Spout and method for producing the same

Abstract

To provide a spouting tool excellent in oxygen barrier property.SOLUTION: A synthetic resin spouting tool 1 fitted to the open part of a container storing fluid therein, has a cylindrical spouting part 2 forming a passage C of the fluid, and a lid part 4 detachably fitted to the spouting part 2 by screwing to the spouting part 2. The lid part 4 has a bottomed cylindrical lid body part 41 inserted into the spouting part 2. The inner periphery of a lower face 32a of the spouting part 2 and the outer periphery of a bottom face 45a of the lid body part 41 are integrated by a welding part 6 formed by mutual welding thereof.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] A spout device that is attached to an opening of a container such as a packaging bag is known. The spout device is configured to suppress the inflow of outside air into the container through a flow path formed inside the spout device. 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 an inner cylindrical body of the spout. The spout and the 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 spout. 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 inner cylindrical body and the cylindrical base of the spout 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 is in close contact with the inner surface of the cylindrical base of the spout, blocking the flow path inside the spout. This is said to be able to prevent oxygen that has permeated from the outer surface of the inner cylindrical main body from flowing axially inside the inner cylindrical main body into the container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-90271 A 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 much such a limit can be achieved. From the viewpoint of oxygen barrier properties, there is still room for improvement.

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

[0007] In order to solve the above problems, the spout device is made of synthetic resin and is attached to the opening of a container that holds a fluid therein, and comprises a cylindrical spout portion that forms a flow path for the fluid, and a lid portion that is removably attached to the spout portion by screwing into the spout portion, and the lid portion has a bottomed cylindrical lid main body portion that is inserted inside the spout portion, and 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 integrated together by a welded portion formed by welding them to each other.

[0008] In order to solve the above problems, a manufacturing method for a synthetic resin spout device is provided which is attached to an opening of a container which contains a fluid therein, and which includes an attachment step of inserting a bottomed cylindrical lid main body part into the inside of a cylindrical spout part which 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 part, wherein the inner periphery of the underside of the spout part and the outer periphery of the bottom surface of the lid main body part are welded together to become one body in the heating step. Effect of the Invention

[0009] According to the present invention, a spout device having excellent oxygen barrier properties is obtained. [Brief description of the drawings]

[0010] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] 4A to 4C are explanatory diagrams sequentially showing the manufacturing process of the spout device of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The synthetic resin spout 1 shown in FIG. 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 bonded and fixed to the opening of the bag-shaped container by heat sealing. The bag-shaped container is formed from a multi-layered 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 FIG. 1 are described as the top, bottom, left, and right of the spout 1.

[0012] As shown in Figures 1 and 2, a 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 to the spout portion 2, and a sheet body 5 that serves as a gas barrier layer.

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

[0014] The inner peripheral surface of the tube main body 20 is formed in a straight shape with a diameter that does not change in the vertical direction, and is formed as a flat surface without any irregularities. This prevents the fluid from adhering to or remaining on the inner peripheral surface of the tube main body 20 that constitutes 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 in the circumferential direction 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 circumferential direction on the outer peripheral surface of the vertical 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 in a shape that protrudes radially outward from the outer peripheral surface of the tube main body portion 20 at the lower portion of the tube main body portion 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 respective side surfaces of the upper wall 31, the lower wall 32, and the intermediate wall 33 are portions to which the opening portion of the bag-shaped container is bonded and fixed by heat sealing, and are formed as flat surfaces without 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 body 5 is attached in a 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 portion 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 into the inside of 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, the lid 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 the peripheral wall 44. The upper surface of the lid body 41 is open. The lid body 41 is inserted into the inside of the tube body 20 of the spout 2, so that the bottom wall 45 of the lid body 41 closes the flow path C of the tube 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 downward. 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 the inner peripheral surface is formed as a flat surface without any 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 formed slightly smaller than the inner diameter of the tube main body 20 of the pouring part 2. As a result, when the lid 4 is attached to the pouring part 2 by a mounting process 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 part 2. The width L1 is about 0.3 to 0.5 mm. The protruding length of the protrusion 46 formed on the upper part of the peripheral wall 44 is equal to the width L1. The size of the width L1 can be appropriately changed.

[0021] 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 pouring part 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 is shorter than 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 mounting part 30. As a result, when the lid 4 is attached to the pouring part 2, the upper end surface of the tube main body 20 of the pouring part 2 abuts on the lower surface of the flange 42 of the lid 4, and the bottom surface 45a of the bottom wall 45 of the lid main body 41 is located above the lower surface 32a of the lower wall 32 of the tube main body 20. The difference in the vertical direction between the bottom surface 45a and the bottom surface 32a is about 0.1 to 0.7 mm, and preferably 0.5 mm.

[0022] The outer cylinder portion 43 is formed in a shape surrounding 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 is cylindrical and has the same center as the lid main body portion 41. A female screw 47 that screws into the male screw 21 of the tube 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 constituting 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 cylinder 43. The cap ring 48 is attached to a position between the lower edge of the outer cylinder 43 and the annular protrusion 22 of the cylinder body 20 so as to correspond to the position of the ratchet 23 provided on the cylinder body 20 of the spouting part 2, and is broken when the lid 4 is rotated in the opening direction to open it. This indicates that the bag-shaped container is in an opened state.

[0024] The spout 2 and the lid 4 are made of a conventionally known synthetic resin material, such as thermoplastic resins including 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, the welded portion 6 is formed so as to fill a gap of width L1 between the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body 41. In other words, the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body 41 are integrated by the welded portion 6, and there is no gap between them. The welded portion 6 is formed by thermally welding 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 41 by a heating process described later.

[0026] (Configuration of sheet body 5) 2, sheet body 5 as a gas barrier layer is attached to the surface where lower surface 32a of spout part 2 and bottom surface 45a of lid main body 41 are integrated by welding part 6. Sheet body 5 has the same shape and size as lower wall 32 of attachment part 30, and is attached in a manner that covers the entire lower surface of spout device 1.

[0027] The sheet body 5 is composed of a multi-layered sheet consisting of a thin-film-like sheet. The sheet body 5 includes a base layer, a gas barrier layer laminated on the lower surface side of the base layer, and a heat-sealing layer laminated on the upper surface side of the base layer. The material of the sheet body 5 is not particularly limited, but for example, a multi-layered sheet in which a thermoplastic resin layer such as a polyethylene layer, a polypropylene layer, a polyethylene terephthalate layer, an ethylene vinyl alcohol copolymer layer, an acrylic layer, or the like, an aluminum foil layer, a ceramic vapor deposition film layer, or the like is laminated can be used. 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 (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 mounting process, the spouting portion 2 is arranged on a line with the lower surface 32a facing downward. The lid portion 4 is arranged 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 arranges 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 to be perpendicular to the lower surface 32a. From this state, when the winding machine moves the held lid portion 4 vertically downward and rotates it in the plugging direction, the spouting portion 2 and the lid portion 4 are wound and fastened 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 located above the lower surface 32a of the tube main body portion 20.

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

[0032] In the heating step, a receiving jig capable of holding the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body 41 facing upward is placed, and the receiving jig holds a plurality of pouring spout devices 1. A crimping jig equipped with a thermal welding means is placed above the receiving jig. The crimping jig is then lowered to apply pressure to the lower surface 32a of the pouring part 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 lower surface 32a of the pouring part 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 lower surface 32a of the pouring part 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 body 41, a pressing temperature and a predetermined pressing time are selected so that these surfaces are suitably thermally melted.

[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 multilayered sheet constituting the sheet body 5 is long and wound in a roll. The multilayered sheet unwound from the roll is joined to the surface where the lower surface 32a of the spouting part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding 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 capable of holding a plurality of spout devices 1 to which the sheet body 5 is not joined is placed below the multilayer sheet in a state in which the surface where the lower surface 32a of the spout portion 2 and the bottom surface 45a of the lid main body 41 are integrated by the welding portion 6 faces upward, and the receiving jig holds the plurality of spout devices 1. A pressure-bonding jig equipped with a heat-bonding means is placed above the multilayer sheet. Then, the pressure-bonding jig is lowered to press the multilayer sheet against the surface where the lower surface 32a of the spout portion 2 and the bottom surface 45a of the lid main body 41 are integrated by the welding portion 6, thereby bonding the multilayer sheet to the surface where the lower surface 32a of the spout portion 2 and the bottom surface 45a of the lid main body 41 are integrated by the welding portion 6. It is preferable to perform pressure bonding using the pressure-bonding jig multiple times, for example, it is preferable to perform it twice. This allows a high sealing pressure to be applied, improving the bonding strength of the multi-layered sheet.

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

[0038] According to the above configuration, there is no gap between the inner circumference of the lower surface 32a of the pouring part 2 and the outer circumference of the bottom surface 45a of the lid main body 41. Therefore, even if oxygen flows into the inside of the pouring part 2, it is blocked by the welded part 6 where the inner circumference of the lower surface 32a of the pouring part 2 and the outer circumference of the bottom surface 45a of the lid main body 41 are integrated. In other words, the flow of oxygen into the container is suppressed. Therefore, the pouring spout 1 has excellent oxygen barrier properties, and the storage state of the contents in the bag-shaped container before opening can be well maintained.

[0039] (2) The lower surface 32a of the pouring part 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 attached to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body 41 are integrated by the welding part 6. Therefore, a pouring spout 1 with excellent oxygen barrier properties is obtained.

[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-mentioned configuration, lower surface 32a of pouring portion 2 and bottom surface 45a of lid main body 41 can be integrated by a simple method of heating. Also, a crimping jig equipped with a thermal welding means used in the gas barrier layer forming step can be used in the heating step as well.

[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 portion 41.

[0043] According to the above configuration, the flow of oxygen is blocked by the sheet member 5 attached to the surface where the lower surface 32a of the spout 2 and the bottom surface 45a of the lid body 41 are integrated by the welded portion 6. Therefore, the spout 1 has excellent oxygen barrier properties.

[0044] (5) In the manufacturing method of the spout device 1, in the attachment step, the lid body 41 is attached to the spouting portion 2 so that the bottom surface 45a of the lid body 41 is positioned above the lower surface 32a of the spouting portion 2. According to the above configuration, when the spouting portion 2 and the lid portion 4 are tightened in the attachment step, it is possible to prevent the bottom surface 45a of the lid body 41 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 with each other to the extent that there is no technical contradiction. In the above embodiment of the spout 1, the vertical length of the lid body 41 is set to be slightly shorter than the vertical length of the tube body 20 of the spout 2, but is not limited thereto. For example, the vertical length of the lid body 41 may be set to match the vertical length of the tube body 20 of the spout 2. Specifically, in the lid 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 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 body 20 of the spout 2 abuts on 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 body 41.

[0046] The spout 1 of the above embodiment has a configuration including a sheet body 5 as a gas barrier layer, but 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 may not have a gas barrier layer.

[0047] The manufacturing method of the spout device 1 in the above embodiment is just 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 pouring portion 2 may be placed on the seaming machine.

[0048] In the heating step, the multilayer sheet may be placed between the spout 1 and a pressure bonding tool equipped with heat welding means, and heat welding may be performed, so that the heating step and the adhesion step of the gas barrier layer formation step may be performed simultaneously.

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

[0050] The vertical direction in the manufacturing process does not have to be the same as that in the above embodiment. For example, in the heating process, a crimping tool equipped with a thermal welding means may be pressed against the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid body part 41 from below in a state in which they face 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-like container is heat-sealed to the lower part of the tube main body part 20. In addition, 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 welding part 6.

[0052] The shape of the attachment portion 30 is not limited to that in 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 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 having a diameter larger than the outer diameter of the tube main body 20. The upper wall 31, the lower wall 32, and the 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. In addition, 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, and may be surfaces having projections and recesses. The shape of the annular protrusion 22 formed on the outer circumferential surface of the vertical middle part of the tube 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 tube main body 20. In addition, 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. Also, the upper end of the hollow lid body 41 may be closed.

[0056] The inner circumferential 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 diameter may change by forming a tapered surface on the inner circumferential surface of the peripheral wall 44, for example.

[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 protrusion 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 circumferential surface of the peripheral wall 44 of the lid 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, the diameter of which decreases as it goes 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, which may result in irregularities.

[0060] The outer cylinder portion 43 of the lid main body 41 does not have to be cylindrical. For example, the outer circumferential surface may be elliptical or hexagonal when viewed from above. 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 attachment portion 30 and can be changed as appropriate.

[0061] The method for attaching the sheet body 5 does not have to be the bonding process as in the above embodiment. For example, a multi-layered sheet in a sheet state may be bonded 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 with a blade may be used.

[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 bonded 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, technical ideas that can be understood from the above embodiment and modified examples will be described below.

[0064] A method for manufacturing a synthetic resin spout to be attached to an opening of a container that contains a fluid therein, the method comprising the steps of: inserting a bottomed cylindrical lid body into the inside of a cylindrical spout that forms a flow path for the fluid; and heating the underside of the spout and the bottom side of the lid body, wherein the inner periphery of the underside of the spout and the outer periphery of the bottom side of the lid body are welded together and integrated, and a gas barrier sheet is attached to the underside of the spout and the bottom side of the lid body. With this configuration, the number of steps can be reduced, and a spout with excellent oxygen barrier properties can be easily obtained. [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 synthetic resin spout device that is attached to an opening of a container that contains a fluid therein, a cylindrical outlet portion that forms a flow path for the fluid; and a lid portion that is detachably attached to the outlet portion by being screwed to the outlet portion, The lid portion has a cylindrical lid main body portion with a bottom that is inserted into the inside of the spout portion, A spout device characterized in that the inner periphery of the lower surface of the spout portion and the outer periphery of the bottom surface of the lid body portion are integrated together by a welded portion formed by welding them to each other.

2. The spout device according to claim 1, wherein a lower surface of the spout portion and a bottom surface of the lid body are covered with a gas barrier layer.

3. A method for manufacturing a synthetic resin spout device to be attached to an opening of a container that contains a fluid therein, comprising the steps of: a mounting step of inserting a bottomed cylindrical lid main body into the inside of a cylindrical outlet portion that forms a flow path for the fluid; a heating step of heating a lower surface of the pouring portion and a bottom surface of the lid main body; Equipped with A method for manufacturing a spout device, wherein in the heating step, 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 to become one body.

4. The method for manufacturing a spout according to claim 3, further comprising, after the heating step, a gas barrier layer forming step of forming a gas barrier layer on the lower surface of the spout portion and on the bottom surface of the lid body portion.

5. 5. The method for manufacturing a spout device according to claim 3, wherein in the mounting step, the lid body is mounted to the spout portion such that a bottom surface of the lid body is positioned above a lower surface of the spout portion.

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