JP6337398B2 - Manufacturing method of composite container and composite container - Google Patents

Description

  The present invention relates to a method for manufacturing a composite container, and a composite container.

  Conventionally, as described in Patent Document 1, for example, a manufacturing method for manufacturing a composite container provided with a reinforcing layer is known. In such a manufacturing method, the reinforcing layer is formed on the outer peripheral side of the liner by supplying fiber bundles from a plurality of yarn supplying portions provided around the central axis of the liner and winding the bundle around the liner.

Table 2010-125651

  The manufacturing time of a composite container can be shortened by employ | adopting the manufacturing method which winds a fiber bundle around a liner using a some yarn feeding part as mentioned above. Thus, in the manufacturing method which manufactures a composite container using a some yarn feeding part, improving the intensity | strength of the composite container with respect to the quantity of the fiber bundle to be used was calculated | required.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a method for manufacturing a composite container and a composite container that can improve the strength of the composite container with respect to the amount of fiber bundle to be used.

  In order to solve the above-mentioned problems, a composite container manufacturing method according to the present invention is provided with a plurality of cylinders around a central axis of a liner having a cylindrical body and a dome formed on both ends of the body. A method of manufacturing a composite container in which a fiber bundle is supplied and wound from a supplied yarn supplying unit and a reinforcing layer is formed on the outer peripheral side of the liner, wherein a plurality of yarn supplying units supply the fiber bundle to the liner Rotates relative to the plurality of yarn supplying portions around the central axis, and the liner moves relative to the plurality of yarn supplying portions in the axial direction so that a fiber bundle is wound around the liner and a reinforcing layer is formed. The reinforcing layer forming step includes a first winding step of changing the winding angle of the fiber bundle around the liner in accordance with the change in the winding position of the fiber bundle in the axial direction.

  In the manufacturing method of the composite container according to the present invention, the reinforcing layer forming step of forming the reinforcing layer by winding the fiber bundle around the liner changes the winding angle of the fiber bundle around the liner according to the change in the winding position of the fiber bundle in the axial direction. Including a first winding step. Thus, by changing the winding angle in accordance with the change in the winding position of the fiber bundle in the axial direction, it becomes easy to adjust the condition of the winding angle, thereby making it easy to adjust the strength characteristics of the reinforcing layer. As described above, the strength of the composite container with respect to the amount of fiber bundle to be used can be improved.

  In the method for manufacturing a composite container according to the present invention, the reinforcing layer forming step includes a second winding step in which the winding angle is constant at the first angle regardless of a change in the winding position of the fiber bundle in the axial direction. And a third winding step of making the winding angle constant at a second angle larger than the first angle regardless of a change in the winding position of the fiber bundle in the axial direction, the first winding step , Executed between the second winding step and the third winding step, and in the first winding step, from one side of either the first angle or the second angle as the fiber bundle is wound. The winding angle may be shifted to the other side. Here, conventionally, when shifting from the second winding step to the third winding step, or when shifting from the third winding step to the second winding step, the fiber bundle is switched in order to change the winding angle. Work was needed. However, the fiber bundle is supplied from a plurality of yarn supplying units, and the fiber bundle changing operation must be performed for each yarn supplying unit, so that the changing operation is very complicated. On the other hand, in the method for manufacturing a composite container according to the present invention, a difference occurs in the winding angle between the fiber layer formed by the second winding step and the fiber layer formed by the third winding step. However, the transition layer can be formed by changing the winding angle between them in the first winding step. Therefore, when shifting from the third winding step to the second winding step via the first winding step, the winding angle of the fiber bundle is determined when the first winding step is completed and the second winding step is started. It is already the first angle. Therefore, the second winding step can be performed without performing the fiber bundle changing operation. Alternatively, when shifting from the second winding step to the third winding step via the first winding step, the winding angle of the fiber bundle is determined when the first winding step is completed and the third winding step is started. It is already the second angle. Therefore, the third winding step can be executed without performing the fiber bundle changing operation. As described above, by performing the first winding step, the fiber bundle changing work can be omitted, and the cost can be reduced.

  In the method for manufacturing a composite container according to the present invention, the first winding step may be completed while the winding position reciprocates the liner once in the axial direction. This can improve the strength of the composite container relative to the amount of fiber bundle used.

  Moreover, in the manufacturing method of the composite container which concerns on this invention, the change rate of the winding angle with respect to the change of a winding position may be large, so that a winding angle is large in a 1st winding process. As a result, the reinforcing layer can be formed so as to generate a maximum point of strength at the central position in the axial direction of the liner. This can improve the strength of the composite container relative to the amount of fiber bundle used.

  The composite container according to the present invention is manufactured by the above-described method for manufacturing a composite container. According to this composite container, the strength with respect to the amount of fiber bundle to be used can be improved.

  According to the present invention, the strength of the composite container with respect to the amount of fiber bundle to be used can be improved.

It is a partial cross section figure which shows the composite container manufactured by the manufacturing method of the composite container which concerns on embodiment of this invention. It is the schematic which shows the structure of the manufacturing apparatus of a composite container. It is a schematic diagram for demonstrating a winding angle. It is a graph which shows an example of the relationship between the winding position of the fiber bundle in an axial direction, and a winding angle in a 1st winding process. It is a graph which shows an example of the relationship between the winding position of the fiber bundle in an axial direction, and a winding angle in a 1st winding process. It is a table | surface which shows the conditions of the winding angle of each fiber layer in an Example and a comparative example. It is a graph showing the relationship between the position of the liner in the axial direction and the intensity ratio. It is a graph which shows the design pressure per usage-amount of a fiber bundle in an Example and a comparative example. It is a graph which shows the result of the burst test in an Example and a comparative example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a partial cross-sectional view showing a composite container manufactured by a composite container manufacturing method according to an embodiment of the present invention. As shown in FIG. 1, the composite container 1 is a container for storing fuel gas such as hydrogen or natural gas at a high pressure. For example, the composite container 1 has a total length of 2 to 4 m and a diameter of about 400 to 600 mm, and can withstand a pressure of about 20 to 90 MPa when used. The use of the composite container 1 is not limited and can be used for various purposes. In addition, the composite container 1 may be used as a stationary type or may be used by being mounted on a moving body.

  The composite container 1 includes a cylindrical liner 2 and a reinforcing layer 3 provided so as to cover the outer surface side (outer peripheral surface side) of the liner 2. The liner 2 has a cylindrical barrel portion 2a extending in the axial direction, and a dome portion 2b formed on both ends of the barrel portion 2a. The diameter of the dome portion 2b is reduced toward the tip. A base 4 is attached to the tip of the dome portion 2b.

  The material of the liner 2 is not particularly limited, but resin or metal is selected depending on the application. Examples of the resin liner 2 include a thermoplastic resin such as high-density polyethylene formed in a container shape by rotational molding or blow molding and a metal base 4 attached thereto. As the metal liner 2, for example, a pipe shape or plate shape made of an aluminum alloy, steel, or the like is formed into a container shape by spinning or the like, and the shape of the base 4 is formed.

  The reinforcing layer 3 is formed by winding a fiber bundle 10 (see FIG. 2) impregnated with a thermosetting resin around the outer surface side of the liner 2 and heating and curing the fiber bundle 10 in a curing furnace. Types of thermosetting resins include phenolic resin, urea resin, unsaturated polyester resin, vinyl ester resin, polyimide resin, bismaleimide resin, polyimide resin, polyurethane resin, diallyl phthalate resin, epoxy resin, melamine resin or allyl resin However, it is not limited to these. In addition, as the fiber bundle 10 wound around the liner 2, a fiber bundle (toe prepreg) impregnated with a thermosetting resin in advance may be used. Alternatively, a method (resin bath method) in which a thermosetting resin is attached to the fiber bundle 10 in a stage before winding around the liner 2 may be used.

  Further, as the fiber bundle 10, for example, carbon fiber, glass fiber, aramid fiber, boron fiber, polyethylene fiber, steel fiber, Zylon fiber, or vinylon fiber can be used. Lightweight carbon fiber is used. In addition, the number of fibers (filament) of the fiber bundle 10 of the present embodiment is not particularly limited, but is in the range of 1000 to 50000 filaments, preferably 3000 to 30000 filaments, and here, 24,000 filaments. Yes.

  Next, with reference to FIG. 2, the manufacturing method of the composite container 1 is demonstrated. FIG. 2 is a schematic diagram showing the configuration of the manufacturing apparatus 100 for the composite container 1. The manufacturing apparatus 100 includes a support portion 101 that supports the liner 2 via a shaft 102, and a yarn feeding head 103 having a plurality of yarn feeding portions 104. The shaft 102 extends along the axial direction of the liner 2 and penetrates through the liner 2 via the caps 4 on both sides. Both end portions of the shaft 102 are supported by the support portions 101, respectively. A plurality of yarn feeding sections 104 are provided around the central axis CL of the liner 2 on the outer peripheral side of the liner 2. The plurality of yarn supplying sections 104 are arranged at a constant angle around the central axis line CL, and can supply the fiber bundle 10 to the liner 2 at the same time. The yarn feeding head 103 is formed in an annular shape so as to surround the liner 2 from the outer peripheral side, and supports a plurality of yarn feeding portions 104.

  The manufacturing apparatus 100 rotates the liner 2 relative to the plurality of yarn supplying units 104 around the central axis CL. In the present embodiment, the positions around the central axis CL of the plurality of yarn feeding portions 104 are fixed, and the support portion 101 rotates the liner 2 around the central axis CL via the shaft 102. Note that the manufacturing apparatus 100 may fix the position of the liner 2 around the central axis CL and rotate the plurality of yarn feeding sections 104 around the central axis CL. Alternatively, the manufacturing apparatus 100 may rotate both the liner 2 and the plurality of yarn feeding units 104 around the central axis CL. When rotating a plurality of yarn supplying units 104, for example, a mechanism for rotating each yarn supplying unit 104 may be provided on the yarn supplying head 103, and a mechanism for rotating the yarn supplying head 103 itself together with each yarn supplying unit 104 is provided. May be.

  Further, the manufacturing apparatus 100 moves the liner 2 relative to the plurality of yarn supplying units 104 in the axial direction. Here, the “axial direction” is a direction in which the central axis CL of the liner 2 extends in a state supported by the support portion 101 of the manufacturing apparatus 100. In the present embodiment, the position of the liner 2 in the axial direction is fixed, and the plurality of yarn supplying units 104 are moved in the axial direction. The plurality of yarn supplying units 104 can reciprocate in the axial direction with respect to the liner 2. A mechanism for moving the plurality of yarn supplying units 104 is not particularly limited. For example, a driving mechanism capable of reciprocating the yarn supplying head 103 along the axial direction may be provided. Note that the manufacturing apparatus 100 may fix the positions of the plurality of yarn supplying units 104 in the axial direction and move the liner 2 in the axial direction. Alternatively, the manufacturing apparatus 100 may move both the plurality of yarn feeding units 104 and the liner 2 in the axial direction. Note that when the liner 2 is moved in the axial direction, for example, a drive mechanism in which the support portion 101 itself moves in the axial direction together with the liner 2 and the shaft 102 may be provided. A drive mechanism that moves in the direction may be provided.

  A method for manufacturing the composite container 1 using the manufacturing apparatus 100 as described above will be described. When manufacturing the composite container 1, the liner 2 is prepared, and the liner 2 is supported by the shaft 102 and the support portion 101 of the manufacturing apparatus 100. In addition, the fiber bundle 10 from the yarn feeder 104 is fixed at a predetermined position of the liner 2 so that the fiber bundle 10 supplied from the plurality of yarn feeders 104 can be wound around the outer peripheral surface of the liner 2. . For example, the fiber bundle 10 may be fixed to the base 4 as shown in FIG. Next, while the plurality of yarn supplying units 104 supply the fiber bundle 10 to the liner 2, the liner 2 rotates relative to the plurality of yarn supplying units 104 around the central axis CL, and the liner 2 A reinforcing layer forming step is performed in which the fiber bundle 10 is wound around the liner 2 to form the reinforcing layer 3 by moving relative to the plurality of yarn supplying portions 104 in the axial direction. In addition, after winding the fiber bundle 10 around the liner 2, the reinforced layer 3 is completed by heating the wound fiber bundle 10 and hardening the thermosetting resin impregnated in the fiber bundle 10. The heating of the fiber bundle 10 may be performed by removing the liner 2 from the manufacturing apparatus 100 and moving it to a heating furnace after the winding of the fiber bundle 10 around the liner 2 is performed, and heating in the heating furnace. Alternatively, a predetermined heating means (for example, a configuration in which the heat of the heater is supplied from the outer peripheral side of the liner 2 or a heating medium such as hot air inside the liner 2 is wound around the liner 2 in the manufacturing apparatus 100. May be employed), and the thermosetting resin may be sequentially cured.

  In the reinforcing layer forming step, the winding position of the fiber bundle 10 supplied from the plurality of yarn supplying units 104 and wound around the liner 2 repeatedly reciprocates in the axial direction with respect to the liner 2. Thereby, the reinforcing layer 3 is constituted by a plurality of fiber bundle layers. When forming the predetermined fiber layer, the manufacturing apparatus 100 may wind the fiber bundle 10 by setting the winding angle θ different from that of the other fiber layers. Here, as shown in FIG. 3, the winding angle θ is a line passing through the contact point between the fiber bundle 10 and the liner surface when the fiber bundle 10 is wound, and a line parallel to the central axis CL. Is defined as an angle formed by the fiber bundle 10. The winding angle θ is set according to the relationship between the relative rotational speed of the liner 2 with respect to the plurality of yarn supplying portions 104 and the relative speed in the axial direction with respect to the plurality of yarn supplying portions 104 of the liner 2.

  Next, a method for setting the winding angle θ of the fiber bundle 10 in the reinforcing layer forming step will be described. However, in the following description, it is assumed that the winding angle θ when the fiber bundle 10 is wound around the body portion 2a of the liner 2 is referred to. You may set arbitrarily about the winding angle of the dome part 2b. In the present embodiment, the reinforcing layer forming step includes a first winding step in which the winding angle θ of the fiber bundle 10 with respect to the liner 2 is changed according to a change in the winding position of the fiber bundle 10 in the axial direction, and the fiber bundle 10 in the axial direction. The second winding step in which the winding angle θ is constant at the first angle α1 (see FIG. 3A) and the change in the winding position of the fiber bundle 10 in the axial direction, regardless of the change in the winding position of Regardless, it includes a third winding step in which the winding angle θ is constant at a second angle α2 (see FIG. 3B) that is larger than the first angle α1. In the reinforcing layer forming step, the order and the number of times of the first to third winding steps are appropriately set.

  In the second winding step, helical winding is performed on the liner 2 along the axial direction in a state where the winding angle θ is kept constant at the first angle α1, which is a small angle. By performing helical winding at a small first angle α1, the strength in the axial direction of the composite container 1 can be ensured mainly. Although 1st angle (alpha) 1 is not specifically limited, You may set to 10-50 degrees. For the sake of explanation, the fiber layer formed with the winding angle θ kept constant at the first angle α1 may be referred to as “first fiber layer”. In the third winding step, helical winding is performed on the liner 2 along the axial direction in a state where the winding angle θ is kept constant at the second angle α2, which is a large angle. By performing helical winding at the large second angle α2, it is possible to ensure mainly the strength of the composite container 1 in the hoop direction. The second angle α2 is not particularly limited, but may be set to 40 to 85 °. For the sake of explanation, the fiber layer formed with the winding angle θ kept constant at the second angle α2 may be referred to as a “second fiber layer”.

  In the present embodiment, the first winding step is a step executed between the second winding step and the third winding step, and the first angle α1 as the winding of the fiber bundle 10 progresses. And the second angle α2 is a step executed to change the winding angle θ from one side to the other side. For the sake of explanation, the fiber layer formed in the first winding step that changes the winding angle θ depending on the position in the axial direction is referred to as a “transition layer”.

  When shifting from the second winding step to the third winding step through the first winding step, for example, as shown in FIGS. 4A and 5A, in the first winding step, the shaft In at least a part of the liner 2 in the direction, the winding angle θ increases as the winding of the fiber bundle 10 progresses. However, the winding angle θ may be constant in a part of the liner 2 in the axial direction. Alternatively, the winding angle θ may increase with the progress of winding of the fiber bundle 10 over the entire area of the body portion 2a of the liner 2. In this case, there is no portion (as shown in FIGS. 4 (a) and 5 (a)) in the trunk portion 2a of the liner 2 where the winding angle θ decreases as the winding of the fiber bundle 10 progresses. Is preferred, but may be reduced in part. The winding angle θ at the start of winding in the first winding step (hereinafter referred to as “start angle”) may be the same angle as the first angle α1, or may be a different angle. The winding angle θ at the end of winding in the first winding step (hereinafter referred to as “end angle”) may be the same angle as the second angle α2, or may be a different angle.

  When shifting from the third winding step to the second winding step through the first winding step, for example, as shown in FIGS. 4B and 5B, in the first winding step, the shaft In at least a part of the liner 2 in the direction, the winding angle θ decreases as the winding of the fiber bundle 10 progresses. However, the winding angle θ may be constant in a part of the liner 2 in the axial direction. Alternatively, the winding angle θ may decrease with the progress of winding of the fiber bundle 10 over the entire area of the body portion 2a of the liner 2. In this case, there is no portion (as shown in FIGS. 4A and 5A) where the winding angle θ increases with the progress of winding of the fiber bundle 10 in the body 2a of the liner 2. Is preferred, but may be increased in part. In addition, although the same angle as 2nd angle (alpha) 2 may be sufficient as the start angle in a 1st winding process, a different angle may be sufficient as it. The end angle in the first winding step may be the same angle as the first angle α1, but may be a different angle.

  As shown in FIG. 4, the first winding step may be completed while the winding position reciprocates the liner 2 once in the axial direction. In the example shown in FIG. 4, the first winding process is started from one end EA (see FIG. 2) in the body 2 a of the liner 2, and the traveling direction of the winding position is reversed at the other end EB. When the winding position reaches one end EA, the first winding process ends. Note that the dome 2b is wound around the ends EA and EB. Alternatively, the first winding step may be completed while the winding position reciprocates the liner 2 twice or more in the axial direction. In the example shown in FIG. 5, the first winding step is completed by the winding position reciprocating the liner 2 twice.

  In the first winding step, the change rate of the winding angle θ with respect to the change of the winding position is larger as the winding angle θ is larger. That is, in the first winding step, the smaller the winding angle θ, the smaller the change rate of the winding angle θ with respect to the change in the winding position. In this case, as shown in FIG. 4 and FIG. 5, the graph when the winding position in the axial direction is set on the horizontal axis and the winding angle θ is set on the vertical axis is a curved curve that is convex downward. The larger the rate of change, the larger the curve, and the smaller the rate of change, the smaller the curve. For example, as shown in FIGS. 4A and 5A, when the first winding process is performed so that the winding angle θ is increased, the winding angle θ is increased immediately after the start of the angle increase after the start of winding. The rate of change is small, and the rate of change of the winding angle θ gradually increases as the winding progresses. Further, as shown in FIGS. 4B and 5B, when the first winding process is performed so that the winding angle θ is decreased, the winding angle θ is set immediately after the start of the angle reduction after the start of the winding. The rate of change is large, and as the winding progresses, the rate of change of the winding angle θ gradually decreases. However, there may be a portion that does not satisfy the above relationship temporarily, such as when the rate of change is temporarily reduced near the reversal position of the reciprocation.

  Next, the operation and effect of the method for manufacturing the composite container 1 according to the embodiment of the present invention will be described.

  In the method for manufacturing the composite container 1 according to this embodiment, the reinforcing layer forming step of forming the reinforcing layer 3 by winding the fiber bundle 10 around the liner 2 is performed on the liner 2 according to the change in the winding position of the fiber bundle 10 in the axial direction. A first winding step of changing the winding angle θ of the fiber bundle 10 is included. As described above, the condition of the winding angle θ can be easily adjusted according to the change in the winding position of the fiber bundle 10 in the axial direction, so that the strength characteristics of the reinforcing layer can be easily adjusted. As described above, the strength of the composite container with respect to the amount of the fiber bundle 10 to be used can be improved. For example, by adopting the method for manufacturing the composite container 1 according to this embodiment, the waste of the wound fiber bundle 10 (that is, the fiber bundle that contributes less to securing the strength) is suppressed, and the strength expression rate of the composite container 1 is reduced. In addition, the use efficiency of the fiber bundle 10 can be improved.

  According to the method for manufacturing the composite container 1 according to the present embodiment, since the first winding step of changing the winding angle θ according to the change in the winding position of the fiber bundle 10 in the axial direction is provided (for example, winding) It becomes easier to adjust the condition of the winding angle θ (as compared to a manufacturing method having only a winding step in which winding is performed with the angle θ kept constant). Therefore, by adopting the method for manufacturing the composite container 1 according to the present embodiment, it is easy to adjust the strength characteristics of the composite container 1 as follows by adjusting the change of the winding angle θ. . For example, in the first winding step, the condition of the winding angle θ is set so that the strength distribution of the reinforcing layer 3 of the composite container 1 is substantially symmetrical with respect to the center position in the axial direction of the liner 2. Is preferred. In the first winding step, the condition of the winding angle θ is set so that the strength in the hoop direction (circumferential direction) in the portion of the composite container 1 corresponding to the body 2a of the liner 2 varies depending on the position in the axial direction. Is preferably set. Further, in the first winding step, a maximum point is generated in the strength in the hoop direction at the central portion in the axial direction of the body portion 2a of the liner 2 in the composite container 1 (see, for example, FIG. 7B). ), The condition of the winding angle θ is preferably set.

  In the method for manufacturing the composite container 1 according to the present embodiment, the reinforcing layer forming step is a first step in which the winding angle θ is constant at the first angle α1 regardless of the change in the winding position of the fiber bundle 10 in the axial direction. And a third winding step in which the winding angle θ is constant at a second angle α2 larger than the first angle α1 regardless of the change in the winding position of the fiber bundle 10 in the axial direction. In addition. In addition, the first winding process is executed between the second winding process and the third winding process. In the first winding step, the winding angle θ may be changed from one of the first angle α1 and the second angle α2 to the other side as the fiber bundle 10 is wound. Here, conventionally, when shifting from the second winding step to the third winding step, or when shifting from the third winding step to the second winding step, the fiber bundle 10 is changed in order to change the winding angle. A crossover work was necessary. However, since the fiber bundle 10 is supplied from the plurality of yarn supplying sections 104, the fiber bundle 10 must be replaced for each of the yarn supplying sections 104, so that the changing operation is very complicated. It was. On the other hand, in the manufacturing method of the composite container 1 which concerns on this embodiment, it is between the 1st fiber layer formed by the 2nd winding process, and the 2nd fiber layer formed by the 3rd winding process. Then, although a difference arises in a winding angle, a transition layer can be formed by changing a winding angle in the 1st winding process between them. Therefore, when shifting from the third winding step to the second winding step via the first winding step, the winding angle of the fiber bundle 10 when the first winding step is completed and the second winding step is started. θ has already become the first angle α1. Therefore, the second winding step can be executed without performing the changing operation of the fiber bundle 10. Alternatively, when shifting from the second winding step to the third winding step via the first winding step, the winding angle of the fiber bundle 10 is reached when the first winding step is completed and the third winding step is started. θ is already the second angle α2. Therefore, the third winding step can be executed without performing the changing operation of the fiber bundle 10. As described above, by performing the first winding step, the work of changing the fiber bundle 10 can be omitted, and the cost can be reduced.

  In the method for manufacturing the composite container 1 according to this embodiment, the first winding step may be completed while the winding position reciprocates the liner 2 once in the axial direction. Thereby, since the waste of the fiber bundle 10 can be reduced by reducing the number of reciprocations, the strength of the composite container 1 with respect to the amount of the fiber bundle 10 to be used can be improved.

Moreover, in the manufacturing method of the composite container 1 which concerns on this embodiment, in the 1st winding process, the change rate of winding angle (theta) with respect to the change of winding position may be so large that winding angle (theta) is large. When the winding angle is θ, the circumferential strength and the axial strength of the composite container 1 are coefficients of sin θ ² and cos θ ² , respectively. Therefore, the reinforcing layer 3 can be formed so as to generate a maximum point of strength at the central position in the axial direction of the liner 2 by appropriately changing the rate of change in the axial position of the winding angle θ as described above. it can. When the reinforcing layer 3 is formed so as to generate a maximum point of intensity at the center position of the liner 2, the intensity distribution graph is W-shaped as shown by a two-dot chain line in FIG. 7B, for example. For example, if the rate of change of the winding angle θ is constant, the strength near the both ends of the body portion 2a of the composite container 1 may be maximized, and the difference in strength from the central portion of the composite container 1 may increase. On the other hand, in the W-shaped intensity distribution, the strength of the central portion of the composite container 1 is maximized (or has a maximum point), and therefore, between the maximum value and the minimum value in the axial direction of the liner 2. Can be reduced (for example, as compared with the intensity distribution shown by the thin solid line and the broken line in FIG. 7A), it is possible to suppress the occurrence of breakage in the weak part. Thereby, the intensity | strength of the composite container with respect to the quantity of the fiber bundle 10 to be used can be improved.

  The composite container 1 according to the present invention is manufactured by the above-described method for manufacturing the composite container 1. According to this composite container 1, the strength with respect to the amount of the fiber bundle 10 to be used can be improved.

  The present invention is not limited to the embodiment described above.

  For example, in the above-described embodiment, the first winding step is executed between the second winding step and the third winding step, and in the first winding step, the first angle α1 and the second angle are performed. This is a step of forming a transition layer that changes the winding angle θ from one side of α2 to the other side. However, the first winding process may not be performed between the second winding process and the third winding process. Moreover, in the reinforcement | strengthening layer formation process, it is sufficient to have at least the first winding process, and one or both of the second winding process and the third winding process may be omitted. Moreover, the 1st winding process should just change the winding angle (theta) of the fiber bundle 10 with respect to the liner 2 according to the change of the winding position of the fiber bundle 10 in an axial direction, and was illustrated by the above-mentioned embodiment. (For example, FIG. 4 and FIG. 5) It is not limited to the aspect of change. Note that the reinforcing layer forming step may include a winding step other than the first to second winding steps. That is, a step of forming the fiber layer with the winding angle θ kept constant at an angle other than the first angle α1 and the second angle α2 may be added.

  Examples will be described below. However, the present invention is not limited to these examples.

[Example 1]
In order to manufacture the composite container according to Example 1, a 7.5 L aluminum alloy liner having an overall length of 504 mm, an overall length of the trunk portion of 343 mm, an outer diameter of the trunk portion of 160 mm, and a wall thickness of 2 mm was prepared. As a fiber bundle, 24,000 filaments of carbon fiber T800SC (manufactured by Toray Industries, Inc.) were impregnated with resin, and a tow prepreg having a resin content of 29% was used. As the manufacturing apparatus, one having 48 yarn supplying portions at a constant angle in the circumferential direction (that is, 48 yarn supplying units) was used. Moreover, it was set as the speed | rate of 30 to 60 second by one round of lamination | stacking, and the tension | tensile_strength was 30N.

  Further, the condition of the winding angle θ in each fiber layer was set to the condition shown in “Example 1” in FIG. 6. Here, the fiber layer formed by making the winding angle θ constant at the first angle α1 (= 14.5 °) and reciprocating the winding position between one end and the other end of the liner is “first”. 1 fiber layer ". The fiber layer formed by making the winding angle θ constant at the second angle α2 (= 73.6 °) and reciprocating the winding position between one end and the other end of the liner is referred to as “second fiber”. Referred to as a layer. A fiber layer formed by changing the winding angle θ from the first fiber layer toward the second fiber layer is referred to as “transition layer A”. A fiber layer formed by changing the winding angle θ from the second fiber layer toward the first fiber layer is referred to as “transition layer B”.

  In Example 1, as the control program for the winding angle θ for forming the transition layer A, the program shown in FIG. In the control program shown in FIG. 5A, the winding angle θ at the transition start position (one end EA of the body part) is set to 14.5 °, similarly to the first angle α1, and the transition end position is set. The winding angle θ at (the end EA after two reciprocations) is set to 73.6 ° like the second angle α2. In the control program shown in FIG. 5A, in the first round trip with a small winding angle θ, the winding angle θ gradually increases at a small change rate, and in the second round trip, the section from the end EA to the end EB is reached. Thus, the winding angle α increases with a large change rate. In the section from the end EB to the end EA in the second round-trip, the end angle reaches 73.6 ° immediately after turning in the traveling direction. Further, as the control program for the winding angle θ for forming the transition layer B, the program shown in FIG. In the control program shown in FIG. 5 (b), the winding angle θ at the transition start position (one end EA of the body part) is set to 73.6 ° like the second angle α2, and the transition end position is set. The winding angle θ at (the end portion EA after two reciprocations) is set to 14.5 ° similarly to the first angle α1. In the control program shown in FIG. 5 (b), in the first round trip with a large winding angle θ, the winding angle θ decreases at a large change rate after a constant angle immediately after the start, and from the end EA in the second round trip. In the section toward the end EB, the winding angle α gradually decreases at a small change rate.

  In Example 1, as shown by “Example 1” in FIG. 6, the first and second layers are the first fiber layer, the third layer is the second fiber layer, the fourth layer is the transition layer B, and the fifth layer. The eyes were the first fiber layer, the sixth layer was the transition layer A, the seventh layer was the second fiber layer, and the eighth and ninth layers were the first fiber layer. After forming a fiber layer on the said conditions, it heated with the curing furnace, the thermosetting resin was hardened, and the reinforcement layer was completed. At this time, the design pressure was 141.2 MPa.

[Example 2]
The condition of the winding angle θ in each fiber layer is set to the condition shown in “Example 2” in FIG. 6, and the control program for the winding angle θ for forming the transition layer A is shown in FIG. The same conditions as in Example 1 were adopted except that the control program for the winding angle θ for forming the transition layer B was the one shown in FIG.

  In the control program shown in FIG. 4A, the winding angle θ at the transition start position (one end EA of the body part) is set to 14.5 °, similarly to the first angle α1, and the transition end position is set. The winding angle θ at (the end EA after one reciprocation) is set to 73.6 °, similarly to the second angle α2. In the control program shown in FIG. 4A, the winding angle θ gradually increases at a small change rate in the section from the end EA to the end EB, and changes greatly in the section from the end EB to the end EA. The rate winding angle θ increases. In the section from the end portion EB to the end portion EA, after reaching the end angle of 73.6 ° after turning in the traveling direction, winding is performed at a constant angle. In the control program shown in FIG. 4B, the wrapping angle θ at the transition start position (one end EA of the body part) is set to 73.6 ° as with the second angle α2, and the transition end position is set. The winding angle θ at (the end EA after one reciprocation) is set to 20 °, which is an angle larger than the first angle α1. This can prevent the fiber bundle from slipping in the vicinity of the fiber end position. Moreover, since there is no big difference between 1st angle (alpha) 1, it can transfer to formation of a 1st fiber layer, without producing a problem. In the control program shown in FIG. 4 (b), in a section from the end EA having a large winding angle θ to the end EB, the winding angle θ decreases at a large change rate after the angle is set to a constant angle immediately after the start. In the section from EB to the end EA, the winding angle α gradually decreases with a small change rate.

[Comparative Example 1]
The configuration of the fiber layer was the same as in Example 1 except that the conditions shown in “Comparative Example 1” in FIG. 6 were set. In Example 1, as shown by “Comparative Example 1” in FIG. 6, the first and second layers are the first fiber layer, the third layer is the second fiber layer, the fourth layer is the first fiber layer, The fifth layer was the second fiber layer, and the sixth and seventh layers were the first fiber layer. In Comparative Example 1, the design pressure was 112.2 MPa.

[Comparative Example 2]
Unlike Example 1, the fiber bundle was wound by a single yarn for winding one fiber bundle. Further, as the structure of the fiber layer, the conditions shown in “Comparative Example 2” in FIG. 6 were adopted. The first layer is a fiber layer by hoop winding (winding angle θ is approximately 90 °), the second layer is a fiber layer having a winding angle θ of 15.3 °, and the third layer is a winding angle θ of 18.1 °. The fiber layer, the fourth layer is a fiber layer having a winding angle θ of 15.3 °, the fifth layer is a fiber layer having a winding angle θ of 83.6 °, and the sixth layer is a winding angle θ of 15.3 °. The seventh layer is a fiber layer with a winding angle θ of 18.1 °, the eighth layer is a fiber layer with a winding angle θ of 14.8 °, and the ninth layer is a fiber layer by hoop winding. It was. In Comparative Example 1, the design pressure was 102.7 MPa.

[Test results]
A graph showing the relationship between the position of the liner in the axial direction and the intensity ratio is shown in FIG. The vertical axis represents the strength ratio of the reinforcing layer of the composite container to the design pressure of the composite container. As shown in FIG. 7 (a), in Example 1 and Comparative Example 1, the intensity ratio in the hoop direction on both ends in the axial direction was larger than that in the vicinity of the center. On the other hand, as shown in FIG. 7 (b), in Example 2, the strength in the hoop direction at both ends in the axial direction increases, and the strength decreases from both ends toward the center, near the center of the liner. A maximum point occurred in the strength in the hoop direction. Thus, according to Example 2, it is understood that the strength in the hoop direction near the center of the liner can be increased.

  Next, the design pressure per use amount of the fiber bundle in Examples and Comparative Examples is shown in FIG. As shown in FIG. 8, in Example 2, the design pressure per use amount of the fiber bundle was high, which was about the same as that of Comparative Example 2 manufactured by winding with a single yarn. Further, in Example 1, the design pressure per use amount of the fiber bundle was higher than that of Comparative Example 1 having at least no fiber layer.

  Next, the result of the burst test in an Example and a comparative example is shown in FIG. In the burst test, the breaking pressure was measured by water pressure. Fig.9 (a) shows the intensity | strength expression rate in each Example and a comparative example. The strength expression rate is obtained by “burst pressure / design pressure”. As shown to Fig.9 (a), the intensity | strength expression rate of Example 2 became the highest. Moreover, FIG.9 (b) shows the use efficiency in each Example and a comparative example. The use efficiency is determined by “burst pressure / fiber bundle use amount”. As shown in FIG. 9B, the use efficiency of Example 2 was the highest. Moreover, the use efficiency of Example 1 was higher than at least Comparative Example 1.

DESCRIPTION OF SYMBOLS 1 ... Composite container, 2 ... Liner, 3 ... Reinforcement layer, 4 ... Base, 10 ... Fiber bundle, 100 ... Manufacturing system.

Claims (5)

To a liner having a cylindrical body and a dome formed on both ends of the body, a fiber bundle is supplied and wound from a plurality of yarn supplying sections provided around the central axis of the liner, and the liner A method of manufacturing a composite container that forms a reinforcing layer on the outer peripheral side,
While the plurality of yarn supplying sections supply the fiber bundle to the liner, the liner relatively rotates around the central axis with respect to the plurality of yarn supplying sections, and the liner is the plurality of the plurality of yarn supplying sections. A reinforcing layer forming step of moving relative to the yarn feeding portion in the axial direction and winding the fiber bundle around the liner to form the reinforcing layer;
Said reinforcing layer forming step, in accordance with the change in winding position of the fiber bundle in the axial direction, seen including a first winding step for changing the winding angle of the fiber bundle with respect to the body portion of said liner,
In the first winding step, a composite container for controlling the winding of the fiber bundle around the liner based on a control program set so that the winding angle changes to a desired value according to the change in the winding position . Production method. The reinforcing layer is composed of a plurality of fiber layers,
The reinforcing layer forming step includes
A second winding step of forming the first fiber layer with the winding angle being constant at the first angle regardless of a change in the winding position of the fiber bundle in the axial direction;
Regardless of a change in the winding position of the fiber bundle in the axial direction, the winding angle is constant at a second angle larger than the first angle, and the fiber layer is different from the first fiber layer. A third winding step for forming two fiber layers ,
The first winding step is executed between the second winding step and the third winding step,
In the first winding step, as the winding of the fiber bundle progresses, the winding angle is shifted from one side of the first angle and the second angle to the other side, thereby the first winding step . The fiber layer and the second fiber layer are different fiber layers, and form a transition layer disposed between the first fiber layer and the second fiber layer . A method for manufacturing a composite container.   3. The method for manufacturing a composite container according to claim 1, wherein the first winding step is completed while the winding position is reciprocated once in the axial direction of the liner.   The manufacturing method of the composite container according to any one of claims 1 to 3, wherein, in the first winding step, the rate of change of the winding angle with respect to the change of the winding position increases as the winding angle increases. To a liner having a cylindrical body and a dome formed on both ends of the body, a fiber bundle is supplied and wound from a plurality of yarn supplying sections provided around the central axis of the liner, and the liner A method of manufacturing a composite container that forms a reinforcing layer on the outer peripheral side,
While the plurality of yarn supplying sections supply the fiber bundle to the liner, the liner relatively rotates around the central axis with respect to the plurality of yarn supplying sections, and the liner is the plurality of the plurality of yarn supplying sections. A reinforcing layer forming step of moving relative to the yarn feeding portion in the axial direction and winding the fiber bundle around the liner to form the reinforcing layer;
Said reinforcing layer forming step, in accordance with the change in winding position of the fiber bundle in the axial direction, seen including a first winding step for changing the winding angle of the fiber bundle with respect to said liner,
The reinforcing layer is composed of a plurality of fiber layers,
The reinforcing layer forming step includes
A second winding step of forming the first fiber layer with the winding angle being constant at the first angle regardless of a change in the winding position of the fiber bundle in the axial direction;
Regardless of a change in the winding position of the fiber bundle in the axial direction, the winding angle is constant at a second angle larger than the first angle, and the fiber layer is different from the first fiber layer. A third winding step for forming two fiber layers ,
The first winding step is executed between the second winding step and the third winding step,
In the first winding step, as the winding of the fiber bundle progresses, the winding angle is shifted from one side of the first angle and the second angle to the other side, thereby the first winding step . A method of manufacturing a composite container, wherein a transition layer disposed between the first fiber layer and the second fiber layer, which is a fiber layer different from the fiber layer and the second fiber layer, is formed .

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