Winding member, container, winding method, and method for manufacturing container

Abstract

To provide a winding member which is a member with an outer peripheral surface around which a film member is wound, and with which the film member is made difficult for wrinkles to occur.SOLUTION: There is provided a rod-shaped or cylindrical winding member with the outer peripheral surface around which a film member is wound, and of the winding member, the outer diameters of both ends in the axial direction of the area around which the film member is wound are larger than the outer diameter of the central part in the axial direction of the area.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] 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. [Background technology]

[0002] Conventionally, a cartridge in which a film material is wrapped around the entire outer periphery of a cylindrical member has been used as a cartridge for storing caulking material, adhesive, etc. For example, Fig. 1 of Patent Document 1 discloses a cartridge 1 formed so that the stored 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 main body 2 made of resin such as polyethylene.

[0003] The resin body 2 is cylindrical with approximately the same outer diameter, and one open end is sealed with a cover consisting of a polyethylene head 5 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 cylindrical container with a bottom.

[0004] 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 making it possible to maintain the quality of the contents in a 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.

[0005] 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 start and end of the film 7 are overlapped and adhered, so there is no gap between the two ends.

[0006] In the process of winding the film material around the entire outer periphery of the cylindrical main body 2, a device is used that winds 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 having 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 wind the film material, which is being rotated and transported by the drum, around the cylindrical main body 2. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4665951 Summary of the Invention [Problem to be solved by the invention]

[0008] The resin cylindrical body 2, which is an extrusion molded product, is formed into a container shape by fusing a separate resin head 5 to it. This means that the fusing process tends to increase the defect rate, and when the film material is wrapped around it, tiny wrinkles in the film material can form on the open end side.

[0009] The applicant attempted to omit the welding process by finishing the head 5 and the cylindrical body 2 as a one-piece molded product from resin, with the main objective of reducing the defective rate in the fusion process. That is, the applicant attempted to integrally mold a bottomed tubular member that would become a container by injection molding of resin.

[0010] However, when the aluminum laminate film is wrapped around and fused to the cylindrical portion of the 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 ends in the axial direction of the cylindrical portion).The occurrence of such wrinkles can impair the gas barrier properties and can deteriorate the appearance of the label.

[0011] 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 member is wrapped, larger than the outer diameter at the axial center of that area, the aluminum laminate film can be wrapped and fused without wrinkles.

[0012] That is, in the case of resin molded products, it is somewhat difficult in terms of molding precision to make the center and open end of the cylindrical 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 may shrink and become shorter, and depending on the degree of shortening, wrinkles may 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 problems.

[0013] Therefore, the applicant discovered that by making the diameter of the opening end larger than that of the center, contrary to the conventional idea of ​​making the diameter of the center and the ends of the cylindrical part 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 equal to or smaller than the diameter of the center, even if molding shrinkage occurs during resin molding, and also in terms of molding precision.

[0014] The reason why this phenomenon occurs is not clear, but it is thought that when the film material is wrapped around the film, the ends of the film material are crimped and fixed to the large diameter portion of the cylindrical portion before the center portion, and then the film material is crimped to the small diameter center portion, so the film material stretches slightly in the axial direction and tends to shrink circumferentially towards the center, so wrinkles do not form in the small diameter center portion in the circumferential direction (more details will be given in the explanation of the embodiments of the present invention).

[0015] 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, whose outer peripheral surface the film material is wrapped around, and is also effective, for example, when wrapping and adhering a protective film around a cylindrical member.

[0016] The present invention has been 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, which is a member having a film member wound around its outer peripheral surface and which makes it possible to prevent wrinkles from forming in the film member. [Means for solving the problem]

[0017] The winding member of the present invention is a rod-shaped or tubular winding member around whose outer peripheral surface a film material is wound, and is configured so that the outer diameter of each of the axial ends of the area around which the film material is wound is larger than the outer diameter at the axial center of the area.

[0018] According to this configuration, it is possible to prevent wrinkles from occurring in the film member wrapped around the outer peripheral surface. More specifically, the above configuration may be configured such that the outer diameter of each of the axial end portions is 0.2% to 3% larger than the outer diameter at the axial center portion.

[0019] The container according to the present invention is configured to use the above-described cylindrical winding member around which the film member having gas barrier properties is wound, and to be configured so that the contents can be stored inside the winding member. With this configuration, it is possible to enjoy the advantages of the winding member. In addition, in the container, the winding member may be a resin molded product having a cylindrical shape with a bottom.

[0020] A winding method according to the present invention is a winding method for winding the film member on an outer peripheral surface of a 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 the 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 to each other.

[0021] Furthermore, a manufacturing method for a container according to the present invention is a manufacturing method for a container having the above-mentioned configuration, which includes a winding step of winding the film member around an outer peripheral surface of the winding member, and in the winding step, the order of axial pressure welding of the outer peripheral surface of the film member is such that both axial ends are pressed before the axial central portion.

[0022] In the above manufacturing method, the winding member and the film member may have opposing surfaces formed of resin, and the winding process may be a process of winding the film member around the outer peripheral surface and adhering the surfaces to each other. Effect of the Invention

[0023] The winding member according to the present invention is a member around whose outer circumferential surface a film member is wound, and it is possible to prevent the film member from wrinkling. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is a configuration diagram of a cartridge CT according to the embodiment. [Diagram 2] 1 is a configuration diagram of a winding device according to an embodiment of the present invention. [Diagram 3] 3A and 3B are explanatory diagrams relating to a cylindrical winding member according to the embodiment. [Figure 4] FIG. 1 is an explanatory diagram regarding the main cause of the phenomenon that wrinkles are easily generated. [Diagram 5]FIG. 1 is an explanatory diagram regarding the main cause of eliminating the occurrence of wrinkles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. Note that the front-rear direction in the following description is merely defined for the sake of convenience so as to coincide with the axial direction of a cylindrical winding member.

[0026] 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 storing fluids such as caulking material and adhesives (hereinafter referred to as "contents").

[0027] The cylindrical winding member 1 in this embodiment is configured as a bottomed cylindrical member (resin molded product) integrally formed as a whole by injection molding of resin, and a top portion 1b having an opening OP is provided on the front side of a cylindrical body portion 1a. For example, polyethylene or the like can be used as the resin forming the cylindrical winding member 1. In this embodiment, the cylindrical winding member 1 is adapted to accommodate 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.

[0028] The canopy 1b has a discharge port protruding forward from the center front side of the disk-shaped portion with the axial direction being the front-rear direction. An opening OP extending in the front-rear direction is formed in 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.

[0029] The membrane 2 is a thin film-like member arranged inside the tubular member 1 to cover the opening OP, and is formed by laminating, for example, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, aluminum foil, and a polyethylene (PE) film.

[0030] 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, and the outer diameter is set to be equal to or slightly larger than the inner diameter of the body part 1a. The plunger 3 is fitted into the rear opening end of the body part 1a so that the bottom side faces forward. Grease is provided between the plunger 3 and the body part 1a to reduce sliding resistance and allow the plunger 3 to move smoothly. This grease also serves to prevent the ingress and egress of gas, moisture, etc. in the gap between the plunger 3 and the body part 1a, and functions as a lubricant with high barrier properties.

[0031] 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 circumferential surface of the cylindrical winding member 1 (corresponding to the outer circumferential surface of the body portion 1a in this embodiment) so as to entirely cover the outer circumferential 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 maintains the quality of the contents.

[0032] 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 a resin layer) in this order. Furthermore, the film member 7a may have characters, designs, etc. printed on its surface so as to function as a label for the cartridge CT.

[0033] When the cartridge CT is unopened, the opening OP is sealed by the membrane 2 to maintain the quality of the contents, and when in use, the opening OP can be opened by breaking the membrane 2 to release the contents. When in use, by setting the cartridge CT in a dedicated tool (for example, a handgun), the user can easily push out an appropriate amount of the contents by moving the plunger 3 forward with a simple operation.

[0034] 2. Cartridge manufacturing method The cartridge CT having the above-described configuration is manufactured through processes such as a process of winding a film member 7a around the outer peripheral surface of the cylindrical winding member 1, a process of providing a 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 a plunger 3 on the rear side of the cylindrical winding member.

[0035] 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 (Japanese Patent No. 4665951), so only a brief description will be given here.

[0036] 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.

[0037] 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, a predetermined length of the film material 7 (a length corresponding to the outer circumferential dimension of the tubular member 1) is sent toward the drum 14, 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 on the spindle 20.

[0038] 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 onto the elastic sheet 15 by suction.

[0039] After the conveyance of the film member 7a has started, 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. Since the spindle 20 is freely rotatable with the tubular winding member 1 fitted therein, 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 thereto, the film member 7a is wound around the outer circumferential surface of the tubular winding member 1 from the leading end side in the conveyance direction.

[0040] More specifically, 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 conveying direction, and is then pressed against the cylindrical winding member 1 by the elastic force of the elastic sheet 15 (see Figs. 4 and 5 described below). As the drum 14 rotates, a similar phenomenon occurs sequentially toward the trailing end in the conveying direction, allowing the film member 7a to be wound around the cylindrical winding member 1 while being pressed against it.

[0041] 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 when the predetermined time has elapsed and the film member 7a reaches a position where the hot air hits it, the hot air generator 19 moves to a position close to the drum 14. 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.

[0042] 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 convecting hot air heats the surface of the cylindrical winding member 1. As a result, when the film member 7a with the melted layer of heat-sensitive adhesive is wound 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. Furthermore, ultimately, the film member 7a is bonded to the entire outer periphery of the cylindrical winding member 1.

[0043] In this embodiment, the opposing surfaces of the cylindrical winding member 1 and the film member 7a are formed of resin, and the winding step is a step of winding the film member 7a around the outer peripheral surface of the cylindrical winding member 1 and bonding the surfaces together. Specific examples of the step 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.

[0044] 3. Outer diameter of 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.

[0045] 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 top portion 1b.

[0046] It was found that wrinkles are likely to occur when the outer diameter at the axial center of the region of the cylindrical winding member 1 where the film member 7a is wound (hereinafter sometimes abbreviated as "winding region") is larger than the outer diameters at both axial ends of the region. In the example of 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.

[0047] The main cause of the phenomenon that wrinkles are easily generated as described above will be explained below with reference to Fig. 4. Fig. 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 in the case where the outer diameter of the cylindrical winding member 1 at the axial center of the winding region is larger than the outer diameters at both axial ends of the region. Note that in this figure, the difference in the outer diameter between the axial center and both ends is exaggerated for ease of explanation.

[0048] 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 portion where the outer diameter is large. As a result, the film member 7a and the cylindrical winding member 1 are fused together at the axial center portion, and the position of the film member 7a relative to the cylindrical winding member 1 is fixed.

[0049] Thereafter, when the film member 7a is gradually pressed against the tubular 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 over the entire axial region.

[0050] 4(b), the film member 7a and the cylindrical member 1 are not in contact with each other at both axial ends, and their positional relationship is not fixed. Therefore, the film member 7a is pressed against the cylindrical winding member 1 while both axial ends of the film member 7a are pulled toward the center, and the state shown in FIG. 4(c) is reached. This process occurs sequentially in the circumferential direction of the cylindrical winding member 1 as the winding of the film member 7a progresses.

[0051] 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 circumferential surface of the cylindrical winding member 1, and wrinkles may occur in the film member 7a.

[0052] If wrinkles occur in the film member 7a in this way, the gas barrier properties of the cartridge CT are impaired, causing problems such as deterioration of the contents contained therein, etc. 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.

[0053] The applicant then formed a tubular 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, and by using this tubular winding member 1, the applicant was able to carry out the winding process without causing wrinkles in the film member 7a.

[0054] Here, the main reason why wrinkles are eliminated will be described below with reference to Fig. 5. Fig. 5 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 in the case where the outer diameter of the cylindrical winding member 1 at the axial center of the winding region is smaller than the outer diameters at both axial ends of the region. Note that in this figure, the difference in the outer diameter between the axial center and both ends is exaggerated for ease of explanation.

[0055] 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 a larger outer diameter. As a result, the film member 7a and the cylindrical winding member 1 are fused together at both axial ends, and the position of the film member 7a relative to the cylindrical winding member 1 is fixed.

[0056] Thereafter, when the film member 7a is 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 region. 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. Here, focusing on 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.

[0057] However, between both axial ends (where the position of the film member 7a is fixed), as is clear from Fig. 5(a), the outer peripheral surface of the cylindrical 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 cylindrical member 1 with the positional relationship between the two axial ends fixed, the film member 7a comes into contact with the cylindrical 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 cylindrical winding member 1 without causing wrinkles in the film member 7a.

[0058] In addition, if the difference in the outer diameter between the axial center and the end portions of the cylindrical winding member 1 is made larger than necessary, proper fusion of the film member 7a and the cylindrical winding member 1 is hindered. Therefore, it is desirable to set the difference in the outer diameter depending on the axial position without being excessive or insufficient. Taking this into consideration, the applicant has confirmed that the film member 7a and the cylindrical winding member 1 are properly fused while suppressing the occurrence of wrinkles by making the outer diameter of each of the axial end portions of the cylindrical winding member 1 larger by 0.2% to 3% than the outer diameter at the axial center. Therefore, it is preferable to make the outer diameter of each of the axial end portions of the cylindrical winding member 1 larger by 0.2% to 3% than the outer diameter at the axial center, and more preferably by 0.2% to 1.5%.

[0059] 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 wall thickness of the cylindrical winding member 1 is made roughly uniform over the entire axial region, so that molding shrinkage is unlikely to occur and the amount of resin required is reduced.

[0060] 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 diameters of both axial ends of the region around which the film member 7a is wound are made larger than the outer diameter at the axial center of the region. 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.

[0061] 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 is an example in all respects and should be considered as 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 fall within the meaning and scope of the claims. [Industrial Applicability]

[0062] The present invention can be used, for example, in containers for storing caulking materials or adhesives. [Explanation of symbols]

[0063] 1. Cylindrical winding member 1a Body 1b Canopy 2. Membrane 3 Plunger 4 Film materials CT Cartridge 10 Winding device 14 Drums 15 Elastic sheet 16 Motor 17 Suction pump 18 Sensors 19 Hot air generator 20 Spindle 21 Air Cylinder

Claims

1. 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.

2. The container according to claim 1, characterized in that the outer diameter of each of the axial ends of the tubular member, which is a single piece molded product made of the same resin material, is 0.2% to 3% larger than the outer diameter at the axial center portion.

3. 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.

4. A container as described in any one of claims 1 to 3, characterized in that a movable body can be installed which has an outer diameter approximately equal to the inner diameter of the end opening and is capable of sliding axially along the inner surface of the tubular member which is a one-piece molded product made of the same resin material between the end opening and the opposite end of the tubular member.

5. 5. A container as described in 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 peripheral surface of the tubular member which is an integrally molded product made of the same resin material.

6. 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.

7. 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.

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