JP7619755B2 - Winding member, container, winding method, and method for manufacturing container - Google Patents

Description

The present invention relates to a winding member, a container formed using the winding member, a winding method, and a method for manufacturing a container.

Conventionally, cartridges for storing caulking materials, adhesives, etc. have been made by wrapping a film around the entire outer periphery of a cylindrical member. For example, FIG. 1 of Patent Document 1 discloses a cartridge 1 formed so that the contents can be pushed out by a plunger 4, in which an aluminum laminate film 7 is adhered to the entire outer periphery of a cylindrical body 2 made of a resin such as polyethylene.

The resin body 2 is cylindrical with an almost uniform outer diameter, and one open end is sealed by a lid consisting of a head 5 made of polyethylene and a membrane piece 6. That is, the disk-shaped head 5 is fused to the inner surface of the open end of the cylindrical body 2, which is an extrusion molded product, to form a bottomed cylindrical container.

The aluminum laminate film 7 is a film with gas barrier properties, and by wrapping and fusing this around the outer periphery of the cylindrical body 2, it is possible to prevent water vapor and the like from penetrating the container and entering the inside, thereby maintaining the quality of the contents in good condition. In addition, by providing a film member with letters, designs, etc. printed on it around the outer periphery of the cylindrical body 2, the film member also serves as a label.

That is, the cylindrical body 2 functions as a winding member around which the aluminum laminate film 7 is wound, and the state of winding and adhesion between the two affects the ability to hold the contents. The beginning and end of the film 7 are overlapped and glued together, so there is no gap between the two ends.

In the process of wrapping the film material around the entire outer periphery of the cylindrical main body 2, a device is used that wraps the film material while pressing it against the outer periphery of the cylindrical main body 2, such as the manufacturing device disclosed in Patent Document 1. According to the manufacturing device disclosed in Patent Document 1, a drum with an elastic sheet on its surface is in contact with the cylindrical main body 2 fitted into the spindle, and the cylindrical main body 2 rotates as the drum rotates. This makes it possible to wrap the film material, which is being rotated and transported by the drum, around the cylindrical main body 2.

Patent No. 4665951

The resin cylindrical body 2, which is an extrusion molded product, is fused to a separate resin head 5 to form a container, which tends to increase the defect rate during the fusion process, and when the film material is wrapped around it, tiny wrinkles can form in the film material on the open end side.

The applicant attempted to omit the welding process by finishing the head 5 and cylindrical body 2 as a one-piece molded product from resin, with the main objective of reducing the defective rate in the fusion process. In other words, the applicant attempted to integrally mold a bottomed cylindrical member that would become a container by injection molding of resin.

However, when the aluminum laminate film is wrapped around and fused to the cylindrical portion of this injection-molded, bottomed cylindrical member, a problem occurs in that larger wrinkles than ever before are formed at both ends of the aluminum laminate film (both axial ends of the cylindrical portion). If such wrinkles occur, there is a risk that the gas barrier properties will be impaired or the appearance of the label will be impaired.

Therefore, the applicant made numerous attempts and devised ways to solve this problem, and discovered that by making the outer diameter of each of the axial ends of the area in the tubular portion of the bottomed tubular member, which is an injection molded product, where the film material is wrapped, larger than the outer diameter of the axial center of that area, the aluminum laminate film can be wrapped and fused without wrinkles.

In other words, it was found that in terms of molding precision, it is somewhat difficult to make the center and open end of the tubular part the same diameter due to molding shrinkage, residual stress, etc., and even if molding is done aiming for the same diameter, the diameter tends to be uneven between the open end and the center, and in particular the diameter on the open end side can shrink and become shorter, and depending on the degree of shortening, wrinkles can occur. It is possible to solve the above problems by improving the precision of the molding dimensions, but this is not an easy solution as it involves substantial precision issues.

The applicant therefore discovered that by making the open end side larger in diameter than the center, contrary to the conventional idea of making the diameter of the center and ends of the tubular portion the same, wrinkles would not form when the film member was rolled up. This makes it easy to ensure that the diameter of the end does not become smaller than the diameter of the center, even if molding shrinkage occurs during resin molding, in terms of molding precision.

The reason why this phenomenon occurs is unclear, but when the film material is wrapped around the cylindrical part, the end of the film material is crimped and fixed to the large diameter part before the center part, and then the film material is crimped to the small diameter center part. This causes the film material to stretch slightly in the axial direction and tends to shrink circumferentially towards the center, so it is thought that wrinkles do not form in the small diameter center part in the circumferential direction. (More details will be given in the explanation of the embodiment of the present invention.)

It is also clear that this method of wrapping a film material can be applied not only to cylindrical members, but also to wrapping members such as rod-shaped members, where the film material is wrapped around the outer periphery, and is also effective when wrapping and adhering a protective film around a cylindrical member, for example.

The present invention was made based on the above findings, and aims to provide a winding member, a container using the winding member, a winding method, and a method for manufacturing a container, in which a film member is wound around the outer periphery thereof and which makes it possible to prevent the film member from wrinkling.

The winding member according to the present invention is a rod-shaped or tubular winding member around whose outer circumferential surface a film material is wound, and the outer diameter of each of the axial ends of the region around which the film material is wound is larger than the outer diameter at the axial center of the region.

This configuration makes it possible to prevent wrinkles from forming in the film material wrapped around the outer peripheral surface. More specifically, the above configuration may be such that the outer diameter of each of the two axial ends is 0.2% to 3% larger than the outer diameter at the axial center.

The container according to the present invention is configured to use the above-described cylindrical winding member around which the gas barrier film member is wound, and is configured so that the contents can be stored inside the winding member. This configuration makes it possible to enjoy the advantages of the winding member configured as above. In addition, in the container, the winding member may be a resin molded product in the shape of a cylinder with a bottom.

The winding method according to the present invention is a winding method for winding the film member around the outer peripheral surface of the winding member having the above-mentioned configuration, in which the outer peripheral surface of the film member is pressed in the axial direction such that both axial ends are pressed before the axial center. In this winding method, the winding member and the film member may have opposing surfaces formed of resin, and the film member may be wound around the outer peripheral surface and the surfaces may be bonded together.

The method for manufacturing a container according to the present invention is a method for manufacturing a container having the above-mentioned configuration, and includes a winding step of winding the film member around the outer peripheral surface of the winding member, and in the winding step, the film member is pressed against the outer peripheral surface in the axial direction such that both axial ends are pressed against the axial center.

In the above manufacturing method, the opposing surfaces of the winding member and the film member may be formed of resin, and the winding step may be a step of winding the film member around the outer peripheral surface and bonding the surfaces together.

The wrapping member according to the present invention is a member around whose outer periphery a film member is wrapped, making it possible to prevent the film member from wrinkling.

2 is a diagram illustrating the configuration of a cartridge CT according to the embodiment. FIG. 1 is a configuration diagram of a winding device according to an embodiment of the present invention. 3A and 3B are explanatory diagrams relating to a cylindrical winding member according to the embodiment. FIG. 1 is an explanatory diagram regarding the main cause of the phenomenon that wrinkles are easily generated. FIG. 1 is an explanatory diagram regarding the main cause of eliminating the occurrence of wrinkles.

The embodiment of the present invention will be described with reference to the drawings. Note that the front-rear direction in the following description is merely defined for convenience so as to coincide with the axial direction of the cylindrical winding member.

1. Cartridge Configuration Fig. 1 is a schematic diagram of the cartridge CT according to this embodiment. Fig. 1 (as well as Fig. 3 described later) is a cross-sectional view taken along a plane passing through the central axis of a cylindrical winding member. As shown in these figures, the cartridge CT is formed using a cylindrical winding member 1, a membrane 2, a plunger 3, and a film member 7a, and is used as a container for containing a fluid such as a caulking material or adhesive (hereinafter referred to as a "content").

The cylindrical winding member 1 in this embodiment is configured as a bottomed cylindrical member (resin molded product) that is integrally formed as a whole by resin injection molding, and a canopy portion 1b with an opening OP is provided on the front side of the cylindrical body portion 1a. For example, polyethylene or the like can be used as the resin that forms the cylindrical winding member 1. In this embodiment, the cylindrical winding member 1 is adapted to hold about 320 cc of contents, and is set to have a total length (axial length) of about 220 mm, an outer diameter (outer diameter of the body portion 1a) of about 50 mm, and a wall thickness of about 1 mm.

The canopy 1b is configured with a discharge port that protrudes forward at the front center of the disk-shaped portion with the axial direction being the front-to-rear direction. An opening OP that extends in the front-to-rear direction is formed at the center of this discharge port, and connects the inside of the cylindrical winding member 1 to the outside when the membrane 2 is broken. The radial dimension of the inner wall of the opening OP is sufficiently smaller than the inner diameter of the body 1a.

The membrane 2 is a thin film-like member that is provided inside the cylindrical member 1 to cover the opening OP, and is formed by laminating, for example, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, an aluminum foil, and a polyethylene (PE) film.

The plunger 3 is a member formed in a cylindrical shape with a bottom, and is formed, for example, by providing an aluminum barrier layer on a polyethylene body, with an outer diameter set to be equal to or slightly larger than the inner diameter of the body portion 1a. The plunger 3 is fitted into the rear open end of the body portion 1a with the bottom side facing forward. Grease is provided between the plunger 3 and the body portion 1a to reduce sliding resistance and allow the plunger 3 to move smoothly. This grease also serves to prevent the ingress and egress of gases, moisture, etc. in the gap between the plunger 3 and the body portion 1a, and functions as a lubricant with high barrier properties.

The film member 7a is formed as a laminated film with a sandwich structure in which a barrier layer (e.g., aluminum foil) is sandwiched between layers of resin, and is wrapped around the outer peripheral surface of the cylindrical winding member 1 (corresponding to the outer peripheral surface of the body portion 1a in this embodiment) so as to entirely cover the outer peripheral surface. Although the film member 7a is a thin film as described above, it is laminated with aluminum foil and has very high gas barrier properties. This prevents water vapor and the like from penetrating the cylindrical member 1 and entering the inside, and the quality of the contents can be maintained.

As an example, the film member 7a in this embodiment is configured by laminating a 16 μm PET layer, a 9 μm aluminum foil, a 20 μm polyethylene layer, and a 40 μm heat-sensitive adhesive layer (one form of resin layer) in this order. In addition, the film member 7a may have characters, designs, etc. printed on its surface so that it functions as a label for the cartridge CT.

When the cartridge CT is unopened, the opening OP is sealed by the membrane 2, which allows the quality of the contents to be maintained at a good level. When in use, the opening OP can be opened by breaking the membrane 2, allowing the contents to be released. When in use, the cartridge CT can be set in a dedicated tool (e.g., a handgun), allowing the user to move the plunger 3 forward with a simple operation, and easily push out an appropriate amount of the contents.

2. Manufacturing Method of Cartridge The cartridge CT having the above-mentioned configuration is manufactured through a process of winding the film member 7a around the outer peripheral surface of the cylindrical winding member 1, a process of providing the membrane 2 inside the cylindrical winding member 1, a process of housing an object to be contained inside the cylindrical winding member 1, and a process of providing the plunger 3 on the rear side of the cylindrical winding member.

Of the above steps, the step of winding the film member 7a around the outer peripheral surface of the cylindrical winding member 1 (winding step) is carried out using a winding device 10 as shown in FIG. 2. The configuration of the winding device 10 and the winding step are described below. Note that the configuration of the winding device 10 and the winding step are basically the same as the manufacturing device 10 and manufacturing method disclosed in Patent Document 1 (Patent Publication No. 4665951), so only a brief description will be given here.

The winding device 10 includes a drum 14, an elastic sheet 15 arranged on the outer peripheral surface of the drum 14, a motor 16 that drives the drum 14, a suction pump 17 that sucks air from inside the drum 14, a sensor 18, a hot air generator 19, a spindle 20, and an air cylinder 21 that moves the spindle 20 up and down.

An uncut film material 7 is prepared in advance near the drum 14 of the winding device 10. When the winding process is carried out, this film material 7 is sent out toward the drum 14 by a predetermined length (a length corresponding to the outer circumferential dimension of the tubular member 1), placed on the surface of the elastic sheet 15, and cut. The cut film material 7a is transported by the rotation of the drum 14 toward the tubular winding member 1 fitted into the spindle 20.

In addition, the drum 14 and the elastic sheet 15 are provided with air vent holes, for example with a diameter of about 1 mm, throughout the entire area where the film 7 is fixed, and a suction pump 17 is connected to the inside of the drum 14. When the suction pump 17 sucks in air, the air is sucked in through the air vent holes provided in the drum 14 and the elastic sheet 15. This makes it possible to fix the film member 7a by suction onto the elastic sheet 15.

After the film member 7a starts to be conveyed, when the sensor 18 detects the film member 7a, the cylinder 21 raises the spindle 20 to press the tubular winding member 1 against the elastic sheet 15. The spindle 20 is rotatable with the tubular winding member 1 fitted in it, so the spindle 20 rotates as the drum 14 rotates, and the tubular winding member 1 rotates in perfect synchronization with the drum 14. As the drum 14 continues to rotate with the film member 7a adsorbed and fixed, the film member 7a is wrapped around the outer circumferential surface of the tubular winding member 1 from the leading end side in the conveying direction.

To explain in more detail, the film member 7a on the elastic sheet 15 first comes into contact with the cylindrical winding member 1 at the leading end in the transport direction, and is then pressed against the cylindrical winding member 1 by the elastic force of the elastic sheet 15 (see Figures 4 and 5 described below). As the drum 14 rotates, a similar phenomenon occurs sequentially toward the trailing end in the transport direction, allowing the film member 7a to be wound while being pressed against the cylindrical winding member 1.

The hot air generator 19 is located far from the drum 14 until a predetermined time has elapsed since the sensor 18 detected the film member 7a, and then moves to a position close to the drum 14 when the film member 7a reaches a position where it is hit by the hot air after the predetermined time has elapsed. The hot air from the hot air generator 19 melts the resin layer (heat-sensitive adhesive layer) of the film member 7a, making it ready for bonding by fusion.

At the same time, hot air blown from the hot air generator 19 convects in the area close to the drum 14 and the spindle 20, and the surface of the cylindrical winding member 1 is heated by the convecting hot air. As a result, when the film member 7a with the melted layer of heat-sensitive adhesive is wrapped around the surface of the cylindrical winding member 1 whose surface temperature has increased, the resin of the film member 7a and the cylindrical winding member 1 are bonded to each other. Finally, the film member 7a is bonded to the entire outer periphery of the cylindrical winding member 1.

In this embodiment, the opposing surfaces of the cylindrical winding member 1 and the film member 7a are formed of resin, and the winding process is a process of wrapping the film member 7a around the outer peripheral surface of the cylindrical winding member 1 and bonding the surfaces together. Specific forms of the process of bonding the surfaces together include melting and fusing a resin layer (for example, a sealant layer or a heat-sensitive adhesive layer made of a thermoplastic resin), or using an adhesive such as a seal. In this way, the "bonding" of the surfaces together is a concept that includes a form in which an adhesive or the like is interposed between the two, as well as a form in which the two are fused together.

3. Regarding the outer diameter of the cylindrical winding member The applicant carried out the above-mentioned winding process using the cylindrical winding member 1 and the film member 7a formed by injection molding, and found that the film member was prone to wrinkles. The applicant further investigated the cause of this and found that the outer diameter of the cylindrical winding member 1 affects the occurrence of wrinkles in the film member 7a.

To explain in more detail, when the cylindrical winding member 1 was formed by injection molding, the target value of the outer diameter was set uniformly regardless of the axial position, but the outer diameter of the actually formed cylindrical winding member 1 was larger at the axial center than at both axial ends. Possible causes of this include residual stress occurring in the cylindrical member 1 and differences in molding shrinkage due to differences in wall thickness at axial positions. More specifically, it is thought that the axial rear end (cylindrical opening end) of the cylindrical winding member 1 was affected by residual stress that narrows inward, while the axial front end was affected by the high molding shrinkage due to the wall thickness provided by the canopy portion 1b.

It was also found that wrinkles are more likely to occur when the outer diameter at the axial center of the region in the cylindrical winding member 1 where the film member 7a is wound (hereinafter sometimes abbreviated as the "winding region") is larger than the outer diameter at each of the axial ends of the region. In this embodiment, the region X shown in FIG. 3 corresponds to the winding region, the outer diameter D1 shown in FIG. 3 corresponds to the outer diameter at the axial center of the winding region, the outer diameter D2 shown in FIG. 3 corresponds to the outer diameter at the axial front end of the winding region, and the outer diameter D3 shown in FIG. 3 corresponds to the outer diameter at the axial rear end of the winding region.

The main cause of the phenomenon that wrinkles are easily generated as described above will be explained below with reference to Figure 4. Figure 4 shows a schematic diagram of the state in which the film member 7a on the elastic sheet 15 is pressed against the cylindrical winding member 1 when the outer diameter of the cylindrical winding member 1 at the axial center of the winding region is larger than the outer diameter at each of the axial ends of the region. Note that in this figure, the difference in outer diameter between the axial center and both ends is exaggerated for ease of explanation.

As shown in FIG. 4(a), the film member 7a on the elastic sheet 15 first comes into contact with the cylindrical winding member 1 at the axial center, where the outer diameter is larger. This causes the film member 7a and the cylindrical winding member 1 to fuse together at the axial center, and the position of the film member 7a relative to the cylindrical winding member 1 is fixed.

Then, when the film member 7a is gradually pressed against the cylindrical winding member 1, the two gradually come into contact from the axial center as shown in FIG. 4(b), and finally, as shown in FIG. 4(c), the two come into contact and are fused together over the entire axial area.

If we look at the stage shown in Figure 4(b), the film member 7a and the tubular member 1 are not in contact at both axial ends, and their positional relationship is not fixed. Therefore, while both axial ends of the film member 7a are pulled toward the center, the film member 7a is pressed against the tubular winding member 1, leading to the state shown in Figure 4(c). This process occurs sequentially in the circumferential direction of the tubular winding member 1 as the winding of the film member 7a progresses.

However, since the circumferential length of the cylindrical winding member 1 is shorter closer to both axial ends, the circumferential lengths of the cylindrical member 1 and the film member 7a are roughly the same in the axial center, but the circumferential length of the film member 7a becomes longer than that of the cylindrical winding member 1 closer to both axial ends. Therefore, as the winding of the film member 7a progresses, particularly near both axial ends, excess film member 7a is generated relative to the outer peripheral surface of the cylindrical winding member 1, and there is a risk of wrinkles occurring in the film member 7a.

When wrinkles occur in the film member 7a in this way, the gas barrier properties of the cartridge CT are impaired, and deterioration of the contents and other problems arise. In addition, if the film member 7a also serves as a label, the wrinkles can cause the label to look unattractive, which can be a problem.

Therefore, the applicant formed a cylindrical winding member 1 by injection molding so that the outer diameter at the axial center of the winding region was smaller than the outer diameter at each of the axial ends of the region. By using this cylindrical winding member 1, the applicant was able to carry out the winding process without causing wrinkles in the film member 7a.

Here, the main cause of eliminating wrinkles will be explained below with reference to Figure 5. Figure 5 shows a schematic diagram of the film member 7a on the elastic sheet 15 being pressed against the cylindrical winding member 1 when the outer diameter of the cylindrical winding member 1 at the axial center of the winding region is smaller than the outer diameter at each of the axial ends of the region. Note that in this figure, the difference in outer diameter between the axial center and both ends is exaggerated for ease of explanation.

As shown in FIG. 5(a), the film member 7a on the elastic sheet 15 first comes into contact with the cylindrical winding member 1 at both axial ends with the larger outer diameter. This causes the film member 7a and the cylindrical winding member 1 to fuse together at both axial ends, and the position of the film member 7a relative to the cylindrical winding member 1 is fixed.

When the film member 7a is then gradually pressed against the cylindrical winding member 1, as shown in FIG. 5(b), the two gradually come into contact from both axial ends, and finally, as shown in FIG. 5(c), the two come into contact and are fused over the entire axial area. In this way, the order in which the film member 7a presses against the outer circumferential surface of the cylindrical winding member 1 in the axial direction is such that the axial ends come before the axial center. Looking at the stage shown in FIG. 5(b), the film member 7a and the cylindrical winding member 1 are not in contact with each other at the axial center, and their positional relationship is not fixed.

However, as is clear from FIG. 5(a), between both axial ends (where the position of the film member 7a is fixed), the outer peripheral surface of the tubular winding member 1 is longer than the surface of the film member 7a that extends straight in the axial direction. As a result, when the elastic sheet 15 approaches the tubular member 1 with the positional relationship between the two fixed at both axial ends, the film member 7a comes into contact with the tubular winding member 1 while being stretched slightly, so no slack is generated in the film member 7a. As a result, the film member 7a can be wound around the tubular winding member 1 without causing wrinkles in the film member 7a.

If the difference in the outer diameter between the axial center and end portions of the tubular winding member 1 is made larger than necessary, proper fusion of the film member 7a and the tubular winding member 1 is hindered. Therefore, it is desirable to set the difference in outer diameter depending on the axial position just right. Taking this into consideration, the applicant made the outer diameter of each of the axial end portions of the tubular winding member 1 0.2% to 3% larger than the outer diameter at the axial center, and confirmed that the film member 7a and the tubular member 1 are properly fused while suppressing the occurrence of wrinkles. Therefore, it is preferable to make the outer diameter of each of the axial end portions of the tubular winding member 1 0.2% to 3% larger than the outer diameter at the axial center, and more preferably 0.2% to 1.5% larger.

The outer diameter of the winding region of the cylindrical winding member 1 may be gradually increased from the axial center toward each of the two ends, or may be constant near the axial center and increased only in the vicinity of each of the two ends. The thickness of the cylindrical winding member 1 is made roughly uniform throughout the entire axial region, making it difficult for molding shrinkage to occur and reducing the amount of resin required.

As described above, the cylindrical winding member 1 according to this embodiment has a film member 7a wound around its outer circumferential surface, and the outer diameter of each of the axial ends of the area around which the film member 7a is wound is made larger than the outer diameter at the axial center of the area. Therefore, the cylindrical winding member 1 makes it possible to prevent wrinkles in the film member 7a from occurring. Note that the winding member according to the present invention is not limited to a cylindrical shape, and may be a rod shape around which the film member can be wound.

Although the embodiment of the present invention has been described above, the configuration of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In other words, the above embodiment should be considered to be illustrative in all respects and not restrictive. The technical scope of the present invention is indicated by the claims, not the description of the above embodiment, and should be understood to include all modifications that are equivalent in meaning and scope to the claims.

The present invention can be used, for example, in containers for storing caulking materials and adhesives.

REFERENCE SIGNS LIST 1 Cylindrical winding member 1a Body portion 1b Canopy portion 2 Membrane 3 Plunger 4 Film member CT cartridge 10 Winding device 14 Drum 15 Elastic sheet 16 Motor 17 Suction pump 18 Sensor 19 Hot air generator 20 Spindle 21 Air cylinder

Claims (7)

a container comprising a tubular member having at least one open end, the entire member being an integrally molded product made of the same resin material, a barrier film member having a barrier layer bonded to an outer peripheral surface of the tubular member over the entire axial length thereof, the container defining an interior of the tubular member as a storage space,
The end opening has an inner diameter substantially equal to an inner diameter of the tubular member,
The cylindrical member, which is an integrally molded product made of the same resin material, is formed so that the outer diameter of each of the end opening and the opposite end is larger than the outer diameter of an axial center portion,
The barrier film member has its entire back surface bonded to the entire outer peripheral surface of the cylindrical member, with both ends corresponding to the surfaces of the outer peripheral surfaces of both ends of the cylindrical member. The container according to claim 1, characterized in that the outer diameter of each of the axial ends of the cylindrical member, which is an integrally molded product made of the same resin material, is 0.2% to 3% larger than the outer diameter at the axial center. 3. The container according to claim 1, wherein an opening smaller than an inner diameter of the cylindrical member is provided at an opposite end of the cylindrical member which is an integrally molded product made of the same resin material. A container according to any one of claims 1 to 3, characterized in that a movable body can be installed that has an outer diameter approximately equal to the inner diameter of the end opening, and that can slide in the axial direction along the inner circumferential surface of the cylindrical member between the end opening and the opposite end of the cylindrical member that is an integrally molded product made of the same resin material. The container according to any one of claims 1 to 4, characterized in that the barrier film member has an adhesive layer on at least the entire back surface, and the entire back surface is adhered via the adhesive layer to the entire outer circumferential surface of the cylindrical member, which is an integrally molded product made of the same resin material. A method for manufacturing a container according to any one of claims 1 to 5, comprising the steps of:
a winding step of winding and adhering the barrier film member while pressing the barrier film member against an outer peripheral surface of the cylindrical member which is an integrally molded product made of the same resin material,
a winding step for winding the barrier film member such that the outer peripheral surface of the barrier film member is axially pressed at both axial ends prior to the axial central portion of the barrier film member being wound around the outer peripheral surface of the barrier film member. A method for manufacturing a container according to any one of claims 1 to 4, comprising the steps of:
the tubular member and the barrier film member, which are integrally molded from the same resin material, have opposing surfaces formed from resin,
a winding step of winding the barrier film member around the outer circumferential surface and bonding the surfaces together,
The winding method is characterized in that the winding step is characterized in that the outer circumferential surface of the tubular member is axially pressed against both axial ends prior to the axial center.