ejects a transparent resin liquid such as an ultraviolet curing resin onto a substrate in order to form a tiny hemispherical lens (optical lens) used in optical communication elements. The liquid ejecting device can also be a device that ejects an etching liquid such as an acid or alkali in order to etch a substrate. The liquid storage bag 21 having the structure of the above-mentioned embodiment or modified example can also be applied to such a liquid ejecting device.

[0117] Notes

[0118] Hereinafter, technical ideas and effects grasped from the above-described embodiment and modified examples will be described together.

[0119] (A) A liquid storage bag comprises a bag body formed by joining films to form a bag shape and a supply portion capable of supplying liquid sealed inside the bag body, the film forming the bag body is a light-shielding film, the liquid is a photosensitive liquid, and the bag body has: one or more folding ends formed by folding a sheet of the film so that the peripheral portions overlap; a joining end formed by joining the films to each other or to other films at the overlapping peripheral portions of the films, at least a portion of the joining end being joined in a manner such that the two end faces of the two film portions overlapping at the peripheral portions are covered by the surface of at least one of the two film portions.

[0120] According to this structure, one or more sides of the bag body are folded ends formed by folding the film. Therefore, compared with a bag body formed by two films and having a joint end with end faces located around the entire circumference, the light-shielding property of the bag body can be improved. Moreover, since at least a portion of the joint end is covered with the light-shielding film at both end faces of the two film parts, high light-shielding property can also be obtained for the joint end. In addition, since the film is directly used to cover the end face, there is no need for special processing such as extending a part of the film layer. Therefore, a liquid storage bag with high light-shielding property can be provided with a simple structure. In addition, as an example of a photosensitive liquid, an ultraviolet curing liquid can be cited.

[0121] (B) In the liquid storage bag described in (A) above, the bag body may also have a folded end portion formed by folding a rectangular film in half with its peripheral edges overlapping, and three joined end portions formed by joining the films together at the overlapping peripheral edges, i.e., three sides. This structure allows the bag body to be formed from a single film. Therefore, the liquid storage bag can be manufactured simply.

[0122] (C) In the liquid storage bag described in (A) or (B) above, the two film portions may have outer and inner surfaces as the surfaces, and the inner surfaces of the two film portions are joined at the peripheral edge to form a sealed space for enclosing the liquid. The configuration is such that at least one of the end portions of the two film portions is rolled up so that both end surfaces are covered by at least one of the outer and inner surfaces of the film. With this configuration, since both end surfaces of the joined end portions are covered by the film, the light-shielding properties of the bag are improved.

[0123] (D) In ​​the liquid storage bag described in (C) above, the configuration may be such that both ends of the two film portions are rolled in. With this configuration, since both end surfaces of the joined ends are covered with the film, the light-shielding properties of the bag are improved.

[0124] (E) In the liquid storage bag described in (D) above, the two film portions may be rolled up with both ends overlapping each other so that both end surfaces are covered by the outer surface of the film. This configuration improves the light-shielding properties of the bag because both end surfaces of the joined ends are covered by the film. Rolling up the two film portions while maintaining their overlap allows for simpler manufacturing compared to rolling up the two film portions individually.

[0125] (F) In the liquid storage bag described in any one of (A) to (E) above, the film may be a laminated film comprising the following layers: a base layer in contact with the enclosed space enclosing the liquid; a protective layer; and at least one light-shielding layer located between the base layer and the protective layer. According to this structure, the bag body can obtain high light-shielding properties due to the presence of the light-shielding layer constituting the film. At the joined end portions, the two end faces of the two film portions are covered by the light-shielding layer via the base layer by being covered by the surface of the film portion, and thus the two end faces are shielded from light. Therefore, a liquid storage bag with high light-shielding properties can be provided with a simple structure.

[0126] (G) In the liquid storage bag described in (F) above, the film may be a laminated film including a metal layer positioned between the base layer and the protective layer. This structure provides both high light-shielding and high air-permeation resistance (gas barrier) capabilities. Thus, while protecting the liquid within the liquid storage bag from ultraviolet light and other light, it can also suppress degradation of the liquid's quality caused by gas entering through the film from the outside.

[0127] (H) In the liquid storage bag described in (G) above, the following method may be adopted, that is, at least one layer of the light-shielding layer is located between the base material layer and the metal layer. In a film in which there is no light-shielding layer between the base material layer and the metal layer, a small amount of light entering from the joint end of the liquid storage bag may enter the interior (enclosed space) of the liquid storage bag while being repeatedly reflected between the metal layers located at positions opposite to each other. According to this structure, the light-shielding layer is located between the metal layers located at positions opposite to each other at the joint portion of the bag body. Therefore, the light-shielding layer can prevent the small amount of light entering from the joint end of the bag body from being repeatedly reflected between the metal layers located at positions opposite to each other. Therefore, a liquid storage bag having both higher light-shielding properties and high gas barrier properties can be provided with a simple structure.

[0128] (H) A method for manufacturing a liquid storage bag, the liquid storage bag comprising a bag body formed by joining films to form a bag shape, and a supply portion capable of supplying a liquid to be enclosed within the bag body, the film forming the bag body being a light-shielding film, and the liquid being a photosensitive liquid, the method comprising: (a) forming one or more folded end portions by folding a sheet of the film so that its peripheral edges overlap; and (b) forming joined end portions by joining the overlapping peripheral edges, wherein a portion of the joined end portions is formed by joining the two film portions overlapping at the peripheral edges so that both end surfaces of the two film portions overlap at the peripheral edges are covered by the surface of at least one of the film portions. According to this manufacturing method, a liquid storage bag with high light-shielding properties can be provided with a simple structure.

[0129] Explanation of symbols

[0130] 11…liquid ejection device; 12…housing; 13…liquid ejection head; 14…support portion; 15…medium; 16…nozzle; 17…supply flow channel; 18…supply needle; 19…tray; 20…mounting portion; 21…liquid storage bag; 22…bag body; 23…supply portion; 24…auxiliary portion; 24f…edge (front edge); 24r…edge (rear edge); 24s…edge (side edge); 25…folded end portion; 26…joining end portion; 28…crease; 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 storage bag, characterized in that: The invention comprises a bag body formed by joining films together to form a bag shape, and a supply unit capable of supplying a liquid sealed in the bag body. The film forming the bag body is a light-shielding film. The liquid is a photosensitive liquid. The bag body has: one or more folded end portions formed by folding a sheet of the film so that the peripheral edges overlap; a joining end portion formed by joining the films to each other or to another film at the overlapping peripheral edge portions of the films, At least a portion of the joining end portions is joined such that both end surfaces of the two thin film portions overlapping at the peripheral portion are covered by a surface of at least one of the two thin film portions.

2. The liquid storage bag according to claim 1, wherein: The bag body has: a folded end portion formed by folding a sheet of the film having a quadrilateral shape in half with the peripheral edges overlapping; Three joined end portions are formed by joining the films to each other at the overlapping peripheral portions, ie, three side portions of the films.

3. The liquid storage bag according to claim 1, wherein: The two film portions have an outer surface and an inner surface as the surfaces, and the inner surfaces of the two film portions are joined at the peripheral portion to form a sealed space for sealing the liquid. The embodiment is a embodiment in which at least one of the end portions of the two film portions is rolled up so that both end surfaces are covered by at least one of the outer surface and the inner surface of the film.

4. The liquid storage bag according to claim 3, wherein: The above-mentioned configuration is a configuration in which both end portions of the two film portions are rolled up.

5. The liquid storage bag according to claim 4, wherein: The embodiment is a embodiment in which both end portions of the two film portions are rolled up while being overlapped so that both end surfaces are covered by the outer surface of the film.

6. The liquid storage bag according to claim 1, wherein: The film is a laminated film comprising the following layers, namely: a substrate layer in contact with the enclosed space enclosing the liquid; protective layer; At least one light-shielding layer is located between the substrate layer and the protective layer.

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

8. The liquid storage bag according to claim 7, wherein: At least one of the light-shielding layers is located between the substrate layer and the metal layer.

9. A method for manufacturing a liquid storage bag, characterized in that: The liquid storage bag includes a bag body formed by joining films together to form a bag shape, and a supply unit capable of supplying the liquid sealed in the bag body. The film forming the bag body is a light-shielding film. The liquid is a photosensitive liquid. The manufacturing method of the liquid storage bag comprises: (a) forming one or more folded end portions by folding a sheet of the film so that the peripheral edges overlap; (b) forming a joined end portion by joining the overlapping peripheral portions, In the above (b), a part of the joined end portion is formed by joining the two thin film portions overlapping at the peripheral portion so that both end surfaces are covered by a surface of at least one of the two thin film portions.

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