Manufacturing method of spout

Abstract

To provide a spouting tool having excellent oxygen barrier property.SOLUTION: A manufacturing method of a synthetic resin spouting tool 1 fitted to an opening of a container for accommodating a fluid in its inside includes: a mounting step of inserting a bottomed cylindrical lid body part 41 into an inside of a cylindrical spouting part 2 forming a channel C of the fluid; and a heating step of heating an undersurface 32a of the spouting part 2 and a bottom surface 45a of the lid body part 41. In the heating process, an inner periphery of the undersurface 32a of the spouting part 2 and an outer periphery of the bottom surface 45a of the lid body part 41 are welded and integrated together, and a gas barrier sheet 5 is attached to the undersurface 32a of the spouting part 2 and the bottom surface 45a of the lid body part 41.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a synthetic resin spout that is attached to the opening of a container that contains a fluid therein. [Background technology]

[0002] A spout is known that is attached to the opening of a container such as a packaging bag. The spout is configured to prevent outside air from entering the container through a flow path formed inside the spout. For example, Patent Document 1 discloses a spout device including a spout that forms a fluid flow path therein and a cap that is detachably attached by screwing onto the spout's inner cylindrical body. The spout and cap have the following structures: The spout has a cylindrical inner cylindrical body and a container connecting tube that is integrally connected to the lower part of the inner cylindrical body. The container connecting tube has a cylindrical base that is integrally connected to the inner cylindrical body and a protruding piece that protrudes radially from the outer surface of the cylindrical base. The cap has a bottomed cylindrical plug that is inserted into the spout's inner cylindrical body and cylindrical base to close the flow path inside the spout.

[0003] In the spout device described in Patent Document 1, the outer surface of the plug of the cap adheres tightly to the inner surface of the cylindrical base of the spout, blocking the flow path inside the spout. This is said to prevent oxygen that has permeated through the outer surface of the inner cylindrical main body from flowing axially inside the inner cylindrical main body and into the container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-90271 Summary of the Invention [Problem to be solved by the invention]

[0005] However, it is not possible to block the flow of oxygen inside the inner cylindrical main body and the cylindrical base. Therefore, even if it is possible to limit the amount of oxygen flowing inside the cylindrical base, there is a limit to how far this can be limited. From the viewpoint of oxygen barrier properties, there is still room for improvement.

[0006] The present invention has been made in view of the above-mentioned conventional circumstances, and its object is to provide a method for manufacturing a spout device that has excellent oxygen barrier properties. [Means for solving the problem]

[0007] In order to solve the above problems, a method for manufacturing a spout device is a method for manufacturing a spout device made of synthetic resin that is attached to the opening of a container that stores a fluid therein, and includes an attachment step of inserting a cylindrical lid main body with a bottom into the inside of a cylindrical spout that forms a flow path for the fluid, and a heating step of heating the underside of the spout part and the bottom surface of the lid main body, wherein in the heating step, the inner periphery of the underside of the spout part and the outer periphery of the bottom surface of the lid main body are welded together to form a single unit, and a gas barrier sheet is attached to the underside of the spout part and the bottom surface of the lid main body.

[0008] In order to solve the above problems, furthermore, in the heating process, the gas barrier sheet is placed between the spout device and a crimping jig equipped with a heat welding means and heat welding is performed, so that the inner periphery of the lower surface of the spout portion and the outer periphery of the bottom surface of the lid main body portion are welded together and integrated, and the gas barrier sheet is attached to the lower surface of the spout portion and the bottom surface of the lid main body portion. [Effects of the Invention]

[0009] According to the present invention, a spout device with excellent oxygen barrier properties can be obtained. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a perspective view of the spout device of the present embodiment. [Figure 2] FIG. [Figure 3] 3A to 3C are explanatory diagrams showing the steps of manufacturing the spout device of the present embodiment in order. DETAILED DESCRIPTION OF THE INVENTION

[0011] The synthetic resin spout 1 shown in Figure 1 is attached to the opening of a synthetic resin bag-shaped container. This forms a flow path for pouring out the fluid contained inside the bag-shaped container. The spout 1 is adhesively fixed to the opening of the bag-shaped container by heat sealing. The bag-shaped container is formed from a multilayer sheet in which an aluminum foil layer is laminated between multiple thin polyethylene sheets. In the following explanation, the top, bottom, left, and right in Figure 1 will be referred to as the top, bottom, left, and right of the spout 1.

[0012] As shown in Figures 1 and 2, the synthetic resin spout device 1 includes a spout portion 2 that forms a fluid flow path C therein, a lid portion 4 that is detachably attached to the spout portion 2 by screwing it into place, and a sheet body 5 that serves as a gas barrier layer.

[0013] (Configuration of the dispensing section 2) 2, the dispensing part 2 has a flow path C formed therein. The dispensing part 2 has a cylindrical tube main body 20 formed over the entire length of the dispensing part 2, and an attachment part 30 formed integrally with the tube main body 20 at the bottom of the tube main body 20.

[0014] The inner peripheral surface of the tube main body 20 is formed in a straight shape with no change in diameter in the vertical direction, and is formed as a flat surface without any irregularities, which prevents the fluid from adhering to or remaining on the inner peripheral surface of the tube main body 20 that forms the flow path C when the fluid is poured out from inside the bag-shaped container.

[0015] A male screw 21 is formed to extend circumferentially on the outer peripheral surface of the upper part of the tube main body 20. In addition, a radially protruding annular protrusion 22 is formed over the entire circumference on the outer peripheral surface of the vertically middle part of the tube main body 20. Furthermore, a plurality of ratchets 23 are formed on the upper part of the annular protrusion 22.

[0016] As shown in FIGS. 1 and 2 , the attachment portion 30 is formed at the lower part of the tube main body 20 in a shape that protrudes radially outward from the outer circumferential surface of the tube main body 20. The attachment portion 30 is formed by a plurality of ribs that are elongated in the left-right direction when viewed from above. The plurality of ribs are composed of an upper wall 31 provided on the upper side, a lower wall 32 provided on the lower side, and a plurality of intermediate walls 33 provided between the upper wall 31 and the lower wall 32. The upper wall 31, the lower wall 32, and the intermediate wall 33 have the same shape and size, extend parallel to each other, and each side surface is flush in the vertical direction. The side surfaces of the upper wall 31, the lower wall 32, and the intermediate wall 33 are portions to which the opening of the bag-shaped container is adhesively fixed by heat sealing, and are formed as flat surfaces without any irregularities. The lower surface 32a of the lower wall 32 and the bottom surface 45a of the lid main body 41 of the lid part 4 are surfaces to which the sheet member 5 is attached in the gas barrier layer forming step described later, and are each formed as a flat surface that is horizontal in the left-right direction and has no irregularities. The upper wall 31, the lower wall 32, and the intermediate wall 33 are integrally connected by a connecting wall 34 that extends in the left-right direction between the upper wall 31, the lower wall 32, and the intermediate wall 33.

[0017] (Configuration of lid part 4) As shown in Figures 1 and 2, the lid portion 4 includes a cylindrical lid main body portion 41 with a bottom that is inserted inside the pouring portion 2, a flange portion 42 that extends radially outward from the upper end of the lid main body portion 41, and an outer tube portion 43 that extends downward from the outer end of the flange portion 42.

[0018] 2, lid main body 41 is formed as a hollow body including a cylindrical peripheral wall 44 and a bottom wall 45 provided on the lower edge of peripheral wall 44. The upper surface of lid main body 41 is open. As lid main body 41 is inserted into tube main body 20 of spout 2, bottom wall 45 of lid main body 41 closes flow path C of tube main body 20.

[0019] The inner peripheral surface of the peripheral wall 44 of the lid main body 41 is formed in a straight shape with a diameter that does not change in the vertical direction. In addition, a protrusion 46 that protrudes in the radial direction is formed around the entire circumference at the upper part of the outer peripheral surface of the peripheral wall 44, and the lower end of the protrusion 46 is formed as a tapered surface 46a that decreases in diameter toward the bottom. The outer peripheral surface of the peripheral wall 44 is formed in a straight shape with a diameter that does not change in the vertical direction in the part where the protrusion 46 is not formed, and its inner peripheral surface is formed as a flat surface with no irregularities. The bottom surface 45a of the bottom wall 45 is formed as a flat surface that is horizontal in the left-right direction and has no irregularities.

[0020] The outer diameter of the peripheral wall 44 of the lid main body 41 is slightly smaller than the inner diameter of the tube main body 20 of the pouring portion 2. As a result, when the lid 4 is attached to the pouring portion 2 by a mounting step described later, a gap of width L1 is formed between the outer peripheral surface of the peripheral wall 44 of the lid main body 41 and the inner peripheral surface of the tube main body 20 of the pouring portion 2. Width L1 is approximately 0.3 to 0.5 mm. Furthermore, the protrusion length of the protrusion 46 formed on the upper part of the peripheral wall 44 is equal to width L1. Note that the size of width L1 can be changed as appropriate.

[0021] The vertical length of lid main body 41 is set to be slightly shorter than the vertical length of tube main body 20 of spouting portion 2. Specifically, in lid main body 41, the length from the lower surface of flange 42 to bottom surface 45a of bottom wall 45 is shorter than the length from the upper end surface of tube main body 20 to lower surface 32a of lower wall 32 of mounting portion 30. As a result, when lid 4 is attached to spouting portion 2, the upper end surface of tube main body 20 of spouting portion 2 abuts on the lower surface of flange 42 of lid 4, and bottom surface 45a of bottom wall 45 of lid main body 41 is positioned higher than lower surface 32a of lower wall 32 of tube main body 20. The difference in vertical distance between bottom surface 45a and lower surface 32a is approximately 0.1 to 0.7 mm, and preferably 0.5 mm.

[0022] The outer cylinder portion 43 is formed in a shape that surrounds the lid main body portion 41, with a predetermined gap formed between it and the outer peripheral surface of the lid main body portion 41. The outer cylinder portion 43 has a cylindrical shape that is concentric with the lid main body portion 41. A female screw 47 that screws into the male screw 21 of the cylindrical main body portion 20 of the pouring portion 2 is provided on the inner peripheral surface of the outer cylinder portion 43 so as to extend in the circumferential direction.

[0023] 1 and 2, a cap ring 48 that constitutes a known tamper-evident function that certifies the opening and closing history of the lid 4 is connected to the lower end of the outer cylindrical portion 43. The cap ring 48 is attached to a position between the lower edge of the outer cylindrical portion 43 and the annular protrusion 22 of the cylindrical main body 20 so as to correspond to the position of the ratchet 23 provided on the cylindrical main body 20 of the spouting portion 2, and is broken when the lid 4 is opened by rotating it in the opening direction. This indicates that the bag-shaped container is in an opened state.

[0024] The spout 2 and the lid 4 are molded from a conventionally known synthetic resin material, such as thermoplastic resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, and ethylene-propylene copolymer.

[0025] (Configuration of welded part 6) 2, welded portion 6 is formed so as to fill a gap of width L1 between underside 32a of spout 2 and bottom surface 45a of lid main body 41. In other words, underside 32a of spout 2 and bottom surface 45a of lid main body 41 are integrated by welded portion 6, leaving no gap between them. Welded portion 6 is formed by thermally welding the inner periphery of underside 32a of spout 2 and the outer periphery of bottom surface 45a of lid main body 41 through a heating process described later.

[0026] (Configuration of sheet body 5) 2, sheet body 5 serving as a gas barrier layer is attached to the surface where underside 32a of spout 2 and bottom surface 45a of lid main body 41 are joined together by welded section 6. Sheet body 5 has the same shape and size as bottom wall 32 of mounting section 30, and is attached in a manner that covers the entire underside of spout 1.

[0027] The sheet body 5 is a multilayer structure sheet made up of multiple thin-film layers. The sheet body 5 includes a base layer, a gas barrier layer laminated on the lower surface of the base layer, and a heat-sealing layer laminated on the upper surface of the base layer. The material of the sheet body 5 is not particularly limited, but examples of the material that can be used include a multilayer structure sheet laminated with a thermoplastic resin layer such as a polyethylene layer, a polypropylene layer, a polyethylene terephthalate layer, an ethylene vinyl alcohol copolymer layer, or an acrylic layer, an aluminum foil layer, or a ceramic vapor deposition film layer. Note that the thickness of the sheet body 5 is exaggerated in FIG. 2.

[0028] Next, a specific example of a method for manufacturing the spout 1 of this embodiment will be described below with reference to the drawings. The manufacturing method of the spout device 1 of this embodiment includes an attachment step, a heating step, and a gas barrier layer forming step. Figures 3(a) to 3(c), which explain the manufacturing method, show the state of the spout device 1 in the attachment step and the heating step.

[0029] (Installation process) In the attachment step, the lid main body 41 is inserted inside the pouring part 2, thereby attaching the pouring part 2 and the lid part 4.

[0030] As shown in FIG. 3(a), in the attachment process, multiple spouting portions 2 are arranged in a line with their lower surfaces 32a facing downward. The lid portion 4 is placed in a winding machine that can hold the outer tube portion 43 by gripping it, with the bottom surface 45a of the lid main body portion 41 facing downward. The winding machine positions the lid portion 4 so that the line connecting the center of the lower surface 32a of the spouting portion 2 and the center of the bottom surface 45a of the lid main body portion 41 is perpendicular to the lower surface 32a. From this state, the winding machine moves the lid portion 4 it is holding vertically downward and rotates it in the capping direction, resulting in the spouting portion 2 and lid portion 4 being winded together as shown in FIG. 3(b). At this time, the upper end surface of the tube main body portion 20 of the spouting portion 2 abuts against the lower surface of the flange portion 42 of the lid portion 4, and the bottom surface 45a of the lid main body portion 41 is positioned above the lower surface 32a of the tube main body portion 20.

[0031] (Heating process) As shown in FIG. 3(b), after the attachment process, i.e., before the heating process, a gap of width L1 is formed between the inner periphery of the lower surface 32a of the spout 2 and the outer periphery of the bottom surface 45a of the lid main body 41.

[0032] In the heating step, a receiving jig capable of holding the underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41 facing upward is placed, and multiple spout devices 1 are held in the receiving jig. A crimping jig equipped with a thermal welding means is placed above the receiving jig. The crimping jig is then lowered and pressed against the underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41. As a result, as shown in FIG. 3(c), the inner periphery of the underside 32a of the spout 2 and the outer periphery of the bottom surface 45a of the lid main body 41 are thermally welded to form a welded portion 6. The underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41 are integrated by this welded portion 6. When pressing the heat welding means against the lower surface 32a of the spout 2 and the bottom surface 45a of the lid main body 41, a pressing temperature and a predetermined pressing time are selected so that these surfaces are thermally melted appropriately.

[0033] (Gas barrier layer forming process) In the gas barrier layer forming step, a sheet member 5 is attached to the lower surface of the spout 1 to form a gas barrier layer.

[0034] The multilayer structure sheet constituting the sheet body 5 is long and wound up in a roll. The multilayer structure sheet unwound from the roll is bonded to the lower surface 32a of the spouting part 2 and the bottom surface 45a of the lid main body part 41 at the welded part 6 through a bonding process and a cutting process.

[0035] In the bonding process, first, the multilayer sheet is supplied to the production line with the heat-sealing layer facing downward. A receiving jig is placed below the multilayer sheet, capable of holding multiple spouts 1 to which sheet body 5 is not bonded, with the surface where underside 32a of spout 2 and bottom surface 45a of lid body 41 are joined by welded portion 6 facing upward. The receiving jig holds the multiple spouts 1. A crimping jig equipped with a heat-sealing means is placed above the multilayer sheet. The crimping jig is then lowered to apply pressure to the multilayer sheet against the surface where underside 32a of spout 2 and bottom surface 45a of lid body 41 are joined by welded portion 6, thereby bonding the multilayer sheet to the surface where underside 32a of spout 2 and bottom surface 45a of lid body 41 are joined by welded portion 6. The crimping process using the crimping jig is preferably performed multiple times, for example, twice. This allows a high sealing pressure to be applied, improving the bonding strength of the multilayer structure sheet.

[0036] In the cutting step, a laser is applied to the multilayer sheet, which is heat-welded to the surface where the underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41 are joined together by the welded portion 6, along the periphery of the attachment portion 30 of each spout 1, to cut out the outer periphery. After the cutting step, the multilayer sheet is wound up, leaving the spout 1 with the sheet body 5 attached in the receiving jig. This results in a spout 1 in which the sheet body 5 is joined to the surface where the underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41 are joined together by the welded portion 6.

[0037] Next, the effects of this embodiment will be described. (1) The spout device 1 is made of synthetic resin and is attached to the opening of a bag-shaped container that contains a fluid inside. The spout device 1 includes a cylindrical spouting portion 2 that forms a flow path C therein, and a lid portion 4 that is detachably attached to the spouting portion 2 by screwing it into the spouting portion 2. The lid portion 4 has a cylindrical lid main body portion 41 with a bottom that is inserted inside the spouting portion 2. The inner periphery of the lower surface 32a of the spouting portion 2 and the outer periphery of the bottom surface 45a of the lid main body portion 41 are integrated by a welded portion 6 formed by welding them together.

[0038] According to the above configuration, there is no gap between the inner periphery of the lower surface 32a of the spout 2 and the outer periphery of the bottom surface 45a of the lid main body 41. Therefore, even if oxygen flows into the inside of the spout 2, it is blocked by the welded portion 6, which integrates the inner periphery of the lower surface 32a of the spout 2 with the outer periphery of the bottom surface 45a of the lid main body 41. In other words, the flow of oxygen into the container is suppressed. Therefore, a spout 1 with excellent oxygen barrier properties is obtained, and the contents of the bag-shaped container can be well preserved before opening.

[0039] (2) The lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body 41 are covered with the sheet member 5 as a gas barrier layer. According to the above configuration, the flow of oxygen is blocked by the sheet member 5 that is attached to the surface where the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body 41 are joined together by the welded portion 6. This results in a pouring spout 1 with excellent oxygen barrier properties.

[0040] (3) The manufacturing method of the spout device 1 includes an attachment step of inserting a cylindrical lid body 41 with a bottom into the inside of a cylindrical spout 2 that forms a flow path C therein, and a heating step of heating the lower surface 32a of the spout 2 and the bottom surface 45a of the lid body 41. In the heating step, the inner periphery of the lower surface 32a of the spout 2 and the outer periphery of the bottom surface 45a of the lid body 41 are welded together to become one body.

[0041] According to the above configuration, lower surface 32a of pouring portion 2 and bottom surface 45a of lid main body 41 can be integrated by the simple method of heating. Furthermore, a crimping jig similar to the crimping jig equipped with heat welding means used in the gas barrier layer forming step can also be used in the heating step.

[0042] (4) The manufacturing method of the spout 1 includes, after the heating step, a gas barrier layer forming step of forming a gas barrier layer by attaching a sheet body 5 to the underside 32a of the spout 2 and the bottom surface 45a of the lid main body 41.

[0043] According to the above configuration, the flow of oxygen is blocked by sheet member 5, which is attached across the surface where underside 32a of spout 2 and bottom surface 45a of lid main body 41 are joined together by welded portion 6. This results in a spout device 1 with superior oxygen barrier properties.

[0044] (5) In the manufacturing method of the spout device 1, in the attachment step, the lid main body 41 is attached to the spout 2 so that the bottom surface 45a of the lid main body 41 is positioned above the lower surface 32a of the spout 2. According to the above configuration, when the spout 2 and the lid 4 are seamed together in the attachment step, the bottom surface 45a of the lid main body 41 can be prevented from coming into contact with the line and rubbing against it.

[0045] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the spout device 1 of the above embodiment, the vertical length of the lid main body 41 is set to be slightly shorter than the vertical length of the tube main body 20 of the spout 2, but this is not limited to this. For example, the vertical length of the lid main body 41 may be set to match the vertical length of the tube main body 20 of the spout 2. Specifically, in the lid main body 41, the length from the lower surface of the flange 42 to the bottom surface 45a of the bottom wall 45 may be set to be equal to the length from the upper end surface of the tube main body 20 to the lower surface 32a of the lower wall 32 of the attachment portion 30. In this case, when the lid 4 is attached to the spout 2, the upper end surface of the tube main body 20 of the spout 2 abuts against the lower surface of the flange 42 of the lid 4, and the lower surface 32a of the attachment portion 30 of the spout 2 is flush with the bottom surface 45a of the bottom wall 45 of the lid main body 41.

[0046] The spout 1 of the above embodiment has a configuration including a sheet member 5 as a gas barrier layer, but this is not limited to this. For example, the gas barrier layer may be formed by applying a gas barrier agent to a predetermined thickness. Also, the spout 1 need not have a gas barrier layer.

[0047] The manufacturing method of the spout device 1 in the above embodiment is merely an example, and other methods may be used. For example, the gas barrier layer forming step may be omitted. In the attachment process, the lid portion 4 may be placed on the line, and the spout portion 2 may be placed on the winding machine.

[0048] In the heating step, the multilayer structure sheet may be placed between the spout 1 and a crimping jig equipped with a thermal welding means and thermally welded, so that the heating step and the bonding step of the gas barrier layer forming step can be carried out simultaneously.

[0049] In the heating step, the heat-sealing means does not have to be in contact with the entire surfaces of the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body portion 41. For example, an annular heat-sealing means may be used that comes into contact with the inner periphery of the lower surface 32a of the pouring portion 2 and the outer periphery of the bottom surface 45a of the lid main body portion 41.

[0050] The vertical direction in the manufacturing process does not have to be as described above. For example, in the heating process, a crimping jig equipped with a thermal welding means may be pressed from below with lower surface 32a of spout 2 and bottom surface 45a of lid body 41 facing downward.

[0051] The pouring part 2 does not have to have the attachment part 30. In this case, the pouring part 2 is formed of a cylindrical tube main body part 20, and the opening part of the bag-shaped container is heat-sealed to the lower part of the tube main body part 20. Furthermore, the inner periphery of the lower surface of the tube main body part 20 of the pouring part 2 and the outer periphery of the bottom surface 45a of the lid main body part 41 are integrated by the welded part 6.

[0052] The shape of the attachment portion 30 is not limited to that of the above embodiment. A shape that is elongated in the left-right direction increases the adhesive strength by heat sealing, but the shape does not necessarily have to be elongated, and it may be circular when viewed from above.

[0053] The attachment portion 30 is not limited to being formed by a plurality of ribs. For example, it may be formed as a single surface with a diameter larger than the outer diameter of the tube main body 20. The upper wall 31, lower wall 32, and intermediate wall 33 of the mounting portion 30 do not have to have the same shape and size. For example, the upper wall 31 may be the largest, and the intermediate wall 33 may be the largest. Furthermore, the number of intermediate walls 33 is not particularly limited.

[0054] The side surfaces of the upper wall 31, the lower wall 32, and the intermediate wall 33 of the mounting portion 30 are not limited to being flat surfaces, but may be uneven surfaces. The shape of the annular protrusion 22 formed on the outer peripheral surface of the vertically middle part of the cylindrical main body 20 of the pouring part 2 is not particularly limited. For example, it may be circular or hexagonal. Also, the annular protrusion 22 does not have to be formed.

[0055] The ratchet 23 does not have to be formed on the cylindrical main body 20. Also, the tamper-evident function as in the above embodiment does not have to be provided. The lid body 41 of the lid part 4 may be solid. Alternatively, the lid body 41 may be hollow and the upper end thereof may be closed.

[0056] The inner peripheral surface of the peripheral wall 44 of the lid main body 41 is formed in a straight shape with a diameter that does not change in the vertical direction, but is not limited to this. The inner peripheral surface of the peripheral wall 44 may be tapered, for example, so that the inner diameter changes.

[0057] The outer peripheral surface of the peripheral wall 44 of the lid main body 41 is formed in a straight shape with a diameter that does not change in the vertical direction except for the protrusions 46, but is not limited to this. The outer diameter may change by forming a tapered surface on the outer peripheral surface of the peripheral wall 44, for example.

[0058] The protrusion 46 formed on the outer peripheral surface of the peripheral wall 44 of the lid main body 41 has a tapered surface 46a at its lower end, but the shape of the protrusion 46 is not limited to this. For example, the protrusion 46 may have a tapered surface at its upper end that tapers in diameter upward.

[0059] The bottom surface 45a of the bottom wall 45 of the lid main body 41 is formed as a flat surface that is horizontal in the left-right direction and has no irregularities, but is not limited to this. For example, a gate may be provided on the bottom surface 45a, thereby forming irregularities.

[0060] The outer cylinder 43 of the lid main body 41 does not have to be cylindrical. For example, the outer circumferential surface may be elliptical or hexagonal in top view. The shape and size of the sheet body 5 do not have to be the same as the shape and size of the lower wall 32 of the mounting portion 30, and can be changed as appropriate.

[0061] The method for attaching the sheet body 5 does not have to be the adhesive step as in the above embodiment. For example, a multi-layered sheet in the form of a single sheet may be attached to each of the spout devices 1. In the above embodiment, in the cutting step, the multilayer structure sheet is irradiated with a laser along the periphery of the attachment portion 30 of each spout 1, but this is not limited to this. For example, cutting may be performed with a blade.

[0062] The bag-shaped container in the above embodiment is formed from a multi-layered sheet in which an aluminum foil layer is laminated between multiple thin polyethylene sheets, but the configuration and material are not limited to this.

[0063] The spout 1 does not have to be adhered and fixed to the opening of the bag-shaped container by heat sealing. The method of fixing the spout 1 can be changed as appropriate to a method other than heat sealing. Next, the technical ideas that can be understood from the above-described embodiment and modified examples will be described below.

[0064] A method for manufacturing a synthetic resin spout device to be attached to the opening of a container that stores a fluid therein, the method comprising: an attachment step of inserting a bottomed cylindrical lid main body into the inside of a cylindrical spout portion that forms a flow path for the fluid; and a heating step of heating the underside of the spout portion and the bottom surface of the lid main body, wherein the inner periphery of the underside of the spout portion and the outer periphery of the bottom surface of the lid main body are welded together to form an integrated unit, and a gas barrier sheet is attached to the underside of the spout portion and the bottom surface of the lid main body. This configuration reduces the number of steps and makes it possible to easily obtain a spout device with excellent oxygen barrier properties. [Explanation of symbols]

[0065] C...flow path 1…Spout tool 2...Pour part 4…Lid part 5...Sheet body (gas barrier layer) 6...Welded part 20...Cylinder body part 30...Mounting part 32a…Bottom surface 41…Lid body part 45...Bottom wall 45a…Bottom surface

Claims

1. A method for manufacturing a synthetic resin spout that is attached to an opening of a container that contains a fluid therein, comprising: an attachment step of inserting a bottomed cylindrical lid main body into a cylindrical outlet portion that forms a flow path for the fluid; a heating step of heating a lower surface of the spout portion and a bottom surface of the lid main body portion; Equipped with In the heating step, the inner periphery of the lower surface of the pouring portion and the outer periphery of the bottom surface of the lid main body are welded together to form a single unit, and a gas barrier sheet is attached to the lower surface of the pouring portion and the bottom surface of the lid main body.

2. 2. The method for manufacturing a spout according to claim 1, wherein in the heating step, the gas barrier sheet is placed between the spout and a crimping jig equipped with a thermal welding means and thermal welding is performed, thereby welding and integrating the inner periphery of the underside of the spout portion and the outer periphery of the bottom surface of the lid main body portion, and attaching the gas barrier sheet to the underside of the spout portion and the bottom surface of the lid main body portion.

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