High-pressure inner container formed by blow molding of plastic bottle blank and production method of high-pressure inner container

Abstract

The invention relates to the technical field of blowing of high-pressure storage tanks, in particular to a high-pressure inner container formed by blow molding of plastic bottle blanks and a production method. The high-pressure inner container comprises an inner container body formed by blowing a plastic bottle blank and a metal pipe opening installed at an opening of the inner container body, a turned-over edge turned over outwards is arranged at the opening of the inner container body, and the metal pipe opening comprises a locking block and a metal valve block which are coaxially installed at the opening of the inner container body; the locking block is an annular body with an external thread, the inner ring diameter of the locking block is matched with the outer diameter of the opening of the inner container, the upper end of the locking block is provided with a clamping groove matched with the turned-over edge, and the lower end of the locking block is provided with a tool inserting hole; the metal valve block is of a tubular structure coaxially arranged with the opening of the inner container, the lower end of the metal valve block is fixedly connected with a spherical crown-shaped spherical crown supporting part, the inner side face of the spherical crown supporting part is provided with an installation groove for containing the locking block, and the side wall of the installation groove is provided with an installation groove internal thread matched with the locking block external thread. According to the invention, an inner container formed by blowing a plastic bottle blank can be tightly connected with a metal bottle opening; the metal pipe orifice has the characteristics of light weight, low cost and easiness in processing and forming of plastic materials, and also has the advantages of high strength and good sealing performance of the metal pipe orifice.

Description

Technical Field

[0001] The present invention relates to the technical field of blow molding of high-pressure storage tanks, in particular to a high-pressure inner liner for blow molding of a plastic bottle embryo and a production method thereof. Background Art

[0002] Hydrogen for vehicles is stored at high pressure in hydrogen storage cylinders. Currently, there are four types of hydrogen storage cylinders: all-metal cylinders, metal liner fiber hoop-wrapped cylinders, metal liner fiber fully wrapped cylinders and non-metal liner fiber fully wrapped cylinders. All-metal cylinders, metal liner fiber hoop-wrapped cylinders and metal liner fiber fully wrapped cylinders have relatively large weight and volume, making it difficult to meet the hydrogen storage density requirements per unit mass. They are not ideal for on-board hydrogen supply systems, while non-metal liner fiber fully wrapped cylinders have the defect of a loose connection between the metal bottle mouth and the non-metallic liner, which makes it easy for hydrogen leakage to occur during use, posing a huge safety hazard. Chinese patent application No. 2019101499077 discloses "A Plastic Liner Fully Wrapped Carbon Fiber Hydrogen Storage Cylinder," published as CN109751506A. The hydrogen storage cylinder comprises a metal mouth, a plastic liner, and a metal cover. The metal cover is provided with a threaded through-hole extending vertically through the metal, and a downwardly bent vertical hem is provided at the edge of the metal cover. The metal mouth and the plastic liner are blow-molded as a single unit. An inwardly recessed annular receiving groove is provided at the top of the plastic liner. The inner wall of the metal mouth is provided with an internal thread that mates with the bottle mouth valve, and the outer wall of the metal mouth is provided with an external thread that mates with the threaded through-hole. When the metal cover is screwed onto the metal mouth, the vertical hem is locked into the annular receiving groove. The hydrogen storage cylinder secures the plastic liner's shoulder with a claw on the metal cover, achieving a secure connection and improving safety. Since the claws on the metal cover need to be deep enough to fit into the annular receiving groove on the shoulder of the plastic liner and cannot penetrate the plastic liner, the thickness of the shoulder of the plastic liner must be greater than other parts, which increases the weight of the liner. In addition, when the plastic liner is subjected to a large axial force, the claws on the metal cover still have the risk of detaching from the annular receiving groove. The connection between the metal bottle mouth of the hydrogen storage cylinder and the plastic liner is still a weak link in pressure resistance and sealing, and the reliability of its connection needs to be further improved. My other Chinese patent application 2024113823034 discloses "Blow-molded high-pressure liner with pre-set metal nozzle and production method", application publication number CN119084793A. The high-pressure liner includes a blow-molded liner and a metal nozzle mounted at the opening of the blow-molded liner. The metal nozzle includes a fixing coaxially mounted on the inside of the neck, an external clamp sleeved on the outside of the neck, and a locking nut threadedly connected to the fixing. The inner end of the fixing includes a disc that snaps onto the opening of the blow-molded liner, while the outer end of the fixing extends out of the blow-molded liner and is provided with external threads for mounting the locking nut. The lower end of the external clamp and the disc together form a clamping mechanism for the blow-molded liner, and the upper end of the external clamp abuts against the bottom of the locking nut. This high-pressure liner can pre-place a larger fixing in the blow-molded liner. The metal nozzle has a secure connection, good sealing performance, and high compressive strength. There are no special requirements for the strength of the shoulder and neck of the blow-molded liner, which helps reduce the amount of plastic material used in the liner and reduce the overall weight.Commonly used raw materials for blow molding include thermoplastics such as polyethylene terephthalate (PET), polypropylene (PP), and polycarbonate (PC). The production of these plastic bottles typically involves multiple steps, including injection molding, stretching, and blow molding. First, plastic pellets are preformed into a solid preform using injection molding. The solid preform is then heated, stretched, and blown. The method disclosed in Patent Application No. 2024113823034 is not suitable for preformed solid preforms. Summary of the Invention

[0003] In order to solve the problems of the above-mentioned prior art, the present invention provides a high-pressure inner liner for blow molding of a plastic bottle embryo and a production method, wherein the metal nozzle has a firm connection, good sealing performance and high compressive strength. While ensuring the firm connection and good sealing performance of the metal nozzle, the amount of material used in the plastic inner liner is minimized and the overall weight is reduced.

[0004] To achieve the above object, the present invention provides the following technical solutions: The high-pressure inner liner of a plastic bottle preform blow-molded according to the present invention includes an inner liner blown from a plastic bottle preform and a metal nozzle installed at the opening of the inner liner, the opening of the inner liner is provided with a flange folded outward, and the metal nozzle includes a locking block and a metal valve block coaxially installed at the opening of the inner liner; the locking block is an annular body with an external thread, the inner ring diameter of the locking block is adapted to the outer diameter of the opening of the inner liner, the upper end of the locking block is provided with a card groove adapted to the flange, and the lower end is provided with a tool insertion hole; the metal valve block is a tubular structure coaxially arranged with the opening of the inner liner, the lower end of the metal valve block is fixedly connected to a spherical crown support part, the inner side surface of the spherical crown support part is provided with a mounting groove for accommodating the locking block, and the side wall of the mounting groove is provided with an inner thread of the mounting groove adapted to the external thread of the locking block.

[0005] With this structural design, the high-pressure inner liner for blow-molding a plastic preform combines the lightweight, low-cost, and easy-to-process characteristics of plastic with the strength and sealing properties of a metal nozzle. Furthermore, the connection between the plastic material and the metal nozzle is structurally strong, has excellent sealing properties, and offers high compressive strength, making it easier to organize the blow molding of the plastic preform.

[0006] Preferably, the lower end surface of the metal valve block extends into the mounting groove and is flush with the lower end surface of the mounting groove, and the outer diameter of the lower end of the metal valve block in the mounting groove matches the inner diameter of the inner tank opening.

[0007] With the above structural design, after assembly, the lower end of the metal valve block extends into the bottle mouth of the plastic bottle preform, supporting the bottle mouth from the inside of the plastic bottle preform to prevent the bottle mouth from deformation; the specifications of the gas cylinder interface are not affected by the bottle preform, which is conducive to unifying the specifications of the gas cylinder interface.

[0008] Preferably, an O-ring is provided at the junction between the bottom of the mounting groove and the metal valve block.

[0009] The above structural design can improve the sealing effect between the plastic bottle blank and the metal pipe mouth.

[0010] Preferably, a valve block internal thread is provided in the inner cavity of the metal valve block.

[0011] The above structural design can facilitate the connection between the metal valve block and the blow molding machine, and can also facilitate the connection between the finished high-pressure liner and gas-using equipment such as the gas valve.

[0012] Preferably, the thickness of the spherical cap support portion gradually decreases from the inside to the outside.

[0013] The above structural design can further reduce the weight while ensuring the structural strength of the metal pipe mouth.

[0014] Preferably, the locking block and the flange are an integrated structure.

[0015] The above structural design can further reduce the number of parts, improve production efficiency and enhance the sealing performance of the bottle mouth.

[0016] The method for producing a high-pressure inner liner by blow molding a plastic bottle preform according to the present invention comprises the following steps: 1) Prepare a metal nozzle and a plastic bottle preform, wherein the opening of the plastic bottle preform is provided with an outwardly folded flange; the metal nozzle includes a locking block and a metal valve block coaxially mounted at the opening of the plastic bottle preform; the locking block is an annular body with an external thread, the inner ring diameter of the locking block being adapted to the outer diameter of the opening of the plastic bottle preform, the upper end of the locking block being provided with a slot adapted to the flange, and the lower end of the locking block being provided with a tool insertion hole; the metal valve block is a tubular structure coaxially mounted with the opening of the plastic bottle preform, the lower end of the metal valve block being fixedly connected to a spherical crown support portion, the inner side surface of the spherical crown support portion being provided with a mounting groove for accommodating the locking block, and the sidewalls of the mounting groove being provided with internal mounting groove threads adapted to the external threads of the locking block; 2) Connect the metal valve block to the opening of the plastic bottle preform so that the upper end surface of the opening of the plastic bottle preform contacts the bottom of the installation groove. Insert the locking block from the lower end of the plastic bottle preform into the opening of the plastic bottle preform so that the flange is locked into the groove; 3) Install the locking block into the mounting groove on the inner side of the spherical crown support. Use the locking tool to tighten the locking block until the upper end of the locking block contacts the bottom of the mounting groove. 4) Place the plastic bottle preform with the metal nozzle assembled into the preform baking equipment, and heat the plastic bottle preform according to the set temperature and time to soften the plastic bottle preform; 5) The heated plastic preform with the metal nozzle is placed into the blow molding mold. The blow molding equipment injects compressed air into the plastic preform through the metal valve block, causing the plastic preform to expand and fit the inner wall of the blow molding mold to form an inner liner. 6) Demolding and taking out the blow-molded liner; 7) Wrap and wind the carbon fiber layer on the outer surface of the liner.

[0017] By adopting the above method, the inner liner formed by blowing the plastic bottle embryo can be tightly connected with the metal bottle mouth.

[0018] Preferably, in step 1), an O-ring is embedded on the bottom surface of the mounting groove of the prepared metal valve block.

[0019] By adopting the above method, the sealing performance between the inner liner and the metal bottle mouth can be further improved.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The inner liner formed by blowing a plastic bottle preform can be tightly connected to the metal bottle mouth; it has the characteristics of light weight, low cost and easy processing and molding of plastic material, and the advantages of high strength and good sealing performance of the metal nozzle; the specifications of the air valve interface are not affected by the bottle body, which is convenient for using a unified gas cylinder interface on bottles of different specifications; at the same time, the connection between the plastic material and the metal nozzle has a firm structure, good sealing performance, high compressive strength, and is convenient for organizing the blowing of plastic bottle preforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic cross-sectional view of the assembled plastic bottle blank and the metal nozzle according to one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the bottle after blow molding.

[0023] Figure 3 It is a schematic diagram of the assembly structure of the plastic bottle blank and the metal nozzle.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the locking block.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the locking block from another angle.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the metal valve block.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the metal valve block from another angle.

[0028] Figure 8It is a partial cross-sectional structural schematic diagram of another embodiment of the present invention after the plastic bottle blank and the metal nozzle are assembled. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 、 Figure 2 As shown, the high-pressure inner liner of a blow-molded plastic bottle preform of the present invention includes an inner liner 1 blown from a plastic bottle preform 19 and a metal nozzle installed at the opening of the inner liner 1; the plastic bottle preform 19 can be a bottle preform injection-molded from PET, PC, PP or other polymer materials. The opening of the inner liner 1 is provided with an outward-folded flange 2, which is in a circular ring shape and fixedly connected to the uppermost end of the opening of the inner liner 1. The metal nozzle includes a locking block 3 and a metal valve block 4 coaxially installed at the opening of the inner liner 1, and the metal valve block 4 is used to connect the gas valve of the gas-using equipment; as shown Figure 4 、 Figure 5 As shown, the locking block 3 is an annular body with external threads. The inner ring diameter of the locking block 3 is adapted to the outer diameter of the opening of the inner liner 1, so that the locking block 3 can be exactly sleeved on the opening of the inner liner 1 and has a certain sealing performance. The upper end of the locking block 3 is provided with a slot 5 adapted to the flange 2, and the lower end is provided with a tool socket 6. The tool socket 6 is a cylindrical blind hole, which can also adopt an elliptical or polygonal column structure. The depth of the slot 5 is adapted to the thickness of the flange 2. When the locking block 3 is sleeved on the opening of the inner liner 1, the flange 2 is exactly embedded in the slot 5, and the upper end surface of the flange 2 is flush with the upper end surface of the locking block 3, and the two are located on the same plane.

[0031] As an embodiment of the present invention, Figure 1 、 Figure 2 As shown, the locking block 3 adopts a metal structure independent of the flange 2 and the plastic bottle preform 19, and has higher mechanical strength.

[0032] like Figure 8As shown, as another embodiment of the present invention, the locking block 3 and the flange 2 are integrated. In this embodiment, the locking block 3 is made of the same material as the flange 2 and the plastic preform 19, and is integrated with the flange 2. The locking block 3 and flange 2 can be produced simultaneously during the production of the plastic preform 19, or the plastic preform 19 with the flange 2 and the locking block 3 with external threads can be produced separately. The locking block 3 and flange 2 can then be assembled and integrated by welding them together using methods such as ultrasonic welding.

[0033] like Figure 6 、 Figure 7 As shown, the metal valve block 4 located at the upper end of the inner liner 1 is a tubular structure coaxially arranged with the opening of the inner liner 1. The lower end of the metal valve block 4 is fixedly connected with a spherical cap support portion 7. The spherical cap support portion 7 and the metal valve block 4 are an integrated structure. The thickness of the spherical cap support portion 7 gradually decreases from the inside to the outside, that is, the closer to the edge, the smaller the thickness of the spherical cap support portion 7. In actual use, because the metal valve block 4 is used to directly connect to external equipment and at the same time serve as the inlet and outlet channels for gas, the metal valve block 4 is subjected to the greatest pressure, and the spherical cap support portion 7 is subjected to the pressure transmitted by the metal valve block 4. The farther the edge of the spherical cap support portion 7 is from the metal valve block 4, the smaller the transmitted pressure it is subjected to. Reducing the thickness of the edge of the spherical cap support portion 7 will not only not reduce the overall structural strength, but also reduce weight and production costs.

[0034] The inner side surface of the spherical crown support portion 7 is provided with a mounting groove 8 for accommodating the locking block 3, and the side wall of the mounting groove 8 is provided with an internal mounting groove thread 9 that is adapted to the external thread of the locking block 3. During assembly, the locking block 3 is placed in the mounting groove 8, and the locking block 3 is rotated using a tool inserted into the tool socket 6, and the external thread on the locking block 3 is screwed into the internal mounting groove thread 9 until the upper end of the locking block 3 contacts the bottom of the mounting groove 8. In this embodiment, four tool sockets 6 are evenly distributed along the circumference of the lower end of the locking block 3. An assembly tool with 2-4 insertion rods on the handle can be used, and the insertion rods on the handle are correspondingly inserted into at least two tool sockets 6 of the locking block 3. Rotating the handle can drive the locking block 3 to rotate. Of course, as other embodiments of the present invention, two or three tool sockets 6 at the lower end of the locking block 3 can also be provided.

[0035] As a further improvement of the present invention, the lower end surface of the metal valve block 4 extends into the mounting groove 8, and the lower end surface of the metal valve block 4 is flush with the lower end surface of the mounting groove 8, and the outer diameter of the lower end of the metal valve block 4 located in the mounting groove 8 is adapted to the inner diameter of the opening of the inner tank 1. Figure 1 、 Figure 2As shown, both before and after blow molding, the lower end of the metal valve block 4 can extend into the interior of the plastic bottle preform 19 or the opening of the inner liner 1, supporting and sealing the bottle mouth. Furthermore, to further enhance the sealing performance at the bottle mouth, an O-ring 10 is provided at the junction of the bottom of the mounting groove 8 and the metal valve block 4. This O-ring 10 is fitted onto the metal valve block 4, located at the bottom of the mounting groove 8. After the metal nozzle is assembled with the plastic bottle preform or inner liner 1, this O-ring 10 surrounds the opening of the plastic bottle preform or inner liner 1, sealing the bottle mouth.

[0036] In addition, in order to facilitate the connection of the valve of the gas-consuming equipment, a valve block internal thread 12 is provided in the inner cavity of the metal valve block 4 .

[0037] The present invention provides a method for producing a high-pressure inner liner by blow molding a plastic bottle embryo, comprising the following steps: 1) Prepare a metal nozzle and a plastic bottle preform, wherein the opening of the plastic bottle preform 19 is provided with an outwardly folded flange 2, and the outer shape of the plastic bottle preform 19 is a cylindrical structure or a conical structure with a small outer diameter at the lower end and a large outer diameter at the upper end, so that a ring with an inner diameter adapted to the opening of the plastic bottle preform 19 can be inserted through the plastic bottle preform 19; the metal nozzle includes a locking block 3 and a metal valve block 4 coaxially mounted at the opening of the plastic bottle preform 19; the locking block 3 is a ring with an external thread, and the inner ring diameter of the locking block 3 is adapted to the outer diameter of the plastic bottle The outer diameter of the opening of the preform 19, the upper end of the locking block 3 is provided with a slot 5 adapted to the flange 2, and the lower end is provided with a tool socket 6, which is used to insert a locking tool to rotate the locking block 3; the metal valve block 4 is a tubular structure coaxially arranged with the opening of the plastic bottle preform 19, and the lower end of the metal valve block 4 is fixedly connected to a spherical crown support portion 7, the inner side surface of the spherical crown support portion 7 is provided with a mounting groove 8 for accommodating the locking block 3, and the side wall of the mounting groove 8 is provided with an internal mounting groove thread 9 adapted to the external thread of the locking block 3; 2) Align the metal valve block 4 with the opening of the plastic bottle preform 19 so that the upper end surface of the opening of the plastic bottle preform 19 contacts the bottom of the mounting groove 8. Insert the locking block 3 from the lower end of the plastic bottle preform into the opening of the plastic bottle preform so that the flange 2 is engaged with the locking groove 5. 3) Install the locking block 3 into the mounting groove 8 on the inner side of the spherical crown support portion 7, and tighten the locking block 3 with a locking tool until the upper end of the locking block 3 contacts the bottom of the mounting groove 8; 4) Place the plastic bottle preform 19 with the metal nozzle assembled into the preform baking equipment, and heat the plastic bottle preform according to the set temperature and time to soften the plastic bottle preform; 5) The heated plastic preform with the metal nozzle is placed into the blow molding mold. The blow molding equipment injects compressed air into the plastic preform through the metal valve block 4, causing the plastic preform to expand and adhere to the inner wall of the blow molding mold to form an inner liner 1; 6) Demolding and taking out the blow-molded liner; 7) Wrapping and winding a carbon fiber layer on the outer surface of the inner liner 1.

[0038] In addition, in order to improve the sealing effect, an O-ring 10 is embedded in the bottom surface of the mounting groove 8 of the metal valve block 4 prepared in step 1).

[0039] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A high-pressure inner liner blow-molded from a plastic bottle preform, comprising an inner liner (1) blown from a plastic bottle preform and a metal nozzle installed at the opening of the inner liner (1), wherein the opening of the inner liner (1) is provided with an outwardly folded flange (2), characterized in that: The metal pipe mouth comprises a locking block (3) and a metal valve block (4) coaxially mounted at the opening of the inner liner (1); the locking block (3) is an annular body with an external thread, the inner ring diameter of the locking block (3) is adapted to the outer diameter of the opening of the inner liner (1), the upper end of the locking block (3) is provided with a slot (5) adapted to the flange (2), and the lower end is provided with a tool socket (6); the metal valve block (4) is a tubular structure coaxially arranged with the opening of the inner liner (1), the lower end of the metal valve block (4) is fixedly connected to a spherical crown support portion (7), the inner side surface of the spherical crown support portion (7) is provided with a mounting groove (8) for accommodating the locking block (3), and the side wall of the mounting groove (8) is provided with an internal mounting groove thread (9) adapted to the external thread of the locking block (3).

2. A high-pressure inner liner for blow molding a plastic bottle preform according to claim 1, characterized in that: The lower end surface of the metal valve block (4) extends into the mounting groove (8), and the lower end surface of the metal valve block (4) is flush with the lower end surface of the mounting groove (8), and the outer diameter of the lower end of the metal valve block (4) located in the mounting groove (8) is adapted to the inner diameter of the opening of the inner tank (1).

3. The high-pressure inner liner for blow molding a plastic bottle preform according to claim 2, characterized in that: An O-shaped sealing ring (10) is provided at the junction between the bottom of the installation groove (8) and the metal valve block (4).

4. A high-pressure inner liner for blow molding a plastic bottle preform according to claim 1 or 2, characterized in that: A valve block internal thread (12) is provided in the inner cavity of the metal valve block (4).

5. A high-pressure inner liner for blow molding a plastic bottle preform according to claim 1 or 2, characterized in that: The thickness of the spherical cap support portion (7) gradually decreases from the inside to the outside.

6. A high-pressure inner liner for blow molding a plastic bottle preform according to claim 1 or 2, characterized in that: The locking block (3) and the flange (2) are an integrated structure.

7. A method for producing a high-pressure inner liner of a plastic bottle preform blow molding, characterized in that The steps include: 1) Prepare a metal nozzle and a plastic bottle preform, wherein the opening of the plastic bottle preform (19) is provided with an outwardly folded flange (2); the metal nozzle comprises a locking block (3) and a metal valve block (4) coaxially mounted at the opening of the plastic bottle preform (19); the locking block (3) is an annular body with an external thread, the inner ring diameter of the locking block (3) is adapted to the outer diameter of the opening of the plastic bottle preform (19), the upper end of the locking block (3) is provided with a slot (5) adapted to the flange (2), and the lower end is provided with a tool insertion hole (6); the metal valve block (4) is a tubular structure coaxially arranged with the opening of the plastic bottle preform (19), the lower end of the metal valve block (4) is fixedly connected with a spherical crown support portion (7), the inner side surface of the spherical crown support portion (7) is provided with a mounting groove (8) for accommodating the locking block (3), and the side wall of the mounting groove (8) is provided with an internal mounting groove thread (9) adapted to the external thread of the locking block (3); 2) docking the metal valve block (4) with the opening of the plastic bottle preform (19), so that the upper end surface of the opening of the plastic bottle preform (19) contacts the bottom of the mounting groove (8), inserting the locking block (3) from the lower end of the plastic bottle preform into the opening of the plastic bottle preform, so that the flange (2) is locked into the locking groove (5); 3) Install the locking block (3) into the mounting groove (8) on the inner side of the spherical crown support portion (7), and tighten the locking block (3) using a locking tool so that the upper end of the locking block (3) contacts the bottom of the mounting groove (8); 4) placing the plastic bottle embryo (19) assembled with the metal nozzle into the embryo baking equipment, heating the plastic bottle embryo according to the set temperature and time to soften the plastic bottle embryo; 5) placing the heated plastic bottle preform with the metal nozzle into the blow molding mold, and the blow molding equipment injects compressed air into the plastic bottle preform through the metal valve block (4), so that the plastic bottle preform expands and fits the inner wall of the blow molding mold to form an inner liner (1); 6) Demolding and taking out the blow-molded liner (1); 7) Wrapping and winding a carbon fiber layer on the outer surface of the inner liner (1).

8. The method for producing a high-pressure inner liner by blow molding a plastic bottle preform according to claim 7, characterized in that: In step 1), an O-shaped sealing ring (10) is embedded in the bottom surface of the mounting groove (8) of the prepared metal valve block (4).

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