Manufacturing method of the body section

Abstract

To provide a method for manufacturing a trunk split body, capable of forming a barrier layer with desired shape and thickness.SOLUTION: A method for manufacturing a trunk split body is provided with a first barrier layer 60 so as to cover the inner peripheral surface of a trunk substrate 50, has the trunk substrate 50 and the first barrier layer 60, and manufactures a trunk split body 20 that constitutes a pressure container 10 by being united with a dome split body 30. The first barrier layer 60 is formed by winding a film member 70 having barrier properties around the outer periphery of a mandrel 80 in a cylindrical shape, a resin-impregnated fiber 55 is wound around the first barrier layer 60, resin is cured to form the trunk substrate 50, and the trunk split body 20 is pulled out from the mandrel 80.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a body section. [Background technology]

[0002] The pressure vessel disclosed in Patent Document 1 comprises a liner with gas barrier properties and an outer shell made of FRP that covers the outside of the liner. The liner is made of a synthetic resin such as high-density polyethylene. The outer shell is made of fiber bundles containing carbon fiber and glass fiber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-21099 Summary of the Invention [Problem to be solved by the invention]

[0004] The pressure vessel of Patent Document 1 has an outer shell formed by wrapping a fiber bundle around the outer peripheral surface of the liner using filament winding. Therefore, in order to ensure the rigidity of the liner, the liner is formed to a thickness greater than that required to ensure barrier properties. This has led to problems such as increased manufacturing costs for the pressure vessel.

[0005] The present invention was completed in light of the above circumstances, and an object of the present invention is to provide a method for manufacturing a trunk section that is capable of forming a barrier layer of a desired shape and thickness. [Means for solving the problem]

[0006] The method for manufacturing a trunk section of the present invention comprises the steps of: 1. A method for manufacturing a body section segment that comprises a body base and a barrier layer covering an inner peripheral surface of the body base, the body section segment constituting a pressure vessel when combined with a dome section segment, comprising: a film member having barrier properties is wound around the outer periphery of a mandrel to form a cylindrical barrier layer; a resin-impregnated fiber is wound around the barrier layer, and the resin is cured to form the body base, and the body base and the barrier layer are integrated together; The body section is removed from the mandrel. [Effects of the Invention]

[0007] According to the present invention, a barrier layer is formed by winding a film member having barrier properties around the outer periphery of a mandrel into a cylindrical shape. Therefore, by adjusting the width dimension of the film member and the number of windings around the mandrel, a barrier layer of a desired shape and thickness can be formed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing a pressure vessel of Example 1. [Figure 2] FIG. 1 is a cross-sectional view of a pressure vessel. [Figure 3] 3 is an enlarged cross-sectional view showing the vicinity of the boundary between the body section segment and the dome section segment in FIG. 2. FIG. [Figure 4] 1A and 1B are explanatory diagrams illustrating the manufacturing process of the body section, where (A) is an explanatory diagram of the process of fixing one end of the film member to the mandrel, (B) is an explanatory diagram of the process of joining both ends of the film member, (C) is an explanatory diagram of the process of winding resin-impregnated fiber around the outer periphery of the first barrier layer, (D) is an explanatory diagram of the process of hardening the resin to form the body section, and (E) is an explanatory diagram of the process of pulling the body section from the mandrel. [Figure 5] 10A and 10B are explanatory diagrams illustrating a part of the manufacturing process of the body section body of Example 2, where (A) is an explanatory diagram of the process of winding a film member around a mandrel, and (B) is an explanatory diagram of the process of joining both ends of the film member. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the method for manufacturing a trunk section of the present invention, during the process of winding the film member around the mandrel, it is preferable that the film member is held at a predetermined position on the outer peripheral surface of the mandrel by a holding member while the film member is wound around the outer peripheral surface and the other end portion is joined to the one end portion of the film member. It is preferable that the holding member holds the film member at a position closer to the other end portion than the one end portion. In this way, because the holding member holds the film member at a position closer to the other end portion than the one end portion, interference between the holding member and the other end portion of the film member can be prevented when joining the one end portion and the other end portion of the film member.

[0010] In the method for manufacturing a body section of the present invention, the barrier layer is preferably formed by winding a sheet-like film member having a width dimension along the axis of the mandrel larger than that of the body base body around the outer periphery of the mandrel to form a cylindrical shape. By using a sheet-like film member having a width dimension along the axis of the mandrel larger than that of the body base body, the number of film member winding steps required to form a barrier layer of the same width dimension can be reduced compared to when using a film member having a width dimension smaller than that of the body base body.

[0011] In the method for manufacturing a body section of the present invention, it is preferable that the barrier layer is formed by spirally winding a strip-shaped film member having a width dimension along the axis of the mandrel smaller than that of the body base body around the outer periphery of the mandrel to form a cylindrical shape. In this way, by using a strip-shaped film member having a width dimension along the axis of the mandrel smaller than that of the body base body, the width dimension and diameter of the barrier layer can be changed by adjusting the number of windings of the film member.

[0012] In the manufacturing method of the body section of the present invention, it is preferable that the winding area of ​​the barrier layer around the mandrel is larger than the winding area of ​​the body base body around the mandrel, thereby making it possible to make the barrier layer protrude in the axial direction relative to the body base body and to cover the axial end face of the body base body with the barrier layer.

[0013] In the method for producing a body section of the present invention, the body base body is formed by heating and curing a resin, and the linear expansion coefficient of the barrier layer is preferably greater than the linear expansion coefficient of the mandrel, so that after the temperature is reduced after heating, a gap is generated between the mandrel and the barrier layer, making it easier for the barrier layer to separate from the mandrel and the barrier layer to be removed from the mandrel.

[0014] In the method for producing a body segment of the present invention, the body base is formed by heating and curing a resin, and the coefficient of linear expansion of the barrier layer is preferably larger than the coefficient of linear expansion of the body base, thereby making it less likely that a gap will form between the barrier layer and the body base, and improving adhesion between the barrier layer and the body base.

[0015] Example 1 A first embodiment of the present invention will be described below with reference to FIGS.

[0016] (Configuration of pressure vessel) The pressure vessel 10 of this embodiment has a cylindrical capsule shape, as shown in Figure 1. The pressure vessel 10 is mounted on a vehicle, for example, and used as a container filled with high-pressure hydrogen gas. Note that in the pressure vessel 10 shown in Figures 1 to 4, the diameter, axial length, thickness of each layer, etc. are exaggerated, and the configuration shown in Figures 1 to 4 is merely an example.

[0017] As shown in Figure 2, the pressure vessel 10 comprises a body section 20, a dome section section 30, and an external reinforcing layer 40. The pressure vessel 10 is formed by combining the body section 20 and the dome section section 30. The external reinforcing layer 40 surrounds the combined body section 20 and dome section section 30. The pressure vessel 10 is provided with a nozzle 11 as shown in Figure 1. Note that Figure 2 shows the pressure vessel 10 before the nozzle 11 is attached. The pressure vessel 10 has barrier properties. In this Example 1, barrier properties are defined as the ability to prevent or inhibit a fluid (such as hydrogen gas) filled inside the pressure vessel 10 from permeating the pressure vessel 10 and leaking to the outside of the pressure vessel 10.

[0018] As shown in FIG. 2, the body segment 20 has a body base body 50 and a first barrier layer 60. The body base body 50 is cylindrical and long in the axial direction (direction along the axis L). The inner diameter of the body base body 50 is constant over its entire length. The outer diameter of the body base body 50 is constant over its entire length, excluding a recess 51 (described later). The body base body 50 is made of fiber-reinforced resin such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The body base body 50 is formed by hoop-winding, for example, a fiber bundle (not shown) impregnated with a liquid thermosetting resin, or a fiber bundle impregnated with a thermosetting resin that has been brought to a semi-cured state (prepreg fiber) using a filament winding method. The fiber bundle is made of a bundle of thread-like fibers such as carbon fiber, glass fiber, or Kepler fiber.

[0019] As shown in FIG. 3, recesses 51 are provided on both axial ends of the outer peripheral surface of the barrel base body 50. The recesses 51 are provided around the entire circumference of the axis. The portion of the barrel base body 50 where the recesses 51 are provided is thinner than the other portion of the barrel base body 50 (the portion toward the center in the axial direction). The outer dimensions of the recesses 51 decrease toward the outside in the axial direction. The recesses 51 include a first tapered portion 51A and a second tapered portion 51B. The first tapered portion 51A and the second tapered portion 51B form a two-step slope. The slope angle of the first tapered portion 51A is larger than the slope angle of the second tapered portion 51B.

[0020] As shown in FIG. 2, the first barrier layer 60 is provided to cover the inner peripheral surface of the body base body 50. The first barrier layer 60 corresponds to an example of the "barrier layer" of the present disclosure. The first barrier layer 60 has barrier properties. Examples of materials that can be used for the first barrier layer 60 include EVOH (ethylene-vinyl alcohol copolymer) and PA6 (nylon 6). The first barrier layer 60 is used for the purpose of blocking or inhibiting the fluid stored in the pressure vessel 10 from permeating to the outside.

[0021] As shown in Fig. 3, the first barrier layer 60 covers both axial ends of the barrel base body 50. Both axial ends of the first barrier layer 60 that protrude from both axial ends of the barrel base body 50 are folded back to cover both axial ends of the outer peripheral surface of the barrel base body 50. Specifically, the first barrier layer 60 covers the recess 51 (first tapered portion 51A, second tapered portion 51B), the first end face 52A, and the second end face 52B. The first end face 52A is an end face in the axial direction of the barrel base body 50. The second end face 52B is an end face that continues toward the axial center with respect to the second tapered portion 51B.

[0022] As shown in FIG. 2, the dome section segment 30 has a dome section base 31 and a second barrier layer 32. The dome section base 31 is a hemispherical portion connected to the longitudinal end of the body base 50. The diameter of the dome section base 31 decreases with increasing distance from the body base 50. The thickness of the dome section base 31 is smaller than the thickness of the body base 50 (the thickness of the portion excluding the recess 51). The dome section base 31 is made of a fiber-reinforced resin such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The dome section base 31 is formed by, for example, laminating fiber bundles (not shown) impregnated with a liquid thermosetting resin or fiber bundles impregnated with a semi-cured thermosetting resin (prepreg fiber) by, for example, a hand layup method, and then dividing the molded product into halves. The fiber bundle is made by bundling thread-like fibers made of carbon fiber, glass fiber, Kepler fiber, etc. At the top of the dome section segment 30, a mouthpiece 11 is provided, as shown in FIG.

[0023] 2, the second barrier layer 32 is provided so as to cover the inner peripheral surface of the dome portion base body 31. The second barrier layer 32 has the same configuration as the first barrier layer 60. The end of the second barrier layer 32 on the trunk section 20 side covers the end face 31A of the dome portion base body 31.

[0024] 3, the end of the body section section 20 is inserted inside the end of the dome section section 30, and the body section 20 and the dome section section 30 are joined together. The first barrier layer 60 covering the end of the body section section 20 (more specifically, the first tapered section 51A, the second tapered section 51B, and the second end face 52B) is in contact with the second barrier layer 32 covering the end of the dome section section 30. The first barrier layer 60 and the second barrier layer 32, which are in contact with each other, are crushed by the end of the body section section 20 and the end of the dome section section 30, generating a repulsive force (restoring force), and ensuring sealing at the boundary between the body section base body 50 and the dome section base body 31.

[0025] The external reinforcing layer 40 is made of a fiber-reinforced resin, such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The external reinforcing layer 40 is formed so as to cover the entire outer periphery of the body section segment 20 and the entire outer periphery of the dome section segment 30. The external reinforcing layer 40 is formed by helically winding, for example, by a filament winding method. The external reinforcing layer 40 is formed by winding, for example, fiber bundles (not shown) impregnated with liquid thermosetting resin or fiber bundles impregnated with thermosetting resin in a semi-cured state (prepreg fiber) around the outer surfaces of the body section segment 20 and the dome section segment 30, which rotate around the axis L (see FIG. 2). The fiber bundles are made by bundling thread-like fibers made of carbon fiber, glass fiber, Kepler fiber, or the like.

[0026] (Method of manufacturing the trunk section segments) Next, a manufacturing method of the body section 20 will be described. First, as shown in Fig. 4(A), one end 71 of a film member 70 having barrier properties is fixed to the outer peripheral surface of a cylindrical mandrel 80. Examples of materials that can be used for the film member 70 include EVOH (ethylene-vinyl alcohol copolymer) and PA6 (nylon 6). The film member 70 is in a sheet form. Examples of materials that can be used for the mandrel 80 include metals (aluminum, iron, etc.).

[0027] The width of the film member 70 (the width along the axis 81 of the mandrel 80) is set to be larger than the width of the body base 50 (the width along the axis 81 of the mandrel 80) to be formed in a later step. In other words, the winding area of ​​the first barrier layer 60 around the mandrel 80 is set to be larger than the winding area of ​​the body base 50 around the mandrel 80.

[0028] As shown in FIG. 4A , one end 71 of the film member 70 is held by a holding member 90 at a predetermined position on the outer circumferential surface of the mandrel 80. The one end 71 of the film member 70 is arranged parallel to the axis 81 of the mandrel 80. The holding member 90 is made of, for example, a metal material. The holding member 90 is configured in a block shape. The surface (pressing surface) of the holding member 90 that comes into contact with the film member 70 may be flat or may be configured as a curved surface corresponding to the outer circumferential surface of the film member 70. The one end 71 of the film member 70 is clamped between the outer circumferential surface of the mandrel 80 and the pressing surface of the holding member 90. The holding member 90 holds the film member 70 at a position closer to the other end 72 than the one end 71 (e.g., a position several millimeters closer to the other end 72). This prevents interference between the holding member 90 and the other end 72 when joining the two ends 71, 72 of the film member 70.

[0029] Next, as shown in FIG. 4(B), the other end 72 of the film member 70 is wound around the outer peripheral surface of a mandrel 80 into a cylindrical shape, and the other end 72 is joined to the one end 71. The joining of the two ends 71, 72 of the film member 70 is performed, for example, by applying pressure and heat using a holding member 90. This results in a cylindrical first barrier layer 60. In this way, the first barrier layer 60 is formed by winding the film member 70 as a base using the mandrel 80. Therefore, by adjusting the width of the film member 70 and the number of turns around the mandrel 80, it is possible to form the first barrier layer 60 with a desired shape and thickness. Furthermore, by using a sheet-like film member 70 as a base, it is possible to form the first barrier layer 60 with a smaller number of turns of the film member 70, thereby reducing the amount of film member 70 used.

[0030] Next, as shown in FIG. 4(C), resin-impregnated fiber 55 is wound around the outer peripheral surface of the first barrier layer 60. The resin-impregnated fiber 55 is, for example, a fiber bundle (such as a bundle of carbon fibers) impregnated with a liquid thermosetting resin (such as an epoxy resin), or a fiber bundle impregnated with a thermosetting resin that has been semi-cured (prepreg fiber). The resin-impregnated fiber 55 is wound around the first barrier layer 60 by a filament winding method. The winding area of ​​the trunk base body 50 around the mandrel 80 is set smaller than the winding area of ​​the first barrier layer 60 around the mandrel 80. When winding the resin-impregnated fiber 55, the thickness of the bundle of resin-impregnated fiber 55 at both axial ends may be reduced so that the above-mentioned recesses 51 are formed. Note that the winding thickness of the resin-impregnated fiber 55 may be uniform in the axial direction, and the recesses 51 may be formed by cutting or the like after the trunk segment 20 is formed.

[0031] Next, the resin contained in the resin-impregnated fibers 55 is cured. For example, the resin contained in the resin-impregnated fibers 55 is cured by heating at 150°C for 40 minutes. As a result, a cylindrical body base body 50 is formed as shown in FIG. 4(D). Both axial ends 60A of the first barrier layer 60 protrude outward beyond both axial ends of the body base body 50. By making the first barrier layer 60 protrude in the axial direction relative to the body base body 50, the first barrier layer 60 can cover up to the axial end faces of the body base body 50 (more specifically, the recess 51, the first end face 52A, and the second end face 52B shown in FIG. 3). The heating brings the body base body 50 and the first barrier layer 60 into close contact with each other, and a body segment 20 is formed in which the body base body 50 and the first barrier layer 60 are integrated.

[0032] Here, the linear expansion coefficient of the first barrier layer 60 is set to be larger than the linear expansion coefficient of the mandrel 80. For example, the first barrier layer 60 is made of EVOH (ethylene-vinyl alcohol copolymer), and the mandrel 80 is made of aluminum. Therefore, after the temperature drops after heating, the first barrier layer 60 tends to separate from the mandrel 80, and a gap tends to form between the mandrel 80 and the first barrier layer 60, making it easier to separate the first barrier layer 60 from the mandrel 80 in a subsequent process.

[0033] Furthermore, the linear expansion coefficient of the first barrier layer 60 is set to be larger than the linear expansion coefficient of the barrel substrate 50. As a result, gaps are less likely to occur between the first barrier layer 60 and the barrel substrate 50, and the adhesion between the first barrier layer 60 and the barrel substrate 50 can be improved.

[0034] 4(E), the body section 20 is removed from the mandrel 80. When the body section 20 is removed, the body section 20 may be at a temperature of about 50°C due to residual heat from the heating during resin curing.

[0035] (Effects of this embodiment) The effects of the present embodiment 1 will be described below. In the manufacturing method of the body section of the present embodiment 1, the first barrier layer 60 is formed by winding a film member 70 having barrier properties around the outer periphery of a mandrel 80 to form a cylindrical shape. Therefore, by adjusting the width dimension of the film member 70 and the number of windings around the mandrel 80, it is possible to form the first barrier layer 60 with a desired shape and thickness. This eliminates the need for a mold for forming the barrier layer, thereby reducing the manufacturing cost of the body section 20. Furthermore, in conventional methods, resin-impregnated fibers are wound around the barrier layer by a filament winding method, using the barrier layer as a mandrel. This results in the barrier layer being thicker than necessary to ensure its barrier properties in order to ensure its rigidity. In contrast, in the manufacturing method of the body section of the present embodiment 1, it is not necessary to provide the first barrier layer 60 with the functionality of a mandrel, and the first barrier layer 60 can be made thinner, thereby reducing the manufacturing cost.

[0036] In the manufacturing method of the torso section body of this Example 1, the holding member 90 holds the film member 70 at a position closer to the other end 72 than the one end 71, thereby preventing interference between the holding member 90 and the other end 72 when joining the one end 71 and the other end 72 of the film member 70.

[0037] The manufacturing method of the body section of this Example 1 involves winding a sheet-like film member 70, which has a width dimension along the axis 81 of the mandrel 80 larger than that of the body base body 50, around the outer periphery of the mandrel 80 to form a cylindrical shape, to form the first barrier layer 60. By using a sheet-like film member 70 which has a width dimension along the axis 81 of the mandrel 80 larger than that of the body base body 50 in this way, the number of winding steps for the film member 70 can be reduced when forming a first barrier layer 60 of the same width dimension, compared to when using a film member 70 which has a width dimension smaller than that of the body base body 50.

[0038] In the manufacturing method of the body section of this Example 1, the winding range of the first barrier layer 60 around the mandrel 80 is larger than the winding range of the body base body 50 around the mandrel 80. This allows the first barrier layer 60 to protrude in the axial direction relative to the body base body 50, and the first barrier layer 60 can cover up to the first axial end face 52A of the body base body 50.

[0039] In the manufacturing method of the body section of this Example 1, the body base body 50 is formed by heating and curing the resin. The linear expansion coefficient of the first barrier layer 60 is greater than the linear expansion coefficient of the mandrel 80. As a result, after the temperature drops after heating, a gap is generated between the mandrel 80 and the first barrier layer 60, making it easier for the first barrier layer 60 to separate from the mandrel 80.

[0040] In the manufacturing method of the body section of this Example 1, the body base body 50 is formed by heating and curing the resin, and the linear expansion coefficient of the first barrier layer 60 is greater than the linear expansion coefficient of the body base body 50. This makes it less likely that a gap will form between the first barrier layer 60 and the body base body 50, and improves the adhesion between the first barrier layer 60 and the body base body 50.

[0041] <Example 2> A second embodiment of the present invention will be described below with reference to Fig. 5. The method for manufacturing the trunk section of the second embodiment differs from that of the first embodiment in the way the film member is wrapped around it, but the other configurations are the same as those of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0042] In the manufacturing method of the trunk section 20 of Example 2, a strip-shaped film member 270 having barrier properties is used as shown in Fig. 5. The material of the film member 270 is the same as that of the film member 70, and examples of the material that can be used include EVOH (ethylene-vinyl alcohol copolymer), PA6 (nylon 6), etc.

[0043] The width of the film member 270 (the width along the axis 81 of the mandrel 80) is set to be smaller than the width of the body base 50 (the width along the axis 81 of the mandrel 80) to be formed in a later step. The wrapping area of ​​the first barrier layer 260 around the mandrel 80 is set to be larger than the wrapping area of ​​the body base 50 around the mandrel 80.

[0044] As shown in FIG. 5(A), one end of the film member 270 is fixed at a predetermined position on the outer periphery of the mandrel 80, while the other end of the film member 270 is spirally wound around the outer periphery of the mandrel 80 to form a cylindrical shape.

[0045] 5(B), the other end of the film member 270 is joined to another location to form the first barrier layer 260. In this way, by using a strip-shaped film member 270 whose width along the axis 81 of the mandrel 80 is smaller than that of the barrel base body 50, the width and diameter of the first barrier layer 60 can be changed by adjusting the number of turns of the film member 270. Therefore, by adjusting the number of turns of the film member 70 around the mandrel 80, it is possible to form a first barrier layer 60 with a desired shape and thickness.

[0046] The steps of winding the resin-impregnated fiber 55, curing the resin, and pulling the trunk segment 20 from the mandrel 80 are the same as those in the first embodiment.

[0047] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. (1) In the first and second embodiments, the mandrel 80 is cylindrical, but it may have other shapes (such as a cylindrical shape with an elliptical cross section). (2) In the above-described first and second embodiments, the two end portions 71 and 72 of the film member 70 are joined by applying pressure and heat, but ultrasonic welding or the like may also be used. [Explanation of symbols]

[0048] 10...Pressure vessel 11...Socket 20...Body division 30...Dome section division body 31...Dome base 31A…End face 32...Second barrier layer 40...External reinforcement layer 50...Body base 51...recess 51A...First tapered section 51B...Second tapered section 52A…First end surface 52B…Second end surface 55...Resin-impregnated fiber 60...First barrier layer (barrier layer) 60A...end 70...Film material 71...One end 72...Other end 80…Mandrel 81...Axis 90...Holding member 260...First barrier layer 270...Film material L: Axis of the body section

Claims

1. 1. A method for manufacturing a body section segment that comprises a body base and a barrier layer covering an inner peripheral surface of the body base, the body section segment constituting a pressure vessel when combined with a dome section segment, comprising: a film member having barrier properties is wound around the outer periphery of a mandrel to form a cylindrical barrier layer; a resin-impregnated fiber is wound around the barrier layer, and the resin is cured to form the body base, and the body base and the barrier layer are integrated together; The body section is removed from the mandrel. In the process of winding the film member around the mandrel, the film member is held at a predetermined position on the outer peripheral surface of the mandrel by a holding member, while the film member is wound around the outer peripheral surface and one end of the film member is joined to the other end of the film member; The holding member holds the film member at a position closer to the other end than the one end.

2. 1. A method for manufacturing a body section segment that comprises a body base and a barrier layer covering an inner peripheral surface of the body base, the body section segment constituting a pressure vessel when combined with a dome section segment, comprising: a film member having barrier properties is wound around the outer periphery of a mandrel to form a cylindrical barrier layer; a resin-impregnated fiber is wound around the barrier layer so that a winding area of ​​the barrier layer around the mandrel is larger than a winding area of ​​the barrel base around the mandrel, and the resin is cured to form the barrel base and integrate the barrel base and the barrier layer; the axial ends of the barrier layer that protrude from both axial ends of the barrel base body are folded back to cover both axial ends of the outer peripheral surface of the barrel base body; The method for manufacturing a body section includes separating the body section from the mandrel.

3. 3. The method for manufacturing a trunk section body according to claim 1 or 2, wherein the barrier layer is formed by wrapping the sheet-like film member, which has a width dimension along the axis of the mandrel larger than that of the trunk section base body, around the outer periphery of the mandrel to form a cylindrical shape.

4. 3. The method for manufacturing a barrel section body according to claim 2, wherein the barrier layer is formed by spirally winding the strip-shaped film member, which has a width dimension along the axis of the mandrel smaller than that of the barrel base body, around the outer periphery of the mandrel to form a cylindrical shape.

5. The method for manufacturing a body section according to claim 1 or claim 3 which relies on claim 1, wherein the winding range of the barrier layer around the mandrel is larger than the winding range of the body base body around the mandrel.

6. forming the body base body by heating and curing the resin; The method for manufacturing a body section according to any one of claims 1 to 5, wherein the barrier layer has a linear expansion coefficient greater than a linear expansion coefficient of the mandrel.

7. forming the body base body by heating and curing the resin; The method for manufacturing a body section according to any one of claims 1 to 6, wherein the barrier layer has a linear expansion coefficient greater than a linear expansion coefficient of the body base body.

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