阅读说明：本技术 高压罐的制造方法 (Method for manufacturing high-pressure tank ) 是由 八田健 于 2020-01-10 设计创作，主要内容包括：本发明提供一种能够相对于衬里卷绕强化纤维束而不会降低罐性能的高压罐的制造方法。在相对于旋转的衬里(11)卷绕含浸有树脂的带状的强化纤维束(F1),从而在衬里的外表面形成纤维强化树脂层(12)的高压罐(10)的制造方法中,构成为与相对于衬里卷绕带状的强化纤维束的动作并行地,以与带状的强化纤维束交叉的方式相对于衬里卷绕宽度比带状的强化纤维束窄的窄幅强化纤维束(F2)。(The invention provides a method for manufacturing a high-pressure tank, which can wind a reinforcing fiber bundle relative to a lining without reducing the performance of the tank. In a method for manufacturing a high-pressure tank (10) in which a resin-impregnated band-shaped reinforcing fiber bundle (F1) is wound around a rotating liner (11) to form a fiber-reinforced resin layer (12) on the outer surface of the liner, a narrow-width reinforcing fiber bundle (F2) is wound around the liner so that the width of the narrow-width reinforcing fiber bundle is narrower than that of the band-shaped reinforcing fiber bundle, so as to intersect with the band-shaped reinforcing fiber bundle, in parallel with the operation of winding the band-shaped reinforcing fiber bundle around the liner.)

1. A method for manufacturing a high-pressure tank, wherein a fiber-reinforced resin layer is formed on the outer surface of a rotating liner by winding a band-shaped reinforcing fiber bundle impregnated with a resin around the liner,

the method of manufacturing a high-pressure tank is characterized in that,

in parallel with the operation of winding the reinforcing fiber bundle around the liner, a fiber material having a width smaller than that of the reinforcing fiber bundle is wound around the liner so as to intersect the reinforcing fiber bundle.

2. The method of manufacturing a high-pressure tank according to claim 1,

the fibrous material is wound around the liner while the fibrous material is heated.

3. The method of manufacturing a high-pressure tank according to claim 1 or 2,

the fiber material is a narrow-width reinforcing fiber bundle which is narrower than the reinforcing fiber bundle and is impregnated with resin.

4. The method of manufacturing a high-pressure tank according to claim 1 or 2,

the fibrous material has compatibility with the liner.

5. The method for manufacturing a high-pressure tank according to any one of claims 1 to 4,

the reinforcing fiber bundle and the fiber material are wound around the liner from opposite directions with the liner interposed therebetween.

6. The method for manufacturing a high-pressure tank according to any one of claims 1 to 5,

the fiber material is wound around the liner by spiral winding so as to intersect the reinforcing fiber bundle, in parallel with the operation of winding the reinforcing fiber bundle around the liner by annular winding.

7. The method for manufacturing a high-pressure tank according to any one of claims 1 to 6,

the fiber material is wound around the liner by annular winding so as to intersect the reinforcing fiber bundle, in parallel with the operation of winding the reinforcing fiber bundle around the liner by spiral winding.

8. The method for manufacturing a high-pressure tank according to any one of claims 1 to 7,

the fiber material is wound around the liner at a crossing angle of 60 degrees or more and 90 degrees or less with respect to the reinforcing fiber bundle wound around the liner.

Technical Field

The present invention relates to a method for manufacturing a high-pressure tank.

Background

As a high-pressure tank, a high-pressure tank is known in which a liner for filling a high-pressure fluid such as a gas is reinforced from the outside by reinforcing fibers. In the method of manufacturing a high-pressure tank, a band-shaped reinforcing fiber bundle impregnated with a resin is wound around the outer surface of a liner by a so-called filament winding method (hereinafter, referred to as FW method). In the FW method, the reinforcing fiber bundle is wound around the rotating liner to form the annular layer, but there is a problem that the reinforcing fiber bundle slips at the end position of the annular layer. Therefore, a method has been proposed in which the number of windings of the reinforcing fiber bundle at the end position of the annular layer is increased to suppress slippage of the reinforcing fiber bundle (see, for example, patent document 1).

Patent document 1: japanese patent laid-open No. 2014-133304

However, in the method for manufacturing a high-pressure tank described in patent document 1, there is a concern that: the strength of the reinforcing fiber bundle varies between a portion where the reinforcing fiber bundle is wound more and a portion where the reinforcing fiber bundle is wound less. The occurrence of slippage of the reinforcing fiber bundles is not limited to the case where the liner forms an annular layer. Further, when the reinforcing fiber bundle is wound around the liner, in addition to the slippage of the reinforcing fiber bundle, incomplete surface contact in which the side ends of the reinforcing fiber bundle partially contact the liner, and the like, also become factors that degrade the tank performance such as strength and durability. Although it is also considered to increase the winding tension of the reinforcing fiber bundle, this has the following problems: when the resin bleeds out from the reinforcing fiber bundle, Vf (fiber volume content) increases, and in addition to the reduction in the tank performance, abrasion, breakage, and slippage of the reinforcing fiber bundle are likely to occur.

Disclosure of Invention

The present invention aims to provide a method for manufacturing a high-pressure tank, which can manufacture a high-pressure tank having improved strength, durability, and the like, and having stable quality.

In order to solve the above problems, a method of manufacturing a high-pressure tank according to the present invention is a method of manufacturing a high-pressure tank in which a fiber-reinforced resin layer is formed on an outer surface of a liner by winding a band-shaped reinforcing fiber bundle impregnated with a resin around the rotating liner, wherein a fiber material having a width smaller than that of the reinforcing fiber bundle is wound around the liner so as to intersect with the reinforcing fiber bundle in parallel with a winding operation of the reinforcing fiber bundle around the liner.

According to this structure, the reinforcing fiber bundle is wound around the liner, and the fiber material is wound around the liner so as to hold the reinforcing fiber bundle. The side ends of the band-shaped reinforcing fiber bundles can be prevented from not completely contacting the outer surface of the liner (edgeloading), and the reinforcing fiber bundles can be prevented from shifting relative to the outer surface of the liner. Further, since the fiber material is formed to be narrow, even if the reinforcing fiber bundle and the fiber material are wound around the liner, the wound state of the reinforcing fiber bundle around the liner does not deteriorate. Therefore, a high-pressure tank having improved strength, durability, and the like and stable quality can be manufactured.

The fiber material is not particularly limited as long as it can be wound so as to intersect the reinforcing fiber bundles with the liner, but in a more preferable embodiment, the fiber material is wound with the liner while being heated. According to this structure, the fiber material can be provided with adhesiveness, and the reinforcing fiber bundle can be strongly held by the fiber material.

The fiber material is not particularly limited as long as it is narrower than the reinforcing fiber bundles in width, but in a more preferable embodiment, the fiber material is a narrow reinforcing fiber bundle which is narrower in width than the reinforcing fiber bundles and impregnated with resin. According to this configuration, the strength of the liner can be improved not only by holding the reinforcing fiber bundles with the narrow reinforcing fiber bundles, but also by holding the reinforcing fiber bundles with the narrow reinforcing fiber bundles. Therefore, the amount of winding of the reinforcing fiber bundle with respect to the liner can be reduced, and the winding time of the reinforcing fiber bundle can be shortened.

The fiber material is not particularly limited as long as it is narrower than the reinforcing fiber bundles, but in a more preferable embodiment, the fiber material has compatibility with the liner. According to this configuration, the reinforcing fiber bundles can be strongly pressed against the liner by the fiber material having compatibility with the liner.

In a more preferred aspect, the reinforcing fiber bundles and the fiber material are wound around the liner from opposite directions with the liner interposed therebetween. According to this structure, the reinforcement fiber bundle and the fiber material are prevented from being entangled with each other when the reinforcement fiber bundle and the fiber material are wound around the liner.

The fiber material is not particularly limited as long as it can be wound around the liner in parallel with the operation of winding the reinforcing fiber bundle around the liner, but in a more preferable embodiment, the fiber material is wound around the liner by spiral winding so as to intersect with the reinforcing fiber bundle, in parallel with the operation of winding the reinforcing fiber bundle around the liner by annular winding. According to this structure, the annular layer having a high reinforcing effect with respect to the liner can be formed.

The fiber material is not particularly limited as long as it can be wound around the liner in parallel with the operation of winding the reinforcing fiber bundle around the liner, but in a more preferable embodiment, the fiber material is wound around the liner in a ring-like winding so as to intersect with the reinforcing fiber bundle, in parallel with the operation of winding the reinforcing fiber bundle around the liner by spiral winding. According to this structure, a spiral layer having a high reinforcing effect with respect to the liner can be formed.

The fiber material is not particularly limited as long as it can cross the reinforcing fiber bundles and be wound around the liner at a narrower width than the reinforcing fiber bundles, but in a more preferable aspect, the fiber material is wound around the liner at a crossing angle of 60 degrees or more and 90 degrees or less with respect to the reinforcing fiber bundles wound around the liner. According to this configuration, the crossing angle between the reinforcing fiber bundle and the fiber material is made approximately orthogonal, whereby the fiber material can effectively suppress the slippage of the reinforcing fiber bundle.

According to the present invention, the reinforcing fiber bundle is wound around the liner, and the fiber material is wound around the liner so as to hold the reinforcing fiber bundle. Therefore, a high-pressure tank having improved strength, durability, and the like and stable quality can be manufactured.

Drawings

Fig. 1 is a schematic cross-sectional view of a high-pressure tank according to the present embodiment.

Fig. 2 is a schematic configuration diagram of a winding device for reinforcing fiber bundles according to the present embodiment.

Fig. 3 is a diagram showing an example of the step of forming the annular layer according to the present embodiment.

Fig. 4 is a diagram showing an example of the spiral layer forming step according to the present embodiment.

Description of reference numerals

10.. high-pressure tank, 11.. liner, L1.1.. annular layer, L2.. spiral layer, F1.. ribbon-shaped reinforcing fiber bundle, and F2... narrow reinforcing fiber bundle.

Detailed Description

The present embodiment will be described below. Fig. 1 is a schematic cross-sectional view of a high-pressure tank according to the present embodiment. In the following description, a fuel tank for storing fuel gas such as hydrogen in a fuel cell in a vehicle-mounted fuel cell system is described as an example of the high-pressure tank, but the high-pressure tank may be used for any application other than the fuel cell system.

As shown in fig. 1, the high-pressure tank 10 includes a tank main body 13 formed by coating an outer surface of a liner 11, which is a base material of the tank, with a fiber-reinforced resin layer 12. The tank main body 13 has an outer surface shape in which a pair of dome portions 15 and 16 are projected in a hemispherical shape from both ends of a cylindrical main body portion 14. A pair of joints 21 and 26 are provided at the apexes of the dome portions 15 and 16. A through hole 24 is formed in one of the joints 21, and the gas in the tank main body 13 is released and flowed in by a valve (not shown) attached to the through hole 24. The other joint 26 has no through hole, and the tank body 13 is sealed by the joint 26.

The liner 11 serves as a base material of the high-pressure tank 10 and is formed in a hollow shape so as to have a fuel gas storage space 19, the liner 11 is formed of a resin having gas barrier properties against the fuel gas, examples of the resin material of the liner 11 include resins such as polyamide, ethylene-vinyl alcohol copolymer, and polyethylene, and examples of the fuel gas of the liner 11 include hydrogen gas, various compressed gases such as CNG (compressed natural gas), various liquefied gases such as L NG (liquefied natural gas) and L PG (liquefied petroleum gas), and various other pressurized substances.

The fiber-reinforced resin layer 12 is formed by winding a band-shaped reinforcing fiber bundle impregnated with uncured resin (uncured thermosetting resin) and a narrow fiber material around the liner 11 and curing the uncured resin by heating, and the fiber-reinforced resin layer 12 is formed by the annular layer L1 covering the cylindrical portion 17 of the liner 11 and the spiral layer L2 entirely covering the liner 11, which will be described in detail later, but in the present embodiment, the fiber material is spirally wound around the liner 11 in parallel with the operation of spirally winding the reinforcing fiber bundle around the liner 11 to form the annular layer L1, and the fiber material is circularly wound around the liner 11 in parallel with the operation of spirally winding the reinforcing fiber bundle around the liner 11 to form the spiral layer L2.

The hoop winding is a winding method in which the reinforcing fiber bundle or the fiber material is wound around the liner 11 at a winding angle substantially perpendicular to the central axis CX of the liner 11. The helical winding is a winding method in which a reinforcing fiber bundle or a fiber material is wound around the liner 11 at a winding angle obliquely crossing the central axis CX of the liner 11. As the reinforcing fiber, carbon fiber, glass fiber, aramid fiber, or the like can be used. As the uncured resin, a thermoplastic resin may also be used. When a thermoplastic resin is used as the uncured resin, the thermoplastic resin is cured by cooling after the reinforcing fiber bundles are wound around the outer surface of the liner 11 in a state where the thermoplastic resin is softened.

The narrow fiber material may be formed narrower than the band-shaped reinforcing fiber bundles, and for example, a narrow reinforcing fiber bundle impregnated with an uncured resin or a fiber material compatible with the liner 11 may be used. The narrow reinforcing fiber bundles may be formed of the same reinforcing fibers and resins as the tape-shaped reinforcing fiber bundles, or may be formed of reinforcing fibers and resins different from the tape-shaped reinforcing fiber bundles. The narrow reinforcing fiber bundle may be formed by bundling reinforcing fibers into a narrow band shape, or may be formed by bundling reinforcing fibers into a narrow circular cross-sectional shape. As the fibrous material having compatibility with the liner 11, polyamide fiber (nylon fiber) may be used. The polyamide fiber may be 1 polyamide fiber or may be formed by bundling fine polyamide fibers.

The width and thickness of the narrow fiber material are designed to such an extent that the winding state of the reinforcing fiber bundle with respect to the liner 11 is not deteriorated when the band-shaped reinforcing fiber bundle is wound around the liner 11. That is, since the narrow fiber material and the band-shaped reinforcing fiber bundle are wound around the liner 11 so as to intersect each other, the fiber material and the reinforcing fiber bundle are partially overlapped with each other, but a fiber material having a width dimension and a thickness dimension that do not affect the strength and durability of the high-pressure tank 10 due to the overlapping is used. When the reinforcing fiber bundle and the polyamide fiber are used as the fiber material, the reinforcing fiber bundle and the polyamide fiber can have sufficient adhesiveness by heating the reinforcing fiber bundle and the polyamide fiber.

One of the joints 21 is made of metal such as aluminum or aluminum alloy. The one joint 21 is attached to the lining 11 so that a flange portion 23 is formed on the outer periphery of a cylindrical portion 22 as a main body and a part of the cylindrical portion 22 protrudes from the dome portion 15. A valve (not shown) for filling and discharging the fuel gas into and from the storage space 19 is attached to the through hole 24 inside the cylindrical portion 22. The other joint 26 is made of metal such as aluminum or aluminum alloy. The other joint 26 is formed to have substantially the same outer shape as the one joint 21, but differs from the one joint 21 in that it is closed inside the cylindrical portion 27.

The winding device of the reinforcing fiber bundle will be described with reference to fig. 2. Fig. 2 is a schematic configuration diagram of a winding device for reinforcing fiber bundles according to the present embodiment. Fig. 2 shows an example in which a narrow reinforcing fiber bundle is wound as a fiber material.

As shown in fig. 2, the winding device 30 includes: the first feeding device 31 for feeding the tape-shaped reinforcing fiber bundle F1 to the liner 11, the second feeding device 32 for feeding the narrow reinforcing fiber bundle F2 to the liner 11, and the rotating mechanism 33 for rotating the liner 11 so as to wind the reinforcing fiber bundles F1 and F2. The 1 st and 2 nd feeding devices 31 and 32 are provided so as to face each other with the rotating mechanism 33 interposed therebetween, and the feeding direction of the reinforcing fiber bundle F1 with respect to the liner 11 is opposite to the feeding direction of the reinforcing fiber bundle F2. In the winding device 30, the reinforcing fiber bundle F2 is wound around the liner 11 in parallel with the winding operation of the reinforcing fiber bundle F1 around the liner 11.

The 1 st feeding device 31 has a plurality of payout shafts 41, a plurality of feeding rollers 42a to 42f, and a fiber bundle guide 46. A feed path of the reinforcing fiber bundle F1 from the bobbin 43 provided on each payout shaft 41 toward the liner 11 is formed by the payout shafts 41, the feed rollers 42a to 42F, and the fiber bundle guide 46. Each bobbin 43 is wound in advance with a reinforcing fiber bundle F1 (prepreg) containing an impregnated resin. The reinforcing fiber bundle F1 fed out from each bobbin 43 is collected by the supply roller 42b via each supply roller 42a, and is fed out to the fiber bundle guide 46 via the supply rollers 42e and 42F after the tension is adjusted by the supply rollers 42c and 42 d.

The feed roller 42c is a so-called tension roller, and is connected to a tension adjusting mechanism 44. The tension adjusting mechanism 44 moves the supply roller 42c to adjust the tension at the time of winding the reinforcing fiber bundle F1 around the liner 11. The supply roller 42d is a so-called dancer roller, and is connected to an active dancer controller 45. The distance between the feed roller 42d and the feed roller 42e is adjusted by moving the feed roller 42d by the active slack adjuster 45. Thus, even when the winding speed is changed while the winding of the reinforcing fiber bundle F1 is stopped, the tension of the reinforcing fiber bundle F1 is maintained constant.

The fiber bundle guide 46 is a guide mechanism for guiding the reinforcing fiber bundle F1 to the liner 11. The fiber bundle guide 46 is provided with a pair of widening rollers 47a and 47b and a delivery roller 48. The pair of widening rollers 47a and 47b form 1 band-shaped reinforcing fiber bundle F1 by widening the width thereof with the plurality of reinforcing fiber bundles F1 interposed therebetween, and the delivery roller 48 delivers the band-shaped reinforcing fiber bundle F1 having passed through the widening rollers 47a and 47b to the liner 11. The fiber bundle guide 46 is reciprocated in the axial direction of the liner 11 by an actuator (not shown). Further, the winding form of the reinforcing fiber bundle F1 can be changed by changing the movement path of the reciprocating movement of the fiber bundle guide 46, the rotational speed of the liner 11, and the like.

The 2 nd feeding device 32 has a plurality of payout shafts 51, a plurality of feeding rollers 52a to 52f, and a fiber bundle guide 56. A tension adjusting mechanism 54 is connected to the supply roller 52c, and an active tension adjustment controller 55 is connected to the supply roller 52 d. The fiber bundle guide 56 is provided with a pair of widening rollers 57a and 57b and a delivery roller 58. Since the number of bobbins 53 of the 2 nd supply device 32 is smaller than that of the 1 st supply device 31, the narrow reinforcing fiber bundle F2 having a narrow width is fed from the 2 nd supply device 32. In each of the 2 nd supply devices 32, the configuration other than the delivery roller 58 of the fiber bundle guide 56 is the same as that of the 1 st supply device 31, and therefore, the description thereof is omitted.

The delivery roller 58 of the fiber bundle guide 56 incorporates a heating mechanism (not shown) for heating the narrow reinforcing fiber bundle F2. Therefore, when the narrow reinforcing fiber bundle F2 passes through the delivery roller 58, the delivery roller 58 heats the narrow reinforcing fiber bundle F2 to improve the adhesiveness of the narrow reinforcing fiber bundle F2. The heating means may be any heating means as long as it can heat the fibrous material such as the narrow reinforcing fiber bundle F2 passing through the fiber bundle guide 56. The heating mechanism may be incorporated in either one of the pair of widening rollers 57a and 57b and the delivery roller 58, or may be incorporated in all of the pair of widening rollers 57a and 57b and the delivery roller 58.

The rotation mechanism 33 rotatably supports the liner 11. The rotation mechanism 33 is provided with a motor 35, and the liner 11 is rotated around the central axis CX by the motor 35. The tape-like reinforcing fiber bundle F1 is taken up from the 1 st supply device 31 by the rotation of the liner 11, and the narrow reinforcing fiber bundle F2 is taken up from the 2 nd supply device 32. The tape-shaped reinforcing fiber bundle F1 is wound around the liner 11 so as to intersect the narrow reinforcing fiber bundle F2, and the tape-shaped reinforcing fiber bundle F1 is pressed against the liner 11 by the narrow reinforcing fiber bundle F2 having adhesive properties. This prevents the tape-shaped reinforcing fiber bundle F1 from slipping or making incomplete contact with the liner 11.

At this time, the band-shaped reinforcing fiber bundle F1 supplied from the 1 st supply device 31 and the narrow reinforcing fiber bundle F2 supplied from the 2 nd supply device 32 are wound in different winding manners with respect to the liner 11. For example, when the band-shaped reinforcing fiber bundle F1 is annularly wound around the liner 11, the narrow reinforcing fiber bundle F2 is spirally wound around the liner 11, and when the band-shaped reinforcing fiber bundle F1 is spirally wound around the liner 11, the narrow reinforcing fiber bundle F2 is annularly wound around the liner 11. As a result, the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are wound around the liner 11 in different winding directions, and the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 can intersect each other.

The following describes a step of forming the annular layer and a step of forming the spiral layer with reference to fig. 3 and 4. Fig. 3 is a diagram showing an example of the step of forming the annular layer according to the present embodiment. Fig. 4 is a diagram showing an example of the spiral layer forming step according to the present embodiment. In fig. 4, the spiral layer is simplified for convenience of description.

As shown in fig. 3, in the step of forming the annular layer L1 (see fig. 1), the band-shaped reinforcing fiber bundle F1 is annularly wound around the liner 11, the narrow reinforcing fiber bundle F2. is spirally wound around the liner 11 with the fiber bundle guide 46 of the 1 st supply device 31 and the fiber bundle guide 56 of the 2 nd supply device 32 being located on opposite sides across the liner 11, the band-shaped reinforcing fiber bundle F1 is supplied from the 1 st supply device 31 to the liner 11, and the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 of the narrow reinforcing fiber bundle F2. are supplied from the 2 nd supply device 32 to the liner 11 and are wound around the liner 11 from opposite directions to each other, so that the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are prevented from being entangled with each other.

By rotating the liner 11 about the center axis CX, the tape-like reinforcing fiber bundle F1 is wound around the liner 11 from the 1 st supply device 31 at a winding angle substantially orthogonal to the center axis CX, and the narrow reinforcing fiber bundle F2 is wound around the liner 11 from the 2 nd supply device 32 at a winding angle obliquely intersecting the center axis CX. The fiber bundle guide 46 reciprocates along the central axis CX of the liner 11, and winds a band-like reinforcing fiber bundle F1 annularly around the cylindrical portion 17 of the liner 11. At the same time, the fiber bundle guide 56 reciprocates in an arc between both ends in the center axial direction of the liner 11 on the opposite side of the liner 11 from the fiber bundle guide 46, and the narrow reinforcing fiber bundle F2 is spirally wound around the liner 11.

More specifically, the winding position of the band-shaped reinforcing fiber bundle F1 is moved in the axial direction, and the narrow reinforcing fiber bundle F2 is wound around the liner 11 so as to intersect with the band-shaped reinforcing fiber bundle F1 while the band-shaped reinforcing fiber bundle F1 is wound around the cylindrical portion 17 of the liner 11. While the winding position of the band-shaped reinforcing fiber bundle F1 is shifted by the amount of one pitch (the amount of the width of the reinforcing fiber bundle F1) in the axial direction with respect to the cylindrical portion 17 of the liner 11, the narrow reinforcing fiber bundle F2 is wound around the liner 11. By repeating the winding of the tape-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 with respect to the liner 11, the tape-shaped reinforcing fiber bundle F1 can be wound around the liner 11 while being held by the narrow reinforcing fiber bundle F2.

Thereby, the band-shaped reinforcing fiber bundle F1 is wound annularly around the cylindrical portion 17 of the liner 11, and the narrow reinforcing fiber bundle F2 is wound spirally so as to hold the band-shaped reinforcing fiber bundle F1. Even if the side end of the band-shaped reinforcing fiber bundle F1 does not completely contact the outer surface of the liner 11, the winding surface of the band-shaped reinforcing fiber bundle F1 is brought into contact with the entire outer surface of the liner 11 by the narrow reinforcing fiber bundle F2. In addition, since the narrow reinforcing fiber bundle F2 is heated by the delivery roller 58, the adhesiveness of the narrow reinforcing fiber bundle F2 is increased, and the slip of the band-shaped reinforcing fiber bundle F1 with respect to the liner 11 is prevented.

In parallel with the operation of annularly winding the band-shaped reinforcing fiber bundle F1 around the liner 11, the narrow reinforcing fiber bundle F2 is spirally wound around the liner 11 so as to intersect the band-shaped reinforcing fiber bundle F1, thereby forming the annular layer L1 on the cylindrical portion 17 of the liner 11, the band-shaped reinforcing fiber bundle F1 is wound around the cylindrical portion 17 without a gap in the axial direction of the liner 11, and the narrow reinforcing fiber bundle F2 is spirally wound around the outer surface of the liner 11, thereby improving the reinforcing effect with respect to the annular layer L1 of the liner 11, and therefore, the number of layers of the annular layer L1 can be reduced to shorten the winding time of the band-shaped reinforcing fiber bundle F1 in accordance with the improvement of the reinforcing effect of the annular layer L1.

As shown in fig. 4, in the forming step of the spiral layer L2 (see fig. 1), the band-shaped reinforcing fiber bundle F1 is spirally wound around the liner 11, and in this case, the narrow reinforcing fiber bundle F2. is annularly wound around the liner 11, the winding form of the band-shaped reinforcing fiber bundle F1 is switched from the annular winding to the spiral winding by changing the movement path of the reciprocating movement of the fiber bundle guides 46 and 56 and the rotation speed of the liner 11, and the winding form of the narrow reinforcing fiber bundle F2 is switched from the spiral winding to the annular winding, and in the forming step of the spiral layer L2, the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are also wound around the liner 11 from opposite directions to each other, so that the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are prevented from being entangled with each other.

By rotating the liner 11 about the center axis CX, the tape-like reinforcing fiber bundle F1 is wound around the liner 11 from the 1 st supply device 31 at a winding angle obliquely crossing the center axis CX, and the narrow reinforcing fiber bundle F2 is wound around the liner 11 from the 2 nd supply device 32 at a winding angle substantially perpendicular to the center axis CX. The fiber bundle guide 46 reciprocates in an arc shape between both ends in the center axial direction of the liner 11, and winds a band-shaped reinforcing fiber bundle F1 spirally with respect to the liner 11. On the opposite side of the liner 11 from the fiber bundle guide portion 46 across the liner, the fiber bundle guide portion 56 reciprocates along the central axis CX of the liner 11, and annularly winds a narrow reinforcing fiber bundle F2 around the cylindrical portion 17 of the liner 11.

More specifically, the winding position and the winding angle of the tape-shaped reinforcing fiber bundle F1 are changed, and the narrow reinforcing fiber bundle F2 is wound around the liner 11 so as to cross the tape-shaped reinforcing fiber bundle F1 while the tape-shaped reinforcing fiber bundle F1 is wound around the liner 11. While the tape-shaped reinforcing fiber bundle F1 is wound around the liner 11 by one turn, the narrow reinforcing fiber bundle F2 is wound around the liner 11. By repeating the winding of the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 with respect to the liner 11, the band-shaped reinforcing fiber bundle F1 is wound around the liner 11 while being held down by the narrow reinforcing fiber bundle F2.

As a result, the band-shaped reinforcing fiber bundle F1 is wound in a spiral shape on the entire liner 11, and the narrow reinforcing fiber bundle F2 is wound in a ring shape so as to hold the band-shaped reinforcing fiber bundle F1. Even if the side end of the reinforcing fiber bundle F1 formed in a band shape does not come into partial contact with the outer surface of the liner 11, the narrow reinforcing fiber bundle F2 holds the winding surface of the band-shaped reinforcing fiber bundle F1 in contact with the entire outer surface of the liner 11. In addition, the narrow reinforcing fiber bundle F2 is heated by the delivery roller 58, and the adhesiveness of the narrow reinforcing fiber bundle F2 is increased, thereby preventing the slip of the band-shaped reinforcing fiber bundle F1 with respect to the liner 11.

In parallel with the operation of spirally winding the band-shaped reinforcing fiber bundle F1 around the liner 11, the narrow reinforcing fiber bundle F2 is annularly wound around the liner 11 so as to intersect the band-shaped reinforcing fiber bundle F1, thereby forming the spiral layer L2 so as to entirely cover the liner 11, the band-shaped reinforcing fiber bundle F1 is entirely wound around the outer surface of the liner 11 without a gap, and the narrow reinforcing fiber bundle F2 is annularly wound around the cylindrical portion 17 of the liner 11, thereby enhancing the reinforcing effect with respect to the spiral layer L2 of the liner 11, and therefore, the number of laminations of the spiral layer L2 can be reduced in accordance with the enhancement of the reinforcing effect of the spiral layer L2, and the winding time of the band-shaped reinforcing fiber bundle F1 can be shortened.

When the ring-shaped layer L and the spiral layer L are formed on the outer surface of the liner 11, the fiber-reinforced resin layer 12 is formed on the outer surface of the liner 11 by curing the uncured resin impregnated into the reinforcing fiber bundle F1 in the curing oven, and the overlapping of the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 occurs in the ring-shaped layer L and the spiral layer L, but the narrow reinforcing fiber bundle F2 has a smaller width and thickness than the band-shaped reinforcing fiber bundle F1, and therefore the strength and the like of the fiber-reinforced resin layer 12 are not deteriorated.

In the present embodiment, the annular winding and the spiral winding are performed in parallel with the liner 11, but the configuration may be such that the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are wound around the liner 11 so as to intersect each other. For example, high-angle helical winding and low-angle helical winding having different winding angles may be performed in parallel. The high-angle helical winding is, for example, a helical winding in which the crossing angle (winding angle) with respect to the central axis CX is 70 degrees or more and 80 degrees or less, and the low-angle helical winding is, for example, a helical winding in which the crossing angle with respect to the central axis CX is 5 degrees or more and 30 degrees or less.

The crossing angle at which the narrow reinforcing fiber bundle F2 is wound with respect to the band-shaped reinforcing fiber bundle F1 wound around the liner 11 is not particularly limited, but the narrow reinforcing fiber bundle F2 is preferably wound around the liner 11 at a crossing angle of 60 degrees or more and 90 degrees or less with respect to the band-shaped reinforcing fiber bundle F1 wound around the liner 11. By making the intersection angle between the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 approximately orthogonal, the slip of the band-shaped reinforcing fiber bundle F1 can be effectively suppressed by the narrow reinforcing fiber bundle F2. The narrow reinforcing fiber bundle F2 may be wound around the liner 11 without a gap, or may be wound around the liner 11 at a constant winding interval.

As described above, in the method of manufacturing the high-pressure tank according to the present embodiment, the band-shaped reinforcing fiber bundle F1 is wound around the liner 11, and the narrow reinforcing fiber bundle F2 is wound around the liner 11 so as to hold the band-shaped reinforcing fiber bundle F1. This can suppress the side end of the band-shaped reinforcing fiber bundle F1 from not completely contacting the outer surface of the liner 11, and can suppress the band-shaped reinforcing fiber bundle F1 from being displaced from the outer surface of the liner 11. Since the narrow reinforcing fiber bundles F2 are formed to be narrow, even if the band-shaped reinforcing fiber bundles F1 and the narrow reinforcing fiber bundles F2 are wound around the liner 11, the wound state of the band-shaped reinforcing fiber bundles F1 around the liner 11 is not deteriorated. Therefore, the high-pressure tank 10 having improved strength, durability, and the like and stable quality can be manufactured.

In the present embodiment, the fibrous material such as the narrow reinforcing fiber bundle F2 is wound around the liner 11 while being heated, but the present invention is not limited to this configuration. If the fiber material has adhesiveness at normal temperature, or if the band-shaped reinforcing fiber bundle F1 can be sufficiently held without heating, the fiber material may not be heated.

In the present embodiment, the band-shaped reinforcing fiber bundle F1 and the narrow reinforcing fiber bundle F2 are wound around the liner 11 from opposite directions with the liner 11 interposed therebetween, but the present invention is not limited to this configuration. As long as the tape-shaped reinforcing fiber bundle F1 and the fiber material such as the narrow reinforcing fiber bundle F2 are not entangled with each other, the reinforcing fiber bundle F1 and the fiber material may be wound around the liner 11 from the same direction.

In the present embodiment, while the band-shaped reinforcing fiber bundle F1 is wound around the liner 11 once, the narrow reinforcing fiber bundle F2 may be wound around the liner 11 once, or while the band-shaped reinforcing fiber bundle F1 is wound around the liner 11 a plurality of times, the narrow reinforcing fiber bundle F2 may be wound around the liner 11 once.

Further, although the present embodiment has been described, the embodiment and the modification may be combined in whole or in part as another embodiment. The technology of the present disclosure is not limited to the present embodiment, and various changes, substitutions, and alterations can be made without departing from the spirit and scope of the technical idea. Further, if the technical idea can be realized in another manner by a technical advance or another derivative technique, the method can be implemented. Therefore, the claims cover all embodiments that can be included in the scope of the technical idea.