TWI846347B - Manufacturing method of tire inner tube - Google Patents

Abstract

The manufacturing method of the present invention comprises the following steps: a) providing a sheet of material, the sheet being made of a thermoplastic elastomer material and having a central portion and two connecting portions connected to two sides of the central portion; b) rolling the sheet into a tube having two open ends and a joint formed by welding the connecting portions; and c) welding the open ends of the tube to form a ring-shaped tire inner tube. Thus, the manufacturing method of the present invention has high production flexibility and high efficiency and can effectively reduce inventory costs.

Description

Manufacturing method of tire inner tube

The present invention relates to a tire inner tube, and more particularly to a method for manufacturing a tire inner tube.

Taiwan Patent Publication No. 200934652 discloses a method for manufacturing a non-vulcanized inner tube and a molding die, which includes an inner tube blank and a molding die with an arc-shaped extrusion channel. The inner tube blank is extruded through the arc-shaped extrusion channel to form an arc-shaped inner tube tube, and a nozzle component is combined with the cylindrical tube wall of the inner tube tube. Then, two open ends of the inner tube tube are joined together to manufacture a non-vulcanized inner tube product.

Although the non-vulcanized inner tube product manufactured by the manufacturing method of the aforementioned public case has an excellent roundness, in order to make the inner tube product applicable to tires of different sizes, molds of different sizes must be prepared to manufacture inner tube products with different diameters, which will lead to the stockpiling of inner tube products or molds and improperly increase inventory costs.

In view of this, the main purpose of the present invention is to provide a method for manufacturing a tire inner tube, which has high production flexibility and high production efficiency, and does not require the stockpiling of molds or tire inner tubes of different sizes, thereby effectively reducing inventory costs.

To achieve the above-mentioned main purpose, the manufacturing method of the present invention includes the following steps: a) providing a sheet of material, which is made of thermoplastic elastomer material and has a central portion and two connecting portions connected to two sides of the central portion; b) rolling the sheet into a tube body, which has two open ends and a joint formed by welding the connecting portions; and c) welding the open ends of the tube body to form a ring-shaped tire inner tube.

By virtue of the above technical features, the manufacturing method of the present invention only needs to provide a sheet material first, then roll the sheet material into a tube body according to actual needs, and then weld two connecting parts and two open ends, so that tire inner tubes with various sizes (diameters) can be manufactured. Therefore, the manufacturing method of the present invention has high production flexibility and high production efficiency. Furthermore, since the sheet material is easier to store, compared with the conventional manufacturing method, there is no need to stock up molds of different sizes, and there will not be a situation where tire inner tubes of different sizes are manufactured too much, so it also has the advantage of being able to significantly reduce inventory costs.

In one embodiment of the present invention, each of the connecting portions of the sheet in step a) has an inner surface; in step b), the joint portion is formed by adhering and welding the inner surfaces of each of the connecting portions to each other and then cutting; the tube in step b) has an inner surface; in step c), the opening ends of the tube are welded by bending the opening ends toward the inner surface so that the opening ends are adhered to each other, welded, and then cut.

In the present invention, in step a), step b) or step c), the tube body is further formed with an air hole; in step c), a valve stem is fixed to the tire inner tube so that an axial hole of the valve stem is connected to the air hole.

In one embodiment of the present invention, in the step b), the tube body is further formed with a mounting hole, and a valve stem is passed through the mounting hole and fixed to the tube body; in the step c), the tire inner tube has an inner ring side to which the valve stem is fixed and an outer ring side opposite to the inner ring side.

In the present invention, each of the connecting portions of the sheet in step a) has an outer side relative to the central portion; in step b), the joint portion is a butt-jointed structure formed by the outer sides of the connecting portions butting against each other or a superimposed structure formed by the connecting portions overlapping each other.

In one embodiment of the present invention, the inner ring side or the outer ring side of the tire inner tube has the joint portion. Thus, when the inner ring side has the joint portion and the joint portion is a stacked structure, the thickness of the inner ring side can be increased, so that the valve stem can be more stably fixed to the joint portion. Alternatively, when the inner ring side has the joint portion and the joint portion is a butt joint structure, the tube wall of the tube body (i.e., the sidewall of the tire inner tube finally formed) can have the same thickness to withstand a considerable tire pressure. Alternatively, when the outer ring side has the joint portion and the joint portion is a superimposed structure, when the tire inner tube manufactured by the manufacturing method of the present invention is installed in a tire outer tube, the thickness of the outer ring side of the tire inner tube corresponding to the tread of the tire outer tube will be thicker, thereby improving the puncture resistance of the tire inner tube. Alternatively, when the outer ring side has the joint portion and the joint portion is a butt joint structure, the tube wall of the tube body (i.e., the sidewall of the tire inner tube finally formed) can have the same thickness to withstand a considerable tire pressure.

In the present invention, in the step a), the connecting portions of the sheet material may be respectively provided with a through hole; in the step b), when the joint portion is a stacked structure, the through holes correspond to each other and together form the mounting hole.

In the present invention, in the step a), a through hole may be opened in the central portion of the sheet; in the step b), the through hole forms the mounting hole and is located at an opposite side of the joint portion.

In the present invention, in the step b), when the joint portion is a butt-jointed structure, a through hole is opened on one opposite side of the joint portion to form the mounting hole; when the joint portion is a stacked structure, a through hole is opened on the joint portion or on one opposite side of the joint portion to form the mounting hole.

In the present invention, in the step a), the thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethane (TPU), thermoplastic polyamide (TPA), thermoplastic polyester elastomer (TPEE), thermoplastic vulcanizate (TPV), thermoplastic polyolefin (TPO), thermoplastic styrene (TPS), thermoplastic rubber (TPR), polyvinyl butyral (PVB) and mixtures thereof, so at least one or more thermoplastic elastomers can be selected according to needs. Since the thermoplastic elastomer does not need high temperature vulcanization or the addition of talcum powder to prevent adhesion during processing and manufacturing, the use of the thermoplastic elastomer also has the advantages of saving energy and reducing environmental pollution.

The detailed steps and features of the manufacturing method provided by the present invention will be described in detail in the subsequent implementation methods. However, those with ordinary knowledge in the field should understand that the detailed description and the specific embodiments listed for implementing the present invention are only used to illustrate the present invention and are not used to limit the scope of the patent application of the present invention.

In order to explain the technical features of the present invention in detail, the manufacturing method of the present invention is described below with the help of the drawings. It should be noted that the drawings of this case are only schematic diagrams for explaining the technical features of the present case and are not drawn according to the actual size and proportion. Please refer to Figure 1, which is a flow chart of the manufacturing method of the present invention.

The manufacturing method of the present invention first provides a sheet made of a thermoplastic elastomer material, the sheet having a central portion and two connecting portions connected to two sides of the central portion (step S1). Then, as shown in step S2, the sheet is rolled into a tube body, the tube body having two open ends and a joint formed by welding the two connecting portions. Finally, as shown in step S3, the two open ends of the tube body are welded to form a ring-shaped tire inner tube.

Thus, since the manufacturing method of the present invention only needs to manufacture the sheet material first, and then tire inner tubes with different diameters can be manufactured according to demand, the manufacturing method of the present invention has high production flexibility and high production efficiency. Moreover, compared with the conventional manufacturing method that requires stockpiling molds of different sizes or stockpiling tire inner tubes of different sizes, the manufacturing method of the present invention only needs to store the sheet material, so it also has the advantage of being able to significantly reduce inventory costs.

Please refer to FIG. 2 . In the manufacturing method provided in the first embodiment of the present invention, a sheet 1 made of a thermoplastic elastomer material is first provided. In this example, the width of the sheet 1 is much greater than the length of the sheet 1 , and the sheet 1 has a central portion 2 and two connecting portions 3 respectively connected to two opposite sides of the central portion 2 , each of the connecting portions 3 having an inner surface 3i. The thermoplastic elastomer may be thermoplastic polyurethane (TPU), thermoplastic polyamide (TPA), thermoplastic polyester elastomer (TPEE), thermoplastic vulcanized rubber (TPV), thermoplastic polyolefin (TPO), thermoplastic polystyrene elastomer (TPS), thermoplastic rubber (TPR), polyvinyl butyral (PVB) or a mixture of two or more of the foregoing. In actual application, the sheet 1 made of thermoplastic elastomer material can be first rolled and cut into multiple rolls with different widths (not shown) for storage, and then a roll with a suitable width is selected according to actual needs, and the sheet 1 of the required length is pulled out.

Afterwards, as shown in FIG. 2 , the inner surfaces 3i of the two connecting parts 3 of the sheet 1 are attached to each other, so that the sheet 1 is rolled into a tube 4, and then the two connecting parts 3 attached to each other are welded, and the redundant or uneven parts are cut off to form a joint 5 with a width of about 0.01 mm. In this way, the tube 4 has an inner surface 4i and two open ends 6. The welding can be performed by, but not limited to, high frequency welding, microwave welding, laser welding, ultrasonic welding or heat pressing, so that the two connecting parts 3 attached to each other are joined and fixed to each other to form a joint 5.

Thereafter, the open ends 6 of the tube body 4 are bent toward the inner surface 4i so that the open ends 6 adhere to each other, and then the two open ends 6 that adhere to each other are joined and fixed to each other by methods such as but not limited to high frequency welding, microwave welding, laser welding, ultrasonic welding or heat pressing. Finally, the redundant or uneven parts are cut off so that the part where the two open ends 6 are joined to each other has a width of about 0.01 mm, and finally a ring-shaped tire inner tube 7 is formed, and the tire inner tube 7 has an inner ring side 7a and an outer ring side 7b. Since the tube wall of the tube body 4 forms the sidewall of the tire inner tube 7, the sidewall thickness of the tire inner tube 7 is almost the same. Therefore, when the tire inner tube 7 is inflated, the sidewall of the entire tire inner tube 7 can withstand a considerable tire pressure, thereby preventing the tire inner tube 7 from bulging.

Furthermore, as shown in FIG. 2 and FIG. 3, the manufacturing method of the first embodiment of the present invention further includes the steps of forming an air hole h and fixing the air nozzle rod 30 to the tire inner tube 7. The step of forming the air hole, for example, can be to open an air hole in the central portion 2 of the sheet 1 shown in FIG. 2; or to open an air hole in the tube 4 shown in FIG. 2; or to open a half hole corresponding to each other at the two opening ends 6 of the tube 4 shown in FIG. 2, so that when the two opening ends 6 attached to each other are welded to form a ring-shaped tire inner tube 7, the two corresponding half holes form an air hole. Next, as shown in FIG. 3 , a valve stem 30 having a base 31 and a stem 32 connected and fixed to the base 31 is adhered to the inner ring side 7a of the tire inner tube 7 so that the axial hole 301 of the valve stem 30 and the air hole h are connected to each other and fixed to the tire inner tube 7. The base 31 of the valve stem 30 may be made of thermoplastic elastomer material, such as thermoplastic polyurethane (TPU), thermoplastic polyamide (TPA), thermoplastic polyester elastomer (TPEE), thermoplastic vulcanizate (TPV), thermoplastic polyolefin (TPO), thermoplastic polystyrene elastomer (TPS), thermoplastic rubber (TPR), polyvinyl butyral (PVB) or a mixture of two or more of the foregoing, by injection molding; the shaft 32 of the valve stem 30 may be a metal pipe such as a copper pipe or an aluminum pipe, or a pipe injection molded using the foregoing thermoplastic elastomer material.

During specific installation, the base 31 is first attached to the inner ring side 7a of the tire inner tube 7 so that the axle hole 301 and the air hole h are interconnected, and then the base 31 is fixed to the inner ring side 7a of the tire inner tube 7 by methods such as high frequency welding, microwave welding, laser welding, ultrasonic welding or hot pressing. When the tire inner tube 7 manufactured by the manufacturing method of this embodiment is installed between the tire outer tube 44 and the wheel frame 43, the inner ring side 7a where the valve stem 30 is fixed will correspond to the wheel frame 43, and the outer ring side 7b relative to the inner ring side 7a will correspond to the tread 441 of the tire outer tube 44 for contacting the ground. In addition, the step of fixing the valve stem 30 to the tire inner tube 7 may also be to pass the rod body 32 of the valve stem 30 through the air hole h so that the rod body 32 is exposed outside the tube body 4, and then fix the base 31 to the inner wall surface of the tube body 4 by means of high frequency welding, microwave welding, laser welding, ultrasonic welding or hot pressing.

According to the manufacturing method of the first embodiment of the present invention, since the sheet 1 is made of thermoplastic elastomer material, high-temperature vulcanization or addition of talcum powder to prevent adhesion is not required during processing. Compared with the conventional manufacturing method, it has the advantages of saving energy and reducing environmental pollution. Moreover, compared with the conventional tire inner tube made of traditional natural rubber or butyl rubber, it also has the advantages of good air retention and light weight.

Next, please refer to FIG. 4 , which shows a manufacturing method provided by the second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is that the length of the sheet 10 provided by the present embodiment is much greater than the width of the sheet 10. The sheet 10 has a central portion 11 and two connecting portions 12 respectively connected to two opposite sides of the central portion 11, and each of the connecting portions 12 has an outer side 121 relative to the central portion 11.

Afterwards, holes 13 are respectively opened at positions corresponding to the two connecting parts 12 of the sheet 10 horizontally, and then the sheet 10 is rolled into a tube 20 in such a way that the two connecting parts 12 overlap each other and the two through holes 13 face each other, and the two connecting parts 12 are welded so that the two connecting parts 12 overlap each other to form a stacked structure 201, forming a joint 21 of the tube 20. In this way, the tube 20 has two open ends 22 and a mounting hole 23 formed by two facing through holes 13. In this step, the tube 20 with different diameters can be obtained by changing the width of the overlap of the two connecting parts 12. In addition, the welding mentioned above can be performed by, but not limited to, high frequency welding, microwave welding, laser welding, ultrasonic welding or heat pressing, so that the two overlapping connection parts 12 are joined and fixed to form a joint part 21.

Thereafter, the valve stem 30 having the base 31 and the shaft 32 connected and fixed to the base 31 is fixed to the joint 21 of the tube body 20. In specific installation, the shaft 32 is first passed through the mounting hole 23 so that the shaft 32 is exposed to the tube body 20, and then the base 31 is fixed to the inner wall surface of the tube body 20 by means of, for example, high frequency welding, microwave welding, laser welding, ultrasonic welding or heat pressing. Alternatively, the base 31 of the valve stem 30 is attached to the outer wall surface of the tube body 20 so that the axial hole 301 of the valve stem 30 and the mounting hole 23 are connected to each other, and then the base 31 is fixed to the outer wall surface of the tube body 20 by means of, for example, high frequency welding, microwave welding, laser welding, ultrasonic welding or heat pressing, and the valve stem 30 is fixed to the tube body 20.

Finally, the two open ends 22 of the tube body 20 are butted together and joined to form a ring-shaped tire inner tube 40 by, but not limited to, high frequency welding, microwave welding, laser welding, ultrasonic welding or hot pressing. The tire inner tube 40 thus prepared has an inner ring side 41 to which the valve stem 30 is fixed and an outer ring side 42 opposite to the inner ring side 41, and the inner ring side 41 has the joint portion 21 of the tube body 20.

By using the manufacturing method of the second embodiment of the present invention, since the valve stem 30 is fixed to the joint portion 21 formed as the stacked structure 201, the bonding stability of the valve stem 30 of the manufactured tire inner tube 40 can be improved.

Next, please refer to FIG. 5 , which shows a manufacturing method provided by the third embodiment of the present invention. The main difference between the third embodiment and the second embodiment is that the through hole 13 is opened on the central portion 11 of the sheet 10 , and preferably, the through hole 13 is located at the horizontal center position of the central portion 11 . In this way, when the sheet 10 is rolled into the tube 20 and the two connecting portions 12 are welded so that the two connecting portions 12 overlap each other to form a stacked structure 201 to form a joint portion 21 of the tube 20, the mounting hole 23 formed by the perforation 13 can correspond to the joint portion 21, and when the two open ends 22 of the tube 20 are butted and welded to form a tire inner tube 40, the outer ring side 42 will have the joint portion 21 of the tube 20 formed into the stacked structure 201, thereby ensuring that the tire inner tube manufactured by the manufacturing method of this embodiment is When the tire 40 is installed between the tire outer tube 44 and the wheel frame 43 (as shown in FIG. 7 ), the inner ring side 41 on which the valve stem 30 is fixed will correspond to the wheel frame 43, and the outer ring side 42 relative to the inner ring side 41 will correspond to the tread 441 of the tire outer tube 44 for contacting the ground. When the valve stem 30 passes through the wheel frame 43, the joint 21 formed as the stacking structure 201 on the outer ring side 42 can correspond to the tread 441 of the tire outer tube 44, thereby improving the puncture resistance of the tire inner tube 40.

On the other hand, as shown in FIG5 , in this embodiment, after the sheet 10 is rolled into the tube body 20, the two outer sides 121 of the two connecting parts 12 can be butted and welded to form a butted structure 203 to form a joint part 21 of the tube body 20, and the mounting hole 23 formed by the perforation 13 can correspond to the joint part 21. In this way, the tube wall of the tube body 20 can have almost the same thickness. When the two open ends 22 of the tube body 20 are butted and welded to form a tire inner tube 40, since the tube wall of the tube body 20 forms the sidewall of the tire inner tube 40, the sidewall thickness of the tire inner tube 40 is almost the same. Therefore, when the tire inner tube 40 is inflated, the sidewall of the entire tire inner tube 40 can withstand a considerable tire pressure, thereby preventing the tire inner tube 40 from bulging. It should be noted that the butt joint structure 203 formed by the two outer sides 121 of the two connecting parts 12 butting against each other during actual manufacturing may be formed by the two outer sides 121 of the two connecting parts 12 butting against each other, or by the two connecting parts 12 overlapping with a width of about 0.1 mm at locations very close to their respective outer sides 121.

Please refer to FIG. 6 again, which is a manufacturing method provided by the fourth embodiment of the present invention. In this embodiment, the two connecting parts 12 of the sheet 10 are first overlapped to form a stacked structure 201 and welded to form a joint part 21, and then a through hole 13 is opened in the joint part 21 or the opposite side 24 of the joint part 21 to form a mounting hole 23. In this way, similar to the above-mentioned embodiment, when the valve stem 30 is fixed to the joint part 21 formed as the stacked structure 201 through the mounting hole 23, that is, when the joint part 21 is located at the inner ring side 41 of the tire inner tube 40, the valve stem 30 can be more stably fixed to the inner ring side 41, so that the bonding stability of the valve stem 30 of the tire inner tube 40 can be improved. Qualitative; when the valve stem 30 is fixed to the opposite side 24 of the joint 21 through the mounting hole 23, that is, when the joint 21 forming the stacked structure 201 is located on the outer rim side 42 of the tire inner tube 40, the thicker joint 21 can correspond to the tread 441 of the tire outer tube 44, thereby improving the puncture resistance of the tire inner tube 40.

Similarly, in this embodiment, the joint portion 21 may also be a joint structure 203 formed by mutually butting and welding the two outer sides 121 of the two connecting portions 12 of the sheet 10. At this time, considering the structural strength, the mounting hole 23 will be arranged on the opposite side 24 of the joint portion 21. In this way, the tube wall of the tube body 20 can have almost the same thickness. When the two open ends 22 of the tube body 20 are butted and welded to form the tire inner tube 40, since the tube wall of the tube body 20 forms the sidewall of the tire inner tube 40, the sidewall thickness of the tire inner tube 40 is almost the same. Therefore, when the tire inner tube 40 is inflated, the sidewall of the entire tire inner tube 40 can withstand a considerable tire pressure, thereby preventing the tire inner tube 40 from bulging.

Based on the technical features of the present invention, the sheet 10 in the manufacturing method of the present invention can have a thicker central portion 11 and two thinner connecting portions 12. Preferably, the thickness of the connecting portion 12 is about 1/2 of the thickness of the central portion 11. In this way, when the joint portion 21 is a stacked structure 201 formed by overlapping the two connecting portions 12, the thickness of the stacked structure 201 is exactly the same as the thickness of the central portion 11. The two open ends 22 of the tube body 20 are then welded together to form a tire inner tube 40. The tube wall of the tube body 20 forms the sidewall of the tire inner tube 40. As a result, since the sidewalls of the tire inner tube 40 have the same thickness, when the tire inner tube 40 is inflated, the sidewalls of the entire tire inner tube 40 can withstand a considerable tire pressure, thereby preventing the tire inner tube 40 from bulging.

In summary, since the manufacturing method of the present invention only needs to provide sheets 1 and 10 first, and then roll the sheet 1 into a tube 4 according to actual needs, and then weld the two connecting parts 3 attached to each other on the inner surface 3i and the two open ends 6 bent toward the inner surface 4i of the tube 4 and attached to each other, it is possible to produce tire inner tubes 7 with various sizes (diameters); or according to actual needs, roll the sheet 10 into a tube 20, and change the two openings 6 to obtain a tire inner tube 7 with various sizes (diameters). The overlapping width of the connecting portion 12 forms the joint portion 21 or the two outer sides 121 of the two connecting portions of the sheets 10 with different widths are butted against each other to form the joint portion 21, so that the tube body 20 with different diameters can be obtained, and then by welding the two connecting portions 12 and the two open ends 22, the tire inner tubes 40 with various sizes (diameters) can be manufactured, so the manufacturing method of the present invention has high production flexibility and high production efficiency. Furthermore, since the sheets 1, 10 are easier to store, compared with the conventional manufacturing method, there is no need to stockpile molds of different sizes, and there will be no situation where tire inner tubes 7, 40 of different sizes are manufactured too much, so it also has the advantage of being able to significantly reduce inventory costs.

The steps and features disclosed in the aforementioned embodiments of the present invention are merely illustrative and are not intended to limit the scope of the present invention. All substitutions or changes made without violating the spirit of the present invention are covered by the scope of the patent application of the present invention.

1: Sheet 2: Central part 3: Connecting part 3i: Inner surface 4: Tube 4i: Inner surface 5: Joint 6: Open end 7: Tire inner tube 7a: Inner ring side 7b: Outer ring side 10: Sheet 11: Central part 12: Joint 121: Outer side 13: Perforation 20: Tube 201: Overlap structure 203: Butt joint structure 21: Joint 22: Open end 23: Mounting hole 24: Opposite side 30: Valve stem 301: Shaft hole 31: Base 32: Shaft 40: Tire inner tube 41: Inner ring side 42: Outer ring side 43: wheel frame 44: tire cover 441: tread h: air hole S1-S3: steps

The following is a further explanation of the manufacturing method provided by the present invention with reference to the embodiments and drawings, wherein: Figure 1 is a flow chart of the manufacturing method of the present invention; Figure 2 is a schematic diagram of the manufacturing method according to the first embodiment of the present invention; Figure 3 is a three-dimensional schematic diagram of the tire inner tube manufactured according to the manufacturing method of the first embodiment of the present invention installed between the tire outer tube and the wheel frame. FIG4 is a schematic diagram of a manufacturing method according to the second embodiment of the present invention, showing that perforations are respectively opened in the connecting portion of the sheet, and when the joint portion is a superimposed structure, the mounting hole is set in the joint portion; FIG5 is similar to FIG4, and is a schematic diagram of a manufacturing method according to the third embodiment of the present invention, showing that perforations are opened in the central portion of the sheet, and when the joint portion is a joint structure or a superimposed structure, the mounting hole is set on the opposite side of the joint portion; FIG6 is a schematic diagram of a manufacturing method according to the fourth embodiment of the present invention, showing that after the joint portion is formed, perforations are opened in the joint portion or the opposite side of the joint portion to set the mounting hole in the joint portion or the opposite side of the joint portion; and FIG7 is a three-dimensional schematic diagram of a tire inner tube manufactured according to the manufacturing methods of the second, third and fourth embodiments of the present invention installed between a tire outer tube and a wheel frame.

S1-S3: Steps

Claims (8)

A method for manufacturing a tire inner tube comprises the following steps: a) providing a sheet of material, the sheet being made of a thermoplastic elastomer material and having a central portion and two connecting portions connected to two sides of the central portion, each of the connecting portions having an inner surface and an outer surface; b) rolling the sheet into a tube having two open ends and a joint portion formed by overlapping and welding the two connecting portions, the joint portion being composed of the inner surface of one of the two connecting portions being overlapped on the outer surface of the other of the two connecting portions; and c) welding the open ends of the tube to form a ring-shaped tire inner tube, the joint portions being distributed around the entire circumference of the tire inner tube. The manufacturing method as described in claim 1, wherein in step a), step b) or step c), the tube body is further formed with an air hole; in step c), a valve stem is fixed to the tire inner tube so that an axle hole of the valve stem is connected to the air hole. The manufacturing method as described in claim 1, wherein in step b), the tube body is further formed with a mounting hole, and a valve stem is passed through the mounting hole and fixed to the tube body; in step c), the tire inner tube has an inner ring side to which the valve stem is fixed and an outer ring side opposite to the inner ring side. The manufacturing method as described in claim 3, wherein the inner ring side or the outer ring side of the tire inner tube has the joint portion. The manufacturing method as described in claim 3, wherein in step a), each of the connecting portions of the sheet is provided with a perforation, and the perforations correspond to each other and together form the mounting hole. The manufacturing method as described in claim 3, wherein in step a), a through hole is opened in the central portion of the sheet; in step b), the through hole forms the mounting hole and is located on an opposite side of the joint. The manufacturing method as described in claim 3, wherein in the step b), a through hole is opened in the joint portion or on one of the opposite sides of the joint portion to form the mounting hole. A manufacturing method as described in any one of claims 1 to 7, wherein in step a), the thermoplastic elastomer material is selected from the group consisting of thermoplastic polyurethane (TPU), thermoplastic polyamide (TPA), thermoplastic polyether ester (TPEE), thermoplastic vulcanizate (TPV), thermoplastic polyolefin (TPO), thermoplastic polystyrene elastomer (TPS), thermoplastic rubber elastomer (TPR), polyvinyl butyral (PVB) and mixtures thereof.

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