JP2010221401A - Method and apparatus for manufacturing composite container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a composite container having a desired shape and strength. <P>SOLUTION: In the manufacturing method, a fiber layer is formed by winding a tow prepreg 20 onto a liner 5 (step S4), the viscosity of the resin of fibers wound onto the liner 5 is decreased to be lower than the viscosity of the resin before the fibers are wound onto the liner 5 by carrying out heating from the inside of the liner 5 (step S5), and the resin, the viscosity of which is decreased, in the fiber layer is heated from the inside of the liner 5 and cured gradually from a side close to the surface of the liner 5 toward a side separated from the surface (step S6). Since the resin whose viscosity is decreased is made easy to penetrate between the fibers, it is not voided between the fibers, so that the adhesion between the fibers is improved. In the manufacturing method, since the resin can be wound onto the cured fibers, the slide between the fibers can be suppressed. In the manufacturing method, since heating is carried out from the inside of the liner 5, the resin in a part inside the composite container can enough be cured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a composite container that stores high-pressure gas or liquid, and a composite container manufacturing apparatus.

  Conventionally, composite materials using glass fibers, carbon fibers, aromatic polyamide fibers, etc. as reinforcements and epoxy resins, unsaturated polyester resins, vinyl ester resins, etc. as matrix resins have been widely used for sports equipment and automobile parts. Yes.

  As a method for producing a composite material, a method is widely adopted in which a fiber reinforced material is impregnated with an uncured matrix resin to form a prepreg, and the prepreg is molded and cured. On the other hand, a hollow material forming method using FW, a so-called FW method, is also widely used as a method for producing a composite material.

  In the FW (filament winding) method, a strand prepreg impregnated with a thermosetting resin matrix is prepared in advance, and this is wound around a mandrel (Dry FW method), and while the strand is impregnated with a low-viscosity resin, It is well known that there is a method (Wet FW method) in which a mandrel is wound around and formed. Furthermore, the Wet FW method is classified into a kiss touch method, a dipping method, and other methods depending on the type of method in which the strand is impregnated with the low viscosity resin.

  The current mainstream in FW molding is a so-called Wet method such as a resin bath method using a liquid resin. FIG. 1 shows a schematic conceptual diagram of an example of a production apparatus for a tank having a resin bath used in the Wet method.

  The manufacturing apparatus shown in FIG. 1 impregnates a supply roll 101 in which a tow of carbon fiber or the like is wound, a resin bath 103 in which a resin 102 is stored, a rotary roll 104 that is rotatably provided in the resin bath 103, and a resin. And a liner 105 for winding a tow and forming a tank.

  Tows supplied from a plurality of supply rolls 101 are guided into the resin bus 103. The carbon fibers in the resin bath 103 are impregnated with resin while being guided along the periphery of the rotary roll 104. Excess resin is squeezed out by the resin content adjusting roll 106, and the resin content is adjusted. The tow whose resin content has been adjusted is wound around the liner 105 while the tension at the time of winding is adjusted by the winding tension adjusting unit 107.

  In the resin bath method, after the tow is passed through the resin bath 103 and impregnated with resin, excess resin is squeezed out by the resin content adjusting roll 106 to adjust the resin content, resulting in friction with the tow, yarn breakage, Tow damage with fuzzing occurs. Moreover, since resin content is adjusted by squeezing out resin, it is difficult to adjust resin content with high precision.

  Moreover, since the resin bath method allows the tow to pass directly through the resin bath 103, there is a problem that the inside of the resin bath 103 is fouled by fuzz or the like.

  Furthermore, the resin accommodated in the resin bath 103 has a low viscosity of, for example, about 0.1 Pa · S. If the rotating roll 104 is rotated at high speed in such a low-viscosity resin, the resin is scattered, and therefore the rotation speed of the rotating roll 104 is limited. In addition, since a low-viscosity resin is used, the tow wound around the liner 105 is in a slippery state. For this reason, in the Wet method, it is necessary to repeat such control that the apparatus is temporarily stopped to solidify the resin, and the apparatus is driven again when solidified in order to obtain a desired shape of the molded product. For these reasons, it is difficult to improve the productivity of the Wet method.

  In the resin bath method, a highly reactive resin is often used, so that the curing reaction gradually proceeds at room temperature, and the resin viscosity tends to increase during winding. Such a change in viscosity affects the amount of resin pick-up, and as a result, the uniformity of the resin content is impaired.

  In this way, molded products manufactured by the resin bath method have low quality stability due to the difficulty of maintaining a constant weight ratio between fiber and resin, and to prevent damage caused by tow friction. There are problems such as high manufacturing costs due to low production speed.

  Therefore, a so-called Dry method in which FW is performed using a tow prepreg impregnated with a resin in advance may be used. FIG. 2 shows a schematic conceptual diagram of an example of a tank manufacturing apparatus using a tow prepreg. Here, the “tow prepreg” means a fiber bundle impregnated with a resin to be in a semi-cured state.

  The manufacturing apparatus shown in FIG. 2 includes a supply roll 201 around which a tow prepreg is wound, a winding tension adjusting unit 207, and a liner 205 that forms a tank. In addition, as a method for producing a tow prepreg, for example, in Patent Document 1, a matrix resin is supplied to a tow at a constant supply amount via a nozzle, and the tow passing through the nozzle is controlled at a constant speed. There has been proposed a production method capable of realizing the uniformity of the resin impregnation amount in tow.

  Since the tow prepreg supplied from the supply roll 201 is already impregnated with resin, the tow prepreg is wound around the liner 205 while adjusting the winding tension by the winding tension adjusting unit 207 without passing through the resin bath. At the time of winding the tow prepreg around the liner 205, the tow prepreg is cured by heating the tow prepreg from the outside of the liner 205. The viscosity of the resin impregnated in the tow prepreg is about 5 to 100 Pa · S at the portion of the supply roll 201, and is about 10 Pa · S when wound around the liner 205, and the viscosity is higher than that of the wet method tow. high.

  According to the Dry method using a tow prepreg, the problems of the Wet method are solved. That is, according to this method, it is possible to increase the accuracy of the amount of resin contained, and tow damage that occurs when the resin is squeezed out, such as yarn breakage and fluffing, does not occur. In addition, since no resin bath is used, there is no limitation on productivity improvement due to the contamination of the resin bath and the viscosity of the resin.

JP 2006-300194 A WO2004 / 070258

  However, when a tank is manufactured by the Dry method using a tow prepreg, there is a problem that fibers are difficult to permeate during FW because the resin viscosity is relatively high.

  Further, in the Dry method, the resin has a higher viscosity than the Wet method, so that the resin is less likely to penetrate between the fibers. Therefore, the adhesion between the fibers is low, and it may be difficult to ensure the strength of the tank. In addition, since the resin is semi-cured in the tow prepreg, voids (voids) are more easily generated between the laminated tow prepregs than in the case where the resin is uncured.

  In addition, in heating only from the outside, the inner fibers return to room temperature after winding. Since the inside is not sufficiently solidified due to a decrease in temperature, it may be difficult to ensure the strength of the tank.

  Furthermore, in the Dry method in which heating is performed only from the outside, if the amount of winding of the fiber is increased, the fiber is overlapped and wound before the resin wound inside is cured. For this reason, slipping occurs between the fibers, and it may be difficult to form a tank having a desired shape.

  Then, an object of this invention is to provide the manufacturing method of the composite container which has a desired shape and intensity | strength, and the manufacturing apparatus of a composite container.

  Therefore, in order to achieve the above object, the method for manufacturing a composite container of the present invention includes a step of winding a fiber pre-impregnated with a thermosetting resin around a liner to form a fiber layer, and heating from the inside of the liner. The step of lowering the viscosity of the fiber resin wound around the liner below the viscosity before winding around the liner, and after reducing the viscosity, heating the fiber layer resin from the liner surface And a step of gradually curing toward the side away from the side close to.

  As described above, in the method for manufacturing a composite container of the present invention, since the heating is performed from the inside of the liner, the viscosity of the resin of the fiber wound around the liner is made lower than the viscosity before being wound around the liner. The resin having a lowered viscosity is easy to permeate between the fibers, so that there is no space between the fibers, and the adhesion between the fibers is improved. As a result, the strength as a composite container can be increased.

  Moreover, since the manufacturing method of the composite container of this invention heats from the inside of a liner, resin can be hardened gradually toward the side which leaves | separates the fiber layer from the side close | similar to the surface of a liner. For this reason, since resin can be wound around the hardened | cured fiber, the slip between fibers can be suppressed, As a result, a composite container can be formed in a desired shape. Moreover, since this manufacturing method heats from the inside of a liner, since the resin of the inner part of a composite container can also fully harden | cure, the intensity | strength as a composite container can be raised.

  According to the present invention, a composite container having a desired shape and strength can be manufactured.

It is a typical conceptual diagram of an example of the manufacturing apparatus of the tank which has a resin bath used for the Wet method. It is a schematic conceptual diagram of an example of the manufacturing apparatus of the tank using a tow prepreg. It is a typical conceptual diagram of the manufacturing apparatus of the composite container which concerns on one Embodiment of this invention. It is a figure which shows the manufacture flow of the manufacturing method of the composite container which concerns on one Embodiment of this invention.

  FIG. 3 is a schematic diagram for explaining a manufacturing apparatus used in the method for manufacturing a composite container according to the present embodiment. In the following description, “inside of the fiber layer” means a layer closer to the liner 5 among the layers of the tow prepreg 20 formed by being wound around the liner 5.

  The manufacturing apparatus 10 of the present embodiment includes a supply unit 1, a winding tension adjustment unit 2, a speed sensor pulley 3, a delivery eye 4, a liner 5, a drive device 6, an external heating device 7, and an internal heating device 8. And a control unit 9.

  The supply unit 1 is a device that supplies the tow prepreg 20 and includes a plurality of supply rolls 11 around which the tow prepreg 20 is wound. The tow prepreg 20 wound around the supply roll 11 is held in a state of maintaining a viscosity of 5 Pa · S to 100 Pa · S, preferably 7 Pa · S to 50 Pa · S. The supply speed of the tow prepreg 20 from the supply unit 1 is controlled by the control unit 9. In addition, although the supply part 1 in this embodiment demonstrates to an example the system by which the tow prepreg already manufactured is supplied in the state wound by the supply roll 11, this invention is not limited to this. For example, the supply unit 1 may employ a method in which a tow prepreg is manufactured by supplying resin to the tow and the manufactured tow prepreg is supplied.

  The winding tension adjusting unit 2 and the speed sensor pulley 3 are disposed between the supply unit 1 and the liner 5. The winding tension adjusting unit 2 is configured to be able to apply a required winding tension to the tow prepreg 20 wound around the liner 5, and the winding tension applied by the control unit 9 is controlled. The speed sensor pulley 3 is a speed sensor that senses the linear speed of the tow prepreg 20. The linear velocity of the tow prepreg 20 detected by the velocity sensor pulley 3 is transmitted to the control unit 9 from a signal transmitter (not shown). The control unit 9 controls the supply speed of the tow prepreg 20 from the supply unit 1 based on the signal from the signal transmitter. That is, the linear velocity of the tow prepreg 20 is constantly measured by the velocity sensor pulley 3 and fed back to the control unit 9 from the signal transmitter in real time. For example, when the velocity drops when the delivery eye 4 is turned back, or Even when the diameter of the winding molded body changes from the start of winding to the end of winding, the amount of resin supply is controlled, and the amount of resin impregnation with respect to the tow is controlled to be constant throughout the FW molding.

  The delivery eye 4 is a device that focuses the tow prepreg 20 supplied from the supply unit 1 and winds the tow prepreg 20 around the liner 5 by FW, and is provided so as to be reciprocally movable in a direction parallel to the axial direction of the liner 5. The orientation angle of the tow prepreg 20 is determined by the ratio of the rotational speed of the liner 5 and the moving speed of the delivery eye 4. The moving speed of the delivery eye 4 is controlled by the control unit 9.

  The liner 5 is a metal hollow cylindrical member, and is rotationally driven by a driving device 6. The tow prepreg 20 that has passed through the delivery eye 4 is wound around the outer peripheral surface of the liner 5 by FW. The controller 9 controls the driving device 6 that rotationally drives the liner 5.

  The external heating device 7 is a heater that heats the tow prepreg 20 wound around the outer peripheral surface of the liner 5. The temperature control of the external heating device 7 is performed by the control unit 9.

  The internal heating device 8 includes a heater 8a and a fluid supply unit 8b, and is connected to the liner 5 via a pipe 8c. The internal heating device 8 heats the fluid by the heater 8a, and supplies the heated fluid to the liner 5 through the pipe 8c by the fluid supply unit 8b, thereby heating the tow prepreg 20 from the inside of the liner 5. It is. The pipe 8 c is connected to both ends 5 a of the liner 5, and constitutes a circulation path so that the fluid supplied from the internal heating device 8 to the liner 5 is returned to the internal heating device 8 again. In the present embodiment, air is used as a heating fluid. By using air as the heating fluid, the sealing structure of the connecting portion between the linearly driven liner 5 and the pipe 8c is simpler than when a gas other than liquid or air is used as the heating fluid. It is possible to However, the present invention does not exclude application of a gas other than liquid or air as a heating fluid. For example, an electric heater or the like can be used as the heater 8a, and a pump, a fan, or the like can be used as the fluid supply unit 8b.

  The fluid temperature in the liner 5 is detected by a temperature sensor 8d. The fluid temperature detected by the temperature sensor 8d is transmitted to the control unit 9. Based on the signal transmitted from the temperature sensor 8d, the controller 9 controls the heater 8a so that the fluid temperature becomes a predetermined temperature. In the present embodiment, the fluid temperature is controlled within a temperature range of about 40 ° C. to 130 ° C., but the temperature control range in the present invention is not limited to this, and the characteristics of the tow prepreg 20 to be applied. It may be appropriately changed depending on the situation.

  In the present embodiment, the temperature control is described as being performed by controlling the heater 8a. However, the present invention is not limited to this, and for example, the temperature is controlled by the amount of fluid supplied by the fluid supply unit 8b. Alternatively, a valve (not shown) may be provided in the middle of the pipe 8c, and the opening of the valve may be adjusted. Control of the opening degree of the fluid supply unit 8b and the valve is also performed by the control unit 9 based on a signal transmitted from the temperature sensor 8d.

  As described above, the control unit 9 drives and controls the supply unit 1, the winding tension adjusting unit 2, the delivery eye 4, the liner 5, the external heating device 7, the internal heating device 8, and the like.

  The reinforcing fiber of the tow prepreg 20 applicable to the present embodiment is not particularly limited, and specific examples include carbon fiber, glass fiber, alumina fiber, silicon carbide fiber, boron fiber, and aramid fiber, and particularly carbon fiber. Is preferably used. More preferably, carbon fibers that are difficult to be impregnated with resin, have a fiber diameter of 6 μm or less, and a fineness of 800 g / km or more can be used. Further, the resin impregnated in the tow is not particularly limited, and for example, a thermosetting resin, particularly an epoxy resin is preferable because it is easy to handle. The epoxy resin may be a one-component type epoxy resin using a latent curing agent, but it is preferable to use a two-component type epoxy resin having a lower viscosity while mixing with a static mixer. By using a static mixer, one of the problems in the conventional Wet method FW can be solved that the resin gradually reacts during winding to increase the viscosity, and therefore the resin impregnation amount increases. .

  Next, the manufacturing method of the composite container concerning this embodiment is demonstrated using FIG. FIG. 4 is a diagram showing a manufacturing flow of the manufacturing method of the present embodiment.

  First, the controller 9 supplies warm air into the liner 5 by the internal heating device 8 and raises the temperature of the liner 5 to a predetermined temperature (step S1). In the case of this embodiment, the liner 5 is temperature-controlled within a range of 30 ° C to 220 ° C.

  Next, the supply unit 1 supplies the tow prepreg 20 having a viscosity of 5 Pa · S to 100 Pa · S, preferably 7 Pa · S to 50 Pa · S, to the winding tension adjusting unit 2 (step S2). Subsequently, the tow prepreg 20 is focused by being supplied to the delivery eye 4 while adjusting the tension by the winding tension adjusting unit 2 (step S3). Further, the tow prepreg 20 is wound around the liner 5 being rotationally driven while being reciprocated in the direction parallel to the axial direction of the liner 5 by the delivery eye 4 (step S4).

  The controller 9 controls the temperature of the internal heating device 8 so as to reduce the viscosity of the resin of the tow prepreg 20 wound around the liner 5 by heating the liner 5 from the inside (step S5). For example, for the control of the heating temperature, the outer surface temperature is measured using a thermal image sensor, and the heater 8a is controlled. The temperature in the liner 5 at this time is set to 30 ° C. or higher and 100 ° C. or lower.

  The resin is in a state of high fluidity due to the reduced viscosity. Particularly in the case of this embodiment, since the internal heating device 8 heats the resin from the inner side of the liner 5, the winding progresses to the liner 5. The state of high fluidity can also be maintained for the resin in the inner portion of the fiber layer formed above. The resin of the tow prepreg 20 having improved fluidity is in a state where it easily penetrates between the tow prepregs 20, air bubbles between the tow prepregs 20 are removed, and adhesion between the tow prepregs 20 is enhanced.

  When the fiber layer is formed on the liner 5 as the winding progresses, the controller 9 controls the temperature of the internal heating device 8 to cure the resin of the tow prepreg 20 wound around the liner 5 (step) S6). In the case of this embodiment, the temperature in the liner 5 is set in the range of 30 ° C. to 220 ° C., preferably 60 ° C. or more and 220 ° C. or less, depending on the capacity of the liner and the viscosity of the resin.

  In the manufacturing method of the present embodiment, heat is gradually applied from the inside of the fiber layer by heating the inside of the liner 5 with warm air, so that the fiber layer of the tow prepreg 20 is directed from the inside to the outside (close to the liner 5). The resin can be gradually cured (toward the side away from the side). By reliably curing the resin from the inner part of the fiber layer, slipping between the tow prepregs 20 when the winding amount is increased is suppressed, and the composite container can be formed into a desired shape. Moreover, since this manufacturing method heats a fiber layer from the inside of the liner 5, since the resin of the inner part of a composite container can also fully harden | cure, the intensity | strength as a composite container can be improved.

  As described above, according to the manufacturing method of the present embodiment, the adhesion between the tow prepregs 20 is extremely high, and the resin inside the container is sufficiently cured, so that it has high pressure resistance and suppresses fiber slip. Therefore, a composite container molded into a desired shape can be manufactured.

  In this example, a cylindrical tube was manufactured by the method for manufacturing a composite container of the present invention under the following conditions, and its burst strength was measured.

  The resin impregnated in tow is 80 parts by weight of bisphenol A type epoxy resin, 20 parts by weight of bisphenol F type epoxy resin, 18 parts by weight of dicyandiamide (DICY), and 3- (3,4-dichlorophenyl) -1,1-dimethylurea. A resin composition in which 9 parts by weight of (DCMU) was mixed was used. The viscosity of this resin composition was 7 Pa · s at 25 ° C. and 0.1 Pa · s at 80 ° C. This resin composition was impregnated with 24000 filaments of carbon fiber T800SC manufactured by Toray Industries, Inc. and wound on a bobbin to obtain a tow prepreg having a resin content of 29%.

  The above-mentioned tow prepreg was filament wound (FW) into an aluminum cylindrical tube having an outer diameter of 99 mm and an inner diameter of 95 mm in the central portion. The FW conditions were helical rotation with a rotation speed of 200 rpm and a tension of 50 N, and the internal heating temperature was 80 ° C. In order to cure the resin, the internal heating temperature was set to 130 ° C. after the FW was completed, and the mixture was held for 2 hours and then allowed to cool.

  When the burst strength of the cylindrical tube produced as described above was measured, the burst pressure was 120 MPa.

  In this example, a cylindrical tube was manufactured by the method for manufacturing a composite container of the present invention under the following conditions, and its burst strength was measured.

  As the resin to be impregnated with tow, a resin composition in which 80 parts by weight of bisphenol A type epoxy resin, 20 parts by weight of phenol novolac type epoxy resin, 18 parts by weight of dicyandiamide (DICY) and 9 parts by weight of DCMU were used. The viscosity of this resin composition was 50 Pa · s at 25 ° C. and 0.2 Pa · s at 80 ° C. This resin composition was impregnated with 24000 filaments of carbon fiber T800SC manufactured by Toray Industries, Inc., wound up on a bobbin, and made into a tow prepreg having a resin content of 28%.

  The above-mentioned tow prepreg was filament wound (FW) into an aluminum cylindrical tube having an outer diameter of 99 mm and an inner diameter of 95 mm in the central portion. The FW conditions were helical rotation with a rotation speed of 200 rpm and a tension of 50 N, and the internal heating temperature was 80 ° C. In addition, at the time of FW, the bobbin of the tow prepreg was kept warm at about 40 ° C. with an infrared lamp in advance, and the instantaneous temperature change at the time of winding was alleviated. In order to cure the resin, the internal heating temperature was set to 130 ° C. after the FW was completed, and the mixture was held for 2 hours and then allowed to cool.

  When the burst strength of the cylindrical tube produced as described above was measured, the burst pressure was 125 MPa.

  In this example, a cylindrical tube was manufactured by the method for manufacturing a composite container of the present invention under the following conditions, and its burst strength was measured.

  In this example, Tow prepreg T800S-24-RC27-SY2 manufactured by Nippon Oil Corporation was filament wound (FW) into an aluminum cylindrical tube having an outer diameter of 99 mm and an inner diameter of 95 mm at the center. The FW conditions were helical rotation with a rotation speed of 200 rpm and a tension of 50 N, and the internal heating temperature was 80 ° C. In order to cure the resin, the internal heating temperature was set to 130 ° C. after the FW was completed, and the mixture was held for 2 hours and then allowed to cool.

  When the burst strength of the cylindrical tube produced as described above was measured, the burst pressure was 129 MPa.

Comparative Example 1

  In this comparative example, a cylindrical tube was manufactured without performing internal heating under the following conditions, and its burst strength was measured.

  In this comparative example, the same tow prepreg as in Example 1 was used, and FW was performed on the cylindrical tube under the same conditions except for the temperature conditions. In this comparative example, internal heating was not performed, FW was performed at room temperature, and for resin curing, the internal heating temperature was set to 130 ° C. for 2 hours after the completion of FW, and then allowed to cool.

  When the burst strength of the cylindrical tube produced as described above was measured, the burst pressure was 100 MPa.

Comparative Example 2

  In this comparative example, a cylindrical tube was manufactured by the WET method under the following conditions, and its burst strength was measured.

  In this comparative example, 100 parts by weight of a commercially available dilution type epoxy resin (trade name: Epicoat 801P, manufactured by Japan Epoxy Resin Co., Ltd.) and a commercially available imidazole curing agent (trade name: EMI24, manufactured by Japan Epoxy Resin Co., Ltd.) 4 A resin composition mixed with parts by weight was used. The viscosity of this resin composition was 1 Pa · s at 25 ° C. and 0.02 Pa · s at 80 ° C. In this comparative example, this resin composition was used as a WET resin. This resin composition was impregnated in the process of FW 24000 filaments of carbon fiber T800SC manufactured by Toray Industries, Inc., and FW was performed under the same conditions as in Example 1 (helical winding with a tension of 50 N, internal heating temperature was 80 ° C.) to cure the resin. Therefore, after completion of FW, the internal heating temperature was set to 80 ° C., held for 2 hours, and then allowed to cool. However, since the resin was scattered, the rotation speed was 60 rpm.

  When the burst strength of the cylindrical tube produced as described above was measured, the burst pressure was 110 MPa.

DESCRIPTION OF SYMBOLS 1 Supply part 2 Winding tension adjustment part 3 Speed sensor pulley 4 Delivery eye 5 Liner 5a Both ends 6 Drive apparatus 7 External heating apparatus 8 Internal heating apparatus 8a Heater 8b Fluid supply part 8d Temperature sensor 8c Piping 9 Control part 10 Manufacturing apparatus 11 Supply Roll 20 toe prepreg

Claims (5)

Winding a fiber pre-impregnated with a thermosetting resin around a liner to form a fiber layer;
Heating from the inside of the liner to reduce the viscosity of the resin of the fiber wound around the liner below the viscosity before winding around the liner;
A step of gradually curing the resin of the fiber layer toward the side away from the side close to the surface of the liner by heating from the inside of the liner after reducing the viscosity. Method. The temperature in the liner in the step of lowering the viscosity before winding around the liner is 30 ° C. or more and 100 ° C. or less,
The method for producing a composite container according to claim 1, wherein the temperature in the liner in the step of curing the resin is 60 ° C or higher and 220 ° C or lower.   The method for producing a composite container according to claim 1, wherein the fiber pre-impregnated with the thermosetting resin is a tow prepreg.   The manufacturing method of the composite container of any one of Claim 1 thru | or 3 which supplies the heated fluid to the inside of the said liner. A supply unit for supplying fibers pre-impregnated with thermosetting resin;
A liner that winds up the fibers supplied from the supply unit and forms a fiber layer on the outer peripheral surface;
An internal heating unit for heating the interior of the liner;
After reducing the viscosity of the resin of the fiber wound around the liner to be lower than the viscosity before winding around the liner, and reducing the viscosity, the resin layer from the side close to the surface of the liner And a control unit that controls the temperature of the internal heating unit so as to harden the container.

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