JPH10141594A - Liner mold for high pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten gas sealing performance and pressure tightness by integrating a disclike flange part and a cylindrical nozzle in a mouthpiece and pressure- welding a ringlike part between the outer peripheral surface of the cylindrical nozzle part of the mouthpiece and the inner peripheral surface of a cylindrical protruding part. SOLUTION: A liner mold 1 is a blow-molded product molded out of thermoplastic resin with a center body part B formed in cylindrical or almost cylindrical shape. Both upper and lower end parts are of dome shape, and a cylindrical protruding part 2 rising outward on a center axis of both ends is formed near the center of both ends. A mouthpiece 4 with an opening hole 3 for communicating the inside and outside parts of the liner mold 1 is inserted inside the protruding 1 part 2. In the mouthpiece 4, a disclike flange part 5 sticking closely to the internal wall surface of a dome A at both upper and lower end parts, and a cylindrical nozzle 6 protruded outward while sticking closely to the internal wall surface of the cylindrical protruding part 2 are integrated, and the mouthpiece 4 is provided with a ringlike part 7 pressfitted between the outer peripheral surface of the cylindrical nozzle part 6 and the cylindrical protruding part 2 to maintain gas sealing performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner molded product for a high-pressure container manufactured by a blow molding method using a thermoplastic resin as a raw material. And a liner molded product for a high-pressure container used for a high-pressure gas container having excellent pressure resistance.

[0002]

2. Description of the Related Art Recently, exhaust gas from gasoline automobiles has become a problem as one of the causes of air pollution mainly in urban areas. One of the countermeasures is to use compressed natural gas whose exhaust gas is clean. Cars are attracting attention. However, until now, metal tanks are mainly considered for fuel tanks whose contents are high-pressure compressed natural gas,
In this case, there is a problem that it is too heavy for an automobile intended to move around lightly. It is said that reducing the weight of fuel tanks is indispensable for the spread of natural gas vehicles.

[0003] In recent years, in addition to metal cylinders, cylinders having an aluminum liner for shielding the content gas and using a fiber-reinforced composite resin material (FRP) on the outside to increase the pressure resistance, and further weight reduction. The necessity of a cylinder having a liner made of a thermoplastic resin molded product for a targeted gas shield is required. In terms of the idea, as a high-pressure gas container aiming at such weight reduction, a cylindrical container called a liner (or a mandrel or the like) is made of a thermoplastic resin molded product, and the outer surface thereof is impregnated with a resin. There have been proposed many types of products in which fibers are wound and laminated by a filament winding method (hereinafter abbreviated as FW method) or the like and cured to obtain a product without extracting a cylindrical container.

For example, Japanese Patent Application Laid-Open No. 3-89098 discloses that
An FRP characterized in that an FRP reinforcing layer is laminated on the outer surface of a plastic cylindrical container whose base is reinforced by metal.
A gas container has been proposed, and a plastic cylindrical container as a liner can be manufactured by a conventional method such as a blow molding method, an injection molding method, and a reaction injection molding method. It is described as simple and desirable. In US Pat. No. 5,253,778, a non-metallic inner shell container called a liner is wrapped with a cylindrical outer shell container made of a fiber-reinforced composite resin called a shell, and a pressure is attached at both ends of the container with caps called bosses. A container has been proposed.

[0005] A European application (European Patent Publication N)
Umber 0550951A1) also discloses a non-metallic liner.
A pressure vessel has been proposed in which the outside of the vessel is reinforced by filament winding and bosses are attached to both ends of the vessel. NGV
The Super Cylinder technical data issued by Systems Inc. includes a thermoplastic resin liner reinforced with E-glass winding and an all-composite cylinder (Al
l-composite Cylinder) has been proposed.

[0006] Japanese Patent Application Laid-Open No. 7-055097 discloses a pressure vessel manufactured by the FW method using a mandrel (liner), wherein the pressure vessels for high-pressure fuel are different in the opening diameter of the dome at both ends. Has been proposed in which the winding band path in the FW method is kept linear. Japanese Patent Application Laid-Open No. 7-088817 does not disclose a method in which the outside of the liner is strengthened by the FW method. However, the pressure is such that the shear strength of only the portion requiring the shear strength is improved while the overall weight is reduced. There has been proposed a pressure vessel characterized by being formed by laminating carbon fiber reinforced plastic materials as a vessel and interposing a film-like resin for increasing the resin content between the respective layers, and a method of manufacturing the same.

[0007] In these high-pressure gas containers which have been conventionally proposed for weight reduction, most of the non-metallic liners including those made of thermoplastic resin cannot withstand the internal pressure alone. The withstand voltage is strengthened by the FW method or the like. In the case of the FW method, it is necessary that the shaft serving as the rotation axis be fixed to the center axis of the entire container. Therefore, bosses (caps) for fixing the shaft are attached to both ends of the container, and the boss is filled with gas. The feature is that it is also used as a jig for mounting the discharge valve.

Further, this boss is provided on the outer surface of the liner with FW.
Must be present in the liner, and must necessarily be incorporated into the liner. In fact, in the above-mentioned conventional high-pressure gas containers, the boss is fixed to a liner as an inner shell. Then, in the case of FW, a force for pushing the boss toward the inside of the container is exerted by the tension of the filament, and after the boss is formed, a force in a direction of pushing the boss to the outside of the container is exerted by the pressure of the high-pressure gas. In other words, the bosses attached to both ends of the container are firmly attached so that they can sufficiently withstand both the force pushing into the container and the force pushing out toward the outside of the container. Must be done.

In addition, it is generally assumed that these high-pressure containers are filled with a high-pressure gas of at least about 250 kgf / cm ² . Therefore, not to mention the overall compressive strength,
A major issue is whether or not the sealing between the inner wall surfaces at both ends of the liner and the boss (base) attached thereto is sufficient. When manufacturing a cylindrical container by the blow molding method,
Since it is impossible to incorporate a boss having a diameter larger than the diameter of the opening of the container into the inside of the container without destroying a part of the container later, it is inevitable to mount the boss inside the parison at the parison injection stage In this case, an insert blow molding method must be adopted.

However, in the conventional insert blow molding method, the boss mounted inside the container is fixed firmly inside the container so as to sufficiently withstand both of the above-mentioned forces during the blow molding process. Fixed, and 250Kgf / cm
It has been a problem that it is difficult to insert to be able to retain sufficient sealing against ² things propellant. Hereinafter, such a problem will be specifically described using the above-described conventional technique as an example.

FIG. 2 of Japanese Patent Application Laid-Open No. 3-89098 discloses one of the embodiments. The method of incorporating a base (boss) as shown in this figure is a typical method which is actually possible by the conventional insert blow molding method. Regarding the method of fixing the base, the description in the gazette “In the container (omitted) of FIG. 2, (omitted) the metal base 11 is fixed to the plastic part 12 of the plastic cylindrical container by an anchor effect on the outer surface of the metal base 11. As a result, a fine groove is formed over the entire surface. " However, there is no guarantee that the boss is firmly fixed to the container enough to withstand the force pushed into the inside of the container, and even if the filled high-pressure gas is a metal base. It is impossible to provide a sealing property for preventing leakage through the space between the outer surface of 11 and the inner surface of the plastic portion 12. According to experiments conducted by the present inventors in advance, the sealability that can be maintained by such a method is such that the gas pressure is at most 30 kgf /
It has been confirmed that when the pressure of the gas to be filled is up to about ² cm ^{2 and} the pressure of the gas exceeds this, a leak will surely occur.

FIG. 1 of the same publication (Japanese Unexamined Patent Application Publication No. 3-89098) illustrates another embodiment. In the publication, “the cylindrical container shown in FIG. The metal base 11 and the plastic were integrated and the metal base was integrated. The metal base 11 (omitted) of the plastic cylindrical container 10 (omitted) in FIG.
It comprises a cylinder 11b on which 11a is formed, and a skirt 11c extending in a trumpet shape downward from the cylinder 11b. Skirt part 11c
Are firmly fixed in the plastic part 12 of the plastic cylindrical container 10 by an anchor effect. There is an explanation. However, there is no disclosure as to how to fix such a metal die having a skirt portion extending in a trumpet shape in the plastic portion of the plastic cylindrical container in the form shown in FIG. 1 by blow molding. . That is, it is difficult to actually obtain FIG. 1 by the blow molding method.

US Patent Number 525377
In the embodiment shown in FIG. 4 of the publication of 8), there is an "upper lip near the opening inside the inner shell liner".
Dual-layer li consisting of a lower lip and a lower lip
p) is formed, and the boss is securely held in its position because the flange of the boss is sandwiched between these double lips. " Although there is no description in that the liner is necessarily manufactured by the blow molding method, the form in which the boss / flange portion is fixed in this manner is essentially the same as that described in JP-A-3-89098 No. 1
It is difficult to obtain by the blow molding method, as in the form shown in the drawing.

[0014] European Patent Publication N
The embodiment shown in FIG. 1 of the publication of Umber 0550951 A1) is completely the same as the above two examples, and it is difficult to carry out only by blow molding. However, in the case of this European application,
The end of the cylindrical liner (dome) to which the boss / flange is to be fixed is manufactured by injection molding, and only the body is manufactured by blow molding separately, and these are welded in a later process. In this case, molding is possible. But,
This method has another problem that the production of the liner is increased to at least three steps.

The supercylinder technical material issued by NGV Systems Inc. shows a flanged boss which is divided into two parts and adapted to be screwed together. In this mode, first insert one of the components inside to form a liner, remove it from the mold,
The other part is screwed in from the outside of the liner, and the liner opening is fastened from inside and outside with two boss parts. In this method, when the liner is made by an injection molding method other than the blow molding method, it is possible to increase the mechanical adhesion between the inserted boss and the liner. It is difficult to prevent leakage of the charged high-pressure gas of at least 250 kgf / cm ² alone. As described above, according to experiments conducted by the present inventor in advance, the sealability that can be maintained by such a method is that the gas pressure is up to about 30 kgf / cm ² at most.
It has been confirmed that when the pressure of the gas to be filled exceeds this, a leak will surely occur.

[0016]

SUMMARY OF THE INVENTION Accordingly, in view of the above situation, an object of the present invention is to provide a cylindrical container-shaped blow-molded article with a base, and the bases (bosses) attached to both ends act from inside and outside of the container. A high-pressure container used for high-pressure gas containers and the like, which is firmly mounted to withstand forces in any direction, and is especially used for high-pressure gas containers with excellent gas sealing properties and pressure resistance by winding and laminating an FRP reinforcing layer on its outer surface. To provide a liner molded article for use.

[0017]

As a result of various studies conducted by the present inventor to achieve the above object, the present inventors have completed a cylindrically molded blow-molded article with a base manufactured by insert blow molding. In other words, the liner molded product for a high-pressure container according to the present invention has a dome shape at both upper and lower ends, and a cylindrical projection that rises outward is formed at the center of both ends. A blow-molded product made of a thermoplastic resin having a cylindrical body or a substantially cylindrical shape with a central body part inserted therein, and a base having a dome. A disk-shaped flange portion that is in close contact with the inner wall surface and a cylindrical nozzle that is in close contact with the inner wall surface of the cylindrical protrusion and protrude to the outside are integrated, and the outer periphery of the cylindrical nozzle portion of the base and the cylindrical member The ring-shaped component is strongly pressed from both sides with the inner wall surface of the projection to maintain gas sealing.

In the present invention, the ring-shaped part is made of a material having a thermal adhesive property to both the base and the blow-molded article (thermoplastic resin), and the base of the base is preliminarily formed at the time of insert blow molding of the base. While the ring-shaped part is adhered to the groove-shaped depression provided on the outer periphery of the nozzle, blow
It is preferable from the viewpoint of gas sealability that the metal mold is clamped in the molding step and strongly bonded to and thermally bonded to a cylindrical projection formed from a part of the high-temperature parison. However, it is also possible to adhere to both the die and the blow-molded product using an appropriate adhesive. Further, in the present invention described above, the sealing performance due to the pinching pressure of the ring-shaped component is improved by screwing a skirted cap that tightens the outside of the cylindrical projection into a threaded portion on the outer peripheral surface of the cylindrical nozzle tip of the mouthpiece that protrudes to the outside. It is preferable to increase the pressure and increase the safety as a high-pressure gas container.

Further, the material of the ring-shaped part may be a thermoplastic resin such as an ionomer resin, a polyamide resin, an EVA (ethylene vinyl acetate copolymer) resin, a polyester resin, a polyimide resin, a thermoplastic elastomer, an acrylic resin, or an epoxy resin. Resin, phenolic resin, selected from thermosetting resins such as polyisocyanate resin, especially when the base is made of lightweight aluminum,
When the material of the ring-shaped part is an ionomer resin, it is most preferable because of its excellent thermal adhesiveness to the die.

The material of the molded liner of the present invention is not particularly limited as long as it is a thermoplastic resin which can be melt-extruded as a parison and blow-molded. It may be a single-layer or multilayer blow-molded product obtained by combining a plurality of types of thermoplastic resins. In particular, multi-layer blow-molded products in which HMW-HDPE (high molecular weight high-density polyethylene resin) and PA (polyamide resin) are laminated as two layers out of multiple layers have both good blow moldability and high gas barrier properties. preferable. The material of the die is not limited to aluminum, but may be iron or other metal, and may be a thermoplastic resin or a thermosetting resin molded product in some cases.

The above-described liner molded product for a high-pressure container according to the present invention is particularly useful when the ring-shaped component is thermally bonded to both the base and the blow molded product (thermoplastic resin) with a material having thermal adhesive properties. Since the ring-shaped part acts as an adhesive between the molded article itself and the base, and at the same time acts as a packing for the gas sealing material, sufficient sealing property for preventing leakage of the high-pressure gas is obtained. There is an effect that can be secured. In the case where the adhesive does not have thermal adhesiveness, an adhesive may be applied to adhere strongly. The above-mentioned base is used as a jig for fixing the rotating shaft during FW, and also as a jig for mounting a high-pressure gas filling / discharging valve.

[0022]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Embodiment 1 FIG. 1 shows an example of a molded product of a liner for a high-pressure container according to the present invention, in which an upper half (a lower half is omitted because of the same shape) as a schematic diagram of a longitudinal section. In FIG. 1, a liner molded product 1 has a dome shape at both upper and lower ends, and a cylindrical projection 2 which rises outward on the center axis of both ends near the center of both ends. A base 4 having an opening 3 for communicating the inside and the outside of the liner molded product 1 is inserted into the inside of the part 2, and the central body part B is made of a cylindrical or substantially cylindrical thermoplastic resin. The die 4 is a blow-molded product. The base 4 has a disk-shaped flange portion 5 that is in close contact with the inner wall surface of the dome A at both upper and lower ends, and a cylindrical nozzle 6 that is in close contact with the inner wall surface of the cylindrical protrusion 2 and protrudes to the outside. And a ring-shaped component 7 is pressed between the outer periphery of the cylindrical nozzle portion 6 of the base 4 and the inner wall surface of the cylindrical projection to maintain the gas sealing property.

In order to enhance the positioning and sealing effect of the ring-shaped part 7, it is desirable to provide a groove-shaped depression 8 approximately equal to the width of the ring-shaped part 7 around the outside of the cylindrical nozzle part 6. The hollow 9 is formed at one or more locations around the cylindrical nozzle portion 6 and the cylindrical projection 2, which prevents the liner molded product 1 and the base 4 from rotating relative to each other. This has the effect of preventing rotation and preventing pressure from being applied to the container from inside and outside. An inner screw 10 is provided on the inner wall at the upper end of the opening hole 3 of the cylindrical nozzle which protrudes to the outside.
Is used when fixing to a rotating shaft, or for mounting a high pressure gas charging / discharging valve or a connection pipe. On the outer wall of the cylindrical nozzle 6, an external screw 11 for attaching a metal fitting for appropriately tightening the cylindrical projection 2 from the outside is provided.

The liner molded product in FIG. 1 has a content of about 50 Liters and a longitudinal dimension of about 1240.
mm, and the outer diameter of the body B is about 250 mm. The material of the molded article body 1 is PA6 (polyamide resin), and the material of the base 4 is aluminum. The material of the ring-shaped component 7 was ionomer resin, specifically, Himilan 1652 manufactured by Mitsui-DuPont Polychemicals Co., Ltd. The ion type of this resin is Zn.

When the ring-shaped part 7 is mounted on the outer periphery of the cylindrical nozzle of the base 4, a thin strip of ionomer resin which has been softened by heating to about 100 ° C. has been heated to the same temperature in advance. It was wound while crimping around the outside of the base. The present inventor has made ASTM D3528 (Double Lap S
The bond strength between aluminum and the ionomer-resin Himilan 1652 obtained by a test performed in accordance with the hear test is 41 to 55 kgf / cm ² .

Since the material (ionomer resin) of the ring-shaped part 7 used in the present embodiment is a thermoplastic resin, the ring-shaped part 7 is clamped by die clamping during insert blow molding of a die. When a part of the parison is formed as the cylindrical protrusion 2, the parison is in a semi-molten state by the heat received from the high-temperature parison and has flexibility. In this state, by being cooled and solidified while being strongly pressed by the action of the mold clamping force, the sealing property as a gas seal packing material is further enhanced.

The reason why the dimensions of the molded article of the first embodiment are the above-mentioned values is that only the incidental amount is selected to be about 50 Liters, and these values themselves are not related to the essence of the present invention. Needless to say. These numerical values can be freely selected within a range where ordinary blow molding is possible. Similarly, the material of the molded article body is also a thermoplastic resin that can be blow-molded in a usual manner, and any resin may be used as long as it has an adhesive property with the material of the selected ring-shaped part. Good. Particularly, since the purpose of using the molded article is a liner for a high-pressure gas container, a resin having a high gas barrier property is more preferable.

FIG. 2 is a longitudinal sectional view showing the positional relationship between the blow molding die used for molding the embodiment of the present invention shown in FIG. 1 and the insert support for inserting the die into the parison. It is a schematic diagram. The insert support is composed of two parts, an insert support C and an insert support base D, and as a whole, the vertical movable base 12 of the blow molding machine main body.
It has a structure that can only be inserted into the hole from above. Therefore, attachment and detachment of the insert support to the table can be freely performed at any time. Upper end base 4 and lower end base 4 '
The distance between them is strictly determined by the length of the corresponding portion of the insert support C, and the position (height) of the entire end cap including the support C with respect to the mold is adjusted by the insert support base D.
Done by An air passage of an air blowing pipe 13 communicates with the column C, and air is blown into the parison through an air blowing hole 14 formed in the column C.
Is done through

Hereinafter, the blow molding step according to the present invention will be described step by step. (A) Parison injection step: As shown in FIG. 3, the left and right mold halves 15, 15 'are opened, and the upper and lower ends 4, 4' to be inserted are located at appropriate positions of the insert support C. Where the die 1 at the tip of the extruder is
6 to the high-temperature molten parison 17
It is injected so as to wrap the entire support column 4 'and the insert C from outside.

(B) Mold clamping step: As shown in FIG. 4, the mold halves 15, 15 'on the left and right sides are closed to perform mold clamping. At the time of this mold clamping, a high-temperature parison 1
The ring-shaped component 7 is pressed into contact with the member 7 and becomes semi-molten by receiving the heat.

(C) Blow-up step: As shown in FIG. 5, compressed air is blown into the parison to blow up the parison to the mold cavity shape. (D) Mold opening process: The left and right dies 15, shown in FIG.
As soon as 15 'is opened, the vertical movable base 1 of the blow molding machine body
2 is lowered, and the molded article is taken out of the mold by the product unloading device of the blow molding machine main body in the next product unloading step.
At this time, the insert support C is also taken out together with the molded product.

Then, in the last step of extracting and finishing the insert support, the insert support C is extracted from the molded product, and the burr portion is cut and removed. (The mold opening process, the product unloading process, the insertion column removal and the finishing process are not shown.)

Embodiment 2 FIG. 6 shows a blower for a high-pressure vessel liner in which the sealing performance of the blow molded article for a high-pressure vessel liner shown in FIG. 1 is further improved and the safety as a high-pressure gas vessel is improved. -It is a schematic diagram of the longitudinal section of the upper half (the lower half is abbreviate | omitted for the same shape) which shows an example of a molded article. In FIG. 6, a skirted external base 18 (see FIG. 7) for tightening the outside of the cylindrical projection 2 is screwed from the outside of the blow-molded product to the screw portion 11 on the outer peripheral surface of the cylindrical nozzle tip of the base 4 projecting to the outside. The ring-shaped component 7 is pinched by being screwed. In addition, the outer cap 18 with the skirt can be tightened through the skirt with the outer side of the cylindrical projection portion 2 as it is, but more preferably the outermost cap 19 can be used. That is, in FIG. 6, the outermost cap 19 is further screwed into the outer cap 18 from the outside, so that the skirt portion 20 of the outer cap 18 further tightens the outside of the cylindrical projection 2, and the ring-shaped component 7 is It is structured to be mechanically tightened. The left half of FIG.
The outer base 18 is connected to the ring-shaped part 7 by the outermost base 19.
Before tightening toward the base 4, and the right half shows the state after tightening by the outermost base 19. Other specifications of the blow molded product are the same as those in the first embodiment.

FIG. 7 is a perspective view showing an example of the structure of the external base 18. The outer base 18 has a conical outer surface,
Plural pieces (minimum 3 pieces) with a straight cylindrical inner surface
When the outermost cap 19 is screwed into the outer thread portion 21 provided on the outer periphery of the upper portion of the outer cap 18 when the outermost cap 19 is screwed from the outside, the skirt portion 20 whose outer surface expands in a conical shape is inward. The ring-shaped component 7 is pushed in from the outside of the cylindrical projecting portion 2 so that the distal end portion is pressed. The material of the external bases 18 and 19 is aluminum, but may be iron or other metal, or may be a resin molded product in some cases.

[0035]

As described above, the molded product of the liner for a high-pressure container according to the present invention can be simultaneously and integrally formed only in the blow molding process by inserting the base into the parison. In order to increase the degree of adhesion between the die and the inner wall surface of the molded product, the force of pushing the filament toward the inside of the container during the FW method prevents the die and the blow molded product from being pressed. (Thermoplastic resin), the pressure-resistant strength is sufficiently exhibited by the adhesive force of the ring-shaped parts pressed into contact with both sides, and after the product is formed, on the contrary, the force in the direction of being pushed out of the container by the pressure of the high-pressure gas and With respect to the gas seal, the disk-shaped flange portion of the base that is in close contact with the inner wall surface of the dome exhibits the pressure resistance and the above-mentioned ring-shaped component has a sufficient gas sealing action. This opens the way to extremely economically produce a liner made of a blow-molded product having a perfect seal between a filled high-pressure gas and a base, which has been difficult in the conventional insert blow-molding method. This will greatly contribute to the future trend of reducing the weight of high-pressure gas containers and the spread of such lightweight high-pressure gas containers.

[Brief description of the drawings]

FIG. 1 is an example of a molded article of a liner for a high-pressure container according to the present invention;
It is a longitudinal cross-sectional view of an upper half.

FIG. 2 is a longitudinal sectional view showing a positional relationship between a die used for molding in Embodiment 1 and an insert support for inserting a die into a parison.

FIG. 3 is a vertical sectional view showing a parison injection step of the first embodiment.

FIG. 4 is a longitudinal sectional view showing a mold clamping step according to the first embodiment.

FIG. 5 is a longitudinal sectional view showing a blow-up step of the first embodiment.

FIG. 6 is a longitudinal sectional view of an upper half showing another example of the present invention.

FIG. 7 is a perspective view of an external base.

[Explanation of symbols]

 Reference Signs List A Dome part B Central body part 1 Liner molded product 2 Cylindrical projection part 3 Opening hole 4 Cap 5 Disk-shaped flange part 6 Cylindrical nozzle part 7 Ring-shaped part 8 Groove 9 Detent recess 10 Internal screw 11 External screw 12 Upper and lower movable base of the molding machine body 13 Air blowing pipe 14 Air blowing hole 15, 15 'Left and right mold halves 16 Die 17 Parison 18 External base 19 Outer base 20 Skirt 21 External screw of external base C Support for insert D Support for insert base

Claims (5)

[Claims] 1. An upper and lower end portion having a dome shape, and a cylindrical protrusion rising outwardly formed at a center portion of both ends, and the inside and the outside of a molded product are communicated with the inside of the cylindrical protrusion. A mouthpiece having an opening hole is inserted, and a blow molded product made of a thermoplastic resin having a central body part having a cylindrical shape or a substantially cylindrical shape, wherein the mouthpiece has a disk-shaped flange portion closely contacting the inner wall surface of the dome. A cylindrical nozzle protruding to the outside in close contact with the inner wall surface of the cylindrical protrusion is integrated, and between the outer periphery of the cylindrical nozzle portion of the base and the inner wall surface of the cylindrical protrusion. A molded article of a liner for a high-pressure container, characterized in that a ring-shaped part is strongly pressed from both sides to maintain gas sealing properties. 2. The ring-shaped part is made of a material having a thermal adhesive property to both the base and the cylindrical projection, and is provided beforehand around the outer periphery of the base cylindrical nozzle at the time of insert blow molding of the base. While the ring-shaped part is adhered to the groove-shaped depression, it is strongly bonded to the cylindrical projection formed from a part of the high-temperature parison by the mold clamping in the blow molding step, and is thermally bonded. The molded article of the liner for a high-pressure container according to claim 1, wherein: 3. A skirted cap for tightening the outside of the cylindrical projection is screwed into a thread on the outer peripheral surface of the tip of the cylindrical nozzle of the mouthpiece protruding to the outside, thereby enhancing the sealing performance of the ring-shaped component due to the pinching pressure. The safety as a high-pressure gas container is enhanced.
A liner molded product for a high-pressure container according to the above. 4. The ring-shaped part is made of an ionomer resin, a polyamide resin, EVA (ethylene vinyl acetate.
Copolymer) resin, polyester resin, polyimide resin, thermoplastic elastomer, thermoplastic resin such as acrylic resin, or resin selected from thermosetting resins such as epoxy resin, phenolic resin and polyisocyanate resin. The liner molded product for a high-pressure container according to any one of claims 1 to 3, wherein: 5. The liner molded article for a high-pressure container according to claim 1, wherein the base is made of aluminum, and the ring-shaped part is made of an ionomer resin.