Manufacturing method of spouting tool

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 fitting attached to an opening of a container that houses a fluid therein.

Background Art

[0002] A spout fitting attached to an opening of a container such as a packaging bag is known. The spout fitting is configured to suppress the inflow of outside air into the container through a flow path formed therein. For example, Patent Document 1 discloses a spout fitting including a spout that forms a flow path for a fluid and a cap that is detachably attached by screwing onto an inner cylindrical main body portion of the spout. The spout and the cap have the following structure. The spout has a cylindrical inner cylindrical main body portion and a container joining cylinder integrally connected to the lower part thereof. The container joining cylinder includes a cylindrical base portion integrally connected to the inner cylindrical main body portion and an overhanging piece that projects radially from the outer surface of the cylindrical base portion. The cap has a bottomed cylindrical plug body that is inserted into the inner cylindrical main body portion and the cylindrical base portion of the spout to block the flow path inside the spout.

[0003] In the spout fitting described in Patent Document 1, the outer surface of the plug body of the cap is in close contact with the inner surface of the cylindrical base portion of the spout to block the flow path inside the spout. Thereby, it is said that oxygen permeating from the outer surface of the inner cylindrical main body portion can be suppressed from flowing axially inside the inner cylindrical main body portion and flowing into the container.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems 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 the amount of oxygen flowing inside the cylindrical base can be restricted, there is a limit to such restriction. From the perspective of oxygen barrier properties, there was still room for improvement.

[0006] The present invention has been made in view of such a conventional situation, and an object thereof is to provide a method for manufacturing a spout member having excellent oxygen barrier properties.

Means for Solving the Problems

[0007] In order to solve the above problems, as a method for manufacturing a spout member, it is a method for manufacturing a synthetic resin spout member attached to an opening portion of a container that houses a fluid therein, and inside a cylindrical spout portion that forms a flow path for the fluid, a mounting step of inserting a bottomed cylindrical lid main body portion, and a heating step of heating the lower surface of the spout portion and the bottom surface of the lid main body portion, and in the heating step, the inner circumference of the lower surface of the spout portion and the outer circumference of the bottom surface of the lid main body portion are welded and integrated, and a gas barrier sheet is attached to the lower surface of the spout portion and the bottom surface of the lid main body portion, which is characterized.

[0008] In order to solve the above problems, further, in the heating step, the gas barrier sheet is disposed between the spout member and a crimping jig provided with a heat welding means to perform heat welding, so that the inner circumference of the lower surface of the spout portion and the outer circumference of the bottom surface of the lid main body portion are welded 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 member having excellent oxygen barrier properties can be obtained.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0011] The spout tool 1 made of synthetic resin shown in Fig. 1 is attached to the opening of a bag-shaped container made of synthetic resin. Thereby, a flow path for pouring out the fluid accommodated inside the bag-shaped container is formed. The spout tool 1 is adhesively fixed to the opening of the bag-shaped container by heat sealing. The bag-shaped container is formed of a multilayer structure sheet in which an aluminum foil layer is laminated between a plurality of thin film-like sheets made of polyethylene. In the following description, the up and down, left and right shown in Fig. 1 will be described as the up and down, left and right of the spout tool 1.

[0012] As shown in Figs. 1 and 2, the spout tool 1 made of synthetic resin includes a spout portion 2 that forms a fluid flow path C inside, a lid portion 4 that is detachably attached to the spout portion 2 by screwing with the spout portion 2, and a sheet body 5 as a gas barrier layer.

[0013] (Configuration of the spout portion 2) As shown in Fig. 2, the spout portion 2 forms a flow path C inside. The spout portion 2 includes a cylindrical tube main body portion 20 formed over the entire length of the spout portion 2, and a mounting portion 30 integrally formed with the tube main body portion 20 at the lower portion of the tube main body portion 20.

[0014] The inner peripheral surface of the tube main body portion 20 is formed in a straight shape whose diameter does not change in the vertical direction and is formed as a flat surface without unevenness. Thereby, when pouring out the fluid from inside the bag-shaped container, it is possible to suppress the fluid from adhering to or staying on the inner peripheral surface of the tube main body portion 20 that constitutes the flow path C.

[0015] On the outer peripheral surface of the upper portion of the tube main body portion 20, a male screw 21 is formed so as to extend in the circumferential direction. Further, on the outer peripheral surface of the middle portion in the vertical direction of the tube main body portion 20, an annular protrusion 22 protruding in the radial direction is formed over the entire circumferential direction. Furthermore, a plurality of ratchets 23 are formed above 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 cylindrical main body portion 20 at the lower portion of the cylindrical main body portion 20. The attachment portion 30 is formed by a plurality of ribs that are elongated in the left-right direction in a top view. 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 walls 33 have the same shape and the same size, extend parallel to each other, and their respective side surfaces are flush in the vertical direction. Each side surface of the upper wall 31, the lower wall 32, and the intermediate walls 33 is a portion where the opening portion of the bag-shaped container is adhesively fixed by heat sealing, and is formed as a flat surface without irregularities. The lower surface 32a of the lower wall 32 and the bottom surface 45a of the lid main body portion 41 of the lid portion 4 are surfaces to which the sheet body 5 is to be 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 walls 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 walls 33.

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

[0018] As shown in FIG. 2, the lid main body portion 41 is formed as a hollow body including a cylindrical peripheral wall 44 and a bottom wall 45 provided at the lower end edge of the peripheral wall 44. The upper surface of the lid main body portion 41 is open. Since the lid main body portion 41 is inserted inside the cylindrical main body portion 20 of the pouring portion 2, the bottom wall 45 of the lid main body portion 41 closes the flow path C of the cylindrical main body portion 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. Further, at the upper part of the outer peripheral surface of the peripheral wall 44, a protrusion 46 protruding in the radial direction is formed over the entire circumference, and the lower end portion of the protrusion 46 is formed as a tapered surface 46a whose diameter decreases 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 portion where the protrusion 46 is not formed, and its inner peripheral surface is formed as a flat surface without unevenness. 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 unevenness.

[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 cylindrical main body 20 of the pouring part 2. Thereby, in the state where the lid part 4 is attached to the pouring part 2 by the attachment process described later, a gap with a 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 cylindrical main body 20 of the pouring part 2. The width L1 is about 0.3 to 0.5 mm. Further, the protruding length of the protrusion 46 formed at the upper part of the peripheral wall 44 is equal to the width L1. Note that the size of the width L1 can be changed appropriately.

[0021] The vertical length of the lid main body 41 is set to be slightly shorter than the vertical length of the cylindrical main body 20 of the pouring part 2. Specifically, in the lid main body 41, the length from the lower surface of the flange part 42 to the bottom surface 45a of the bottom wall 45 is shorter than the length from the upper end surface of the cylindrical main body 20 to the lower surface 32a of the lower wall 32 of the attachment part 30. Thereby, in the state where the lid part 4 is attached to the pouring part 2, the upper end surface of the cylindrical main body 20 of the pouring part 2 abuts on the lower surface of the flange part 42 of the lid part 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 cylindrical main body 20. The vertical difference between these bottom surface 45a and lower surface 32a is about 0.1 to 0.7 mm, preferably 0.5 mm.

[0022] The outer cylinder part 43 is formed in a shape surrounding the lid main body part 41 with a predetermined interval formed between it and the outer peripheral surface of the lid main body part 41. The outer cylinder part 43 has a cylindrical shape with the same center as the lid main body part 41. On the inner peripheral surface of the outer cylinder part 43, a female screw 47 that engages with the male screw 21 of the cylinder main body part 20 of the pouring part 2 is provided so as to extend in the circumferential direction.

[0023] As shown in FIGS. 1 and 2, a cap ring 48 that constitutes a known tamper-evident function for proving the opening and closing history of the lid part 4 is connected to the lower end of the outer cylinder part 43. The cap ring 48 is attached at a position between the lower end edge of the outer cylinder part 43 and the annular protrusion 22 of the cylinder main body part 20 so as to correspond to the position of the ratchet 23 provided on the cylinder main body part 20 of the pouring part 2, and is broken when the lid part 4 is rotated in the opening direction to open the plug. Thereby, it is shown that the bag-shaped container is in an opened state.

[0024] The pouring part 2 and the lid part 4 are molded from a conventionally known synthetic resin material. Examples of the conventionally known synthetic resin material include thermoplastic resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (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 the welding part 6) As shown in FIG. 2, the welding part 6 is formed so as to fill a gap with a width L1 between the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41. That is, between the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41, there is no gap as they are integrated by the welding part 6. The welding part 6 is formed by thermally welding 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 part 41 by a heating process to be described later.

[0026] (Configuration of the sheet body 5) As shown in FIG. 2, the sheet body 5 as the gas barrier layer is attached to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6. The shape and size of the sheet body 5 are the same as those of the lower wall 32 of the attachment part 30, and it is attached in a manner that covers the entire lower surface of the pouring outlet tool 1.

[0027] The sheet body 5 is composed of a multilayer structure sheet made of a plurality of thin film-like sheets. The sheet body 5 includes a base material layer, a gas barrier layer laminated on the lower surface side of the base material layer, and a heat-sealing layer laminated on the upper surface side of the base material layer. The material of the sheet body 5 is not particularly limited. For example, 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, an acrylic layer, or an aluminum foil layer, a ceramic vapor deposition film layer, etc. can be used. In FIG. 2, the thickness of the sheet body 5 is exaggeratedly shown.

[0028] Next, a specific example of the manufacturing method of the pouring outlet tool 1 of the present embodiment will be described below with reference to the drawings. The manufacturing method of the pouring outlet tool 1 of the present embodiment includes a mounting step, a heating step, and a gas barrier layer forming step. FIGS. 3(a) to (c) for explaining the manufacturing method show the state of the pouring outlet tool 1 in the mounting step and the heating step.

[0029] (Mounting step) In the mounting step, the lid main body part 41 is inserted inside the pouring part 2 to attach the pouring part 2 and the lid part 4.

[0030] As shown in Fig. 3(a), in the mounting process, a plurality of pouring parts 2 are arranged on the line with their lower surfaces 32a facing downward. The lid part 4 is arranged on a winding machine that can be held by gripping the outer cylinder part 43 with the bottom surface 45a of the lid main body part 41 facing downward. By the winding machine, the line connecting the center of the lower surface 32a of the pouring part 2 and the center of the bottom surface 45a of the lid main body part 41 is arranged to be perpendicular to the lower surface 32a. From this state, when the winding machine vertically moves the held lid part 4 downward and rotates it in the closing direction, as shown in Fig. 3(b), the pouring part 2 and the lid part 4 are in a wound state. At this time, the upper end surface of the cylindrical main body part 20 of the pouring part 2 abuts against the lower surface of the flange part 42 of the lid part 4, and the bottom surface 45a of the lid main body part 41 is located above the lower surface 32a of the cylindrical main body part 20.

[0031] (Heating process) As shown in Fig. 3(b), after the mounting process, that is, before the heating process, a gap with a width L1 is formed 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 part 41.

[0032] In the heating process, a receiving jig that can hold the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 facing upward is arranged, and a plurality of pouring outlets 1 are held by the receiving jig. Also, a pressing jig equipped with heat welding means is arranged at a position above the receiving jig. Then, the pressing jig is lowered to apply pressure and press against the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41. As a result, as shown in Fig. 3(c), 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 part 41 are heat welded to form a welded part 6. By this welded part 6, the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 become integral. In the pressing of the heat welding means against the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41, the pressing temperature and a predetermined pressing time are selected so that those surfaces are preferably heat melted.

[0033] (Gas barrier layer forming process) In the gas barrier layer forming process, a gas barrier layer is formed by attaching the sheet body 5 to the lower surface of the pouring outlet 1.

[0034] The multilayer structure sheet constituting the sheet body 5 is in a long shape and is arranged in a wound state in a roll. The multilayer structure sheet unwound from the roll is joined to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6 through an adhesion process and a cutting process.

[0035] In the adhesion process, first, the multilayer structure sheet is supplied to the production line with the heat fusion layer on the lower side. Below the multilayer structure sheet, a receiving jig is arranged that can hold a plurality of pouring outlets 1 to which the sheet body 5 is not joined, in a state where the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6 faces upward, and the receiving jig holds the plurality of pouring outlets 1. Also, above the multilayer structure sheet, a pressure-bonding jig equipped with heat welding means is arranged. Then, the pressure-bonding jig is lowered, and the multilayer structure sheet is pressed against the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6 by applying pressure, thereby joining the multilayer structure sheet to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6. It is preferable to perform the pressure bonding by the pressure-bonding jig a plurality of times, for example, it is preferable to perform it 2 times. By doing so, a high sealing pressure can be applied, and the bonding strength of the multilayer structure sheet can be improved.

[0036] In the cutting process, a laser is irradiated along the periphery of the mounting part 30 of each pouring outlet 1 on the multilayer structure sheet heat-welded to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6, and the outer peripheral part is cut. After the cutting process, by performing a winding process on the multilayer structure sheet, the pouring outlet 1 with the sheet body 5 attached remains in the receiving jig. Thereby, the pouring outlet 1 in which the sheet body 5 is joined to the surface where the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are integrated by the welding part 6 is obtained.

[0037] Next, the effects of this embodiment will be described. (1) The pouring outlet tool 1 is made of synthetic resin and is attached to the opening of a bag-shaped container that stores fluid inside. The pouring outlet tool 1 includes a cylindrical pouring part 2 that forms a flow path C inside, and a lid part 4 that is detachably attached to the pouring part 2 by screwing with the pouring part 2. The lid part 4 has a bottomed cylindrical lid main body part 41 that is inserted inside the pouring part 2. 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 part 41 are integrated by a welded part 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 part 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 part 41 are integrated. That is, the inflow of oxygen into the container is suppressed. Therefore, a pouring outlet tool 1 with excellent oxygen barrier properties can be obtained, and the storage state of the contents in the bag-shaped container before opening can be maintained well.

[0039] (2) The lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 are covered with a sheet body 5 as a gas barrier layer. According to the above configuration, the flow of oxygen is blocked by the sheet body 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 part 41 are integrated by the welded part 6. For this reason, a pouring outlet tool 1 with more excellent oxygen barrier properties can be obtained.

[0040] (3) As a manufacturing method of the pouring outlet tool 1, it includes a mounting process of inserting a bottomed cylindrical lid main body part 41 inside a cylindrical pouring part 2 that forms a flow path C inside, and a heating process of heating the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41. In the heating process, 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 part 41 are welded and integrated.

[0041] According to the above configuration, the lower surface 32a of the pouring part 2 and the bottom surface 45a of the lid main body part 41 can be integrated by a simple method of heating. Also, a pressure-bonding jig similar to the pressure-bonding jig equipped with heat welding means used in the gas barrier layer forming process can be utilized in the heating process.

[0042] (4) As a manufacturing method of the spout tool 1, after the heating step, a gas barrier layer forming step of forming a gas barrier layer by attaching a sheet body 5 to the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid body portion 41 is included.

[0043] According to the above configuration, the flow of oxygen is blocked by the sheet body 5 attached to the surface where the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid body portion 41 are integrated by the welding portion 6. For this reason, a spout tool 1 excellent in oxygen barrier properties can be obtained.

[0044] (5) As a manufacturing method of the spout tool 1, in the mounting step, the lid body portion 41 is mounted on the pouring portion 2 so that the bottom surface 45a of the lid body portion 41 is positioned above the lower surface 32a of the pouring portion 2. According to the above configuration, when the pouring portion 2 and the lid portion 4 are wound and tightened in the mounting step, it is possible to suppress the bottom surface 45a of the lid body portion 41 from coming into contact with and rubbing against the line.

[0045] This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range. · In the spout tool 1 of the above embodiment, the vertical length of the lid body portion 41 is set to be slightly shorter than the vertical length of the cylindrical main body portion 20 of the pouring portion 2, but it is not limited to this. For example, the vertical length of the lid body portion 41 may be set according to the vertical length of the cylindrical main body portion 20 of the pouring portion 2. Specifically, in the lid body portion 41, the length from the lower surface of the flange portion 42 to the bottom surface 45a of the bottom wall 45 may be made equal to the length from the upper end surface of the cylindrical main body portion 20 to the lower surface 32a of the mounting portion 30 of the pouring portion 2. In this case, when the lid portion 4 is attached to the pouring portion 2, the upper end surface of the cylindrical main body portion 20 of the pouring portion 2 abuts against the lower surface of the flange portion 42 of the lid portion 4, and the lower surface 32a of the mounting portion 30 of the pouring portion 2 is flush with the bottom surface 45a of the bottom wall 45 of the lid body portion 41.

[0046] ·In the pouring outlet tool 1 of the above-described embodiment, it is configured to have the sheet body 5 as the gas barrier layer, but it is not limited thereto. For example, as the gas barrier layer, it may be formed by applying a gas barrier agent to a predetermined thickness. Further, it may not have a gas barrier layer.

[0047] ·The manufacturing method of the pouring outlet tool 1 of the above-described embodiment is an example, and other forms may be used. For example, the gas barrier layer forming step may be omitted. ·In the mounting step, the lid portion 4 may be arranged on the line, and the pouring portion 2 may be arranged on the winding machine.

[0048] ·In the heating step, the bonding step of the heating step and the gas barrier layer forming step may be performed simultaneously by arranging the multilayer structure sheet between the pouring outlet tool 1 and the pressure bonding jig provided with the heat welding means and performing heat welding.

[0049] ·In the heating step, it is not necessary to bring the heat welding means into contact with the entire surface 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 welding means that contacts including the inner circumference of the lower surface 32a of the pouring portion 2 and the outer circumference of the bottom surface 45a of the lid main body portion 41 may be used.

[0050] ·The vertical direction in the manufacturing process does not have to depend on the above-described embodiment. For example, in the heating step, with the lower surface 32a of the pouring portion 2 and the bottom surface 45a of the lid main body portion 41 facing downward, the pressure bonding jig provided with the heat welding means may be pressed from below.

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

[0052] · The shape of the attachment part 30 is not limited to that of the above embodiment. Although an elongated shape in the left-right direction increases the adhesion strength by heat sealing, it does not necessarily have to be an elongated shape and may be circular in top view.

[0053] · The attachment part 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 cylindrical main body part 20. · The upper wall 31, lower wall 32, and intermediate wall 33 of the attachment part 30 do not have to be of the same shape and the same size. For example, the upper wall 31 may be the largest, or the intermediate wall 33 may be the largest. Also, the number of intermediate walls 33 is not particularly limited.

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

[0055] · A ratchet 23 may not be formed on the cylindrical main body part 20. Also, a tamper-evident function as in the above embodiment may not be provided. · The lid main body part 41 of the lid part 4 may be solid. Also, in the hollow lid main body part 41, its upper end part may be closed.

[0056] · The inner peripheral surface of the peripheral wall 44 of the lid main body part 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, for example, if a tapered surface is formed on the inner peripheral surface of the peripheral wall 44.

[0057] · The outer peripheral surface of the peripheral wall 44 of the lid main body part 41 is formed in a straight shape with a diameter that does not change in the vertical direction in parts other than the protrusion 46, but is not limited to this. The outer diameter may change, for example, if a tapered surface is formed on the outer peripheral surface of the peripheral wall 44.

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

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

[0060] · The outer cylinder portion 43 of the lid body portion 41 does not have to be cylindrical. For example, the outer peripheral surface may be elliptical in top view, hexagonal in top view, or the like. · 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 of attaching the sheet body 5 does not have to rely on an adhesion process as in the above - described embodiment. For example, a multi - layer sheet in a single - sheet state may be adhered to each of the pouring outlet tools 1. · In the above - described embodiment, in the cutting - out process, a laser is irradiated along the periphery of the attachment portion 30 of each pouring outlet tool 1 to cut the multi - layer structure sheet, but it is not limited to this. For example, it may be cut with a blade.

[0062] · The bag - shaped container of the above - described embodiment is formed of a multi - layer structure sheet in which an aluminum foil layer is laminated between a plurality of thin - film - like sheets made of polyethylene, but its configuration and material are not limited to this.

[0063] · The pouring outlet tool 1 does not have to be adhesively fixed to the opening portion of the bag - shaped container by heat - sealing. The method of fixing the pouring outlet tool 1 can be appropriately changed to other methods other than heat - sealing. Next, the technical idea that can be grasped from the above - described embodiment and modification examples is described below.

[0064] A manufacturing method of a synthetic resin spout member attached to an opening portion of a container for storing a fluid, the method comprising: a mounting step of inserting a bottomed cylindrical lid body portion inside a cylindrical spout portion that forms a flow path of the fluid; and a heating step of heating a lower surface of the spout portion and a bottom surface of the lid body portion. In the heating step, an inner periphery of the lower surface of the spout portion and an outer periphery of the bottom surface of the lid body portion are welded and integrated, and a gas barrier sheet is attached to the lower surface of the spout portion and the bottom surface of the lid body portion. According to this configuration, the number of steps can be reduced, and a spout member excellent in oxygen barrier properties can be easily obtained.

Explanation of Signs

[0065] C…Flow path 1…Spout member 2…Spout portion 4…Lid portion 5…Sheet body (gas barrier layer) 6…Welded portion 20…Cylindrical main body portion 30…Mounting portion 32a…Lower surface 41…Lid body portion 45…Bottom wall 45a…Bottom surface

Claims

1. 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, characterized in that in the heating process, 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 become one body, and a gas barrier sheet is attached to the underside of the spout portion and the bottom surface of the lid main body.

2. The method for manufacturing a spout device as described in claim 1, characterized in that in the heating process, the gas barrier sheet is placed between the spout device and a crimping tool 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 and integrated together, 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.

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