JP2000247122A - Pneumatic tire and method for manufacturing pneumatic tire - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To produce a tire filled with a sealant with high quality. SOLUTION: A puncture-preventing sealant sealed with a sealing rubber sheet extending in a circumferential direction is arranged on a tire lumen surface inside a tread portion 2. The sealing rubber sheet 5 includes an adhesive portion 5a integrally bonded to the inner liner rubber 12 forming the tire inner surface i, and an adhesion-preventing sheet 13 provided between the adhesive portions 5a and having rubber releasing properties. A non-adhesion portion 5b which is interposed between the inner liner rubber 12 and the inner liner rubber 12 to prevent adhesion. In the non-adhesive portion 5b, the sealing agent 6 is sealed in a bag-shaped portion formed by the tire lumen surface i and the sealing rubber sheet 5, and the adhesion-preventing sheet 13 is formed by attaching a small-width adhesion-preventing tape 14, The side edges 14e are formed by spirally winding in the tire circumferential direction with overlapping portions 16 overlapping each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubeless pneumatic tire and a method for manufacturing a pneumatic tire capable of suppressing air leakage from a tread puncture caused by a stepping on a nail or the like.

[0002]

2. Description of the Related Art As one of means for preventing air leakage from a punctured part due to stepping on a nail or the like, as disclosed in JP-A-8-323875, for example, a tire is disclosed. A bag-like portion is formed between the inner liner rubber facing the inner cavity and a sealing rubber sheet attached to the inside thereof, and after vulcanization molding of the tire, a puncture sealant is injected into the bag-like portion such as a syringe or the like. A method of injecting by using a method has been proposed.

[0003] When the sealing rubber sheet and the inner liner rubber are overlapped with each other in the process of forming a green tire, the bag-like portion is formed of powder such as talc or the like while leaving both side portions on the inner surface of the sealing rubber sheet. A liquid release agent is applied in advance, and both sides of the sealing rubber sheet and the inner liner rubber are vulcanized and bonded at the time of vulcanization molding, so that only the applied portion of the release agent is peeled off. Is done.

However, in the case where the bag-shaped portion is formed by applying such a release agent, the release agent tends to be excessively applied during the application operation. As a result, it is difficult to stably form a bag-shaped portion having a required strength, for example, the bonding margin of the sealing rubber sheet itself becomes too small, resulting in poor bonding or insufficient bonding strength. In addition, the application of the release agent reduces the work efficiency during tire production, but also causes variations in the application thickness of the release agent, and sometimes a portion that does not peel off is partially formed in the bag-shaped portion. Also, problems such as non-uniform filling of the puncture sealant are likely to occur.

Accordingly, the present invention is capable of easily and stably forming a bag-shaped portion (non-adhered portion) having a sufficient adhesive strength, and is capable of producing a tire filled with a sealant with high yield. It is an object of the present invention to provide a method of manufacturing a pneumatic tire that can be produced well and efficiently.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a bead portion is provided via sidewall portions extending radially inward from both ends of a tread portion. A pneumatic tire having a toroidal shape and a sealant for preventing puncture sealed with a sealing rubber sheet extending in a circumferential direction on a tire cavity surface inside the tread portion, wherein the sealing rubber The sheet has an adhesive portion integrally bonded to the inner liner rubber forming the tire lumen surface, and a rubber-releasing anti-adhesive sheet provided between the adhesive portions and interposed between the tire lumen surface. And a non-adhesion portion in which adhesion to the inner liner rubber is prevented, and the sealing agent is sealed in a bag-shaped portion formed by the tire cavity surface and the sealing rubber sheet in the non-adhesion portion. Then Moni, the anti-adhesive sheet is characterized in that the small width deposition-preventing tapes of, formed by helically wound with respect to the tire circumferential direction have an overlapping portion that side edges overlap one another.

According to the second aspect of the invention, the tire is formed in a toroidal shape having a bead portion through sidewall portions extending inward in the radial direction from both ends of the tread portion, and is formed around the inner surface of the tire bore inside the tread portion. A method for manufacturing a pneumatic tire in which a sealant for preventing puncture sealed with a sealing rubber sheet extending in a direction is provided, wherein an injection hole for injecting the sealant into the sealing rubber sheet is provided. Forming a sealing rubber sheet, attaching the sealing rubber sheet onto a molding former, and attaching a small-width adhesive tape having rubber releasing properties to the side edges of the tape. By forming a helical winding in the tire circumferential direction with an overlapping portion, an adhesion-preventing sheet narrower than the sealing rubber sheet is formed at a position separated from the upper surface and both side edges of the sealing rubber sheet. Shizuku Spiral tape winding step of forming a sealing rubber sheet with a sealing rubber sheet; inner liner rubber sticking step of sticking an inner liner rubber to the upper surface of the sealing rubber sheet with the sealing sheet; To form a raw cover body by adding a tire base structural material including a carcass and a bead core to the raw cover body, and after vulcanizing the raw cover body, the adhesion-preventing sheet is interposed from the injection hole. The method is characterized by including an injection step of injecting a sealant into a non-adhesion portion between the inner liner rubber and the sealing rubber sheet, the adhesion of which is prevented.

Here, the "adhesive tape" is not particularly limited, but preferably has a small width of, for example, 10 to 30 mm.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a pneumatic tire and a method of manufacturing the same according to the present invention will be described below with reference to the drawings, taking a motorcycle tire as an example of a pneumatic tire. FIG. 1 illustrates a motorcycle tire (hereinafter, may be simply referred to as “tire”) 1.
Is formed in a toroidal shape having bead portions 4 provided at respective inner ends of sidewall portions 3 extending radially inward from both ends of the tread portion 2 and a tire cavity surface i inside the tread portion.
The sealing rubber sheet 5 extending in the circumferential direction seals the sealant 6 for preventing puncture.

The tire 1 is reinforced by a cord layer including a carcass 8 bridged between the bead portions 4 and a breaker 9 disposed radially outside the carcass 8 and inside the tread portion 2. The required tire strength and rigidity are provided. The bead portion 4 is provided with a bead apex rubber 11 having a triangular cross section extending radially outward from the bead core 10.

As the carcass 8, at least one carcass having a radial structure, a semi-radial structure in which carcass cords are arranged at an angle of 70 to 90 degrees with respect to a circumferential direction, or a bias structure in which carcass cords are arranged at an angle of 35 to 70 degrees. The ply 8a is used, and in this example, the ply 8a is composed of one carcass ply 8a.
An example is shown in which both ends are folded back around the bead core 10 and locked.

The breaker 9 is formed of one or more breaker plies 9a in which breaker cords are arranged at an angle of 0 to 70 degrees with respect to the circumferential direction. In this embodiment, the breaker 9 includes one breaker ply 9a. However, this breaker 9
It can be omitted depending on the required tire performance.

On the inner surface of the carcass 8, an inner liner rubber 12 and the sealing rubber sheet 5 radially inside the inner liner rubber 12 are sequentially arranged. The inner liner rubber 12
Butyl rubber, halogenated butyl rubber, butyl rubber having excellent gas impermeability, such as brominated butyl rubber, etc. can be used, for example, having a substantially uniform thickness of about 0.5 to 2.0 mm, 8 covers almost the entire area.

In the present embodiment, the sealing rubber sheet 5 is formed of a belt-like rubber sheet having a width of 80% or more of the inner region Y of the tread and extending continuously in the circumferential direction. An adhesive portion 5a is formed integrally with the inner liner rubber 12, for example, by vulcanization.
The width L0 of each bonding portion 5a is not particularly limited, but is, for example, 4.0 to 10.0 mm, more preferably 5.
It is desirable to set it to 0 to 7.0 mm. If the width L0 of the bonding portion 5a is smaller than 4.0 mm, the bonding strength tends to decrease relatively.
There is a tendency that the filling width of the sealing agent 6 is unnecessarily reduced. Note that the “tread inner region Y” means a region on the tire cavity surface sandwiched by normals N, N erected on the tread surface 2S at the tread edge Te.

The sealing rubber sheet 5 is not particularly limited, but preferably has a thickness of, for example, 0.5 to 2.0 mm. When the thickness is less than 0.5 mm, the strength is relatively insufficient, for example, the sealing effect of the sealing agent 6 is reduced, and it is difficult to uniformly apply the tire filling internal pressure to the sealing agent 6. It tends to be. Conversely, if the thickness of the sealing rubber sheet 5 exceeds 2.0 mm, an unnecessary increase in tire weight tends to occur. From such a viewpoint, the thickness of the sealing rubber sheet 5 is, for example, 1.0 to 1.0.
1.5 mm is particularly preferred.

As the sealing rubber sheet 5, a butyl rubber which is substantially the same as the inner liner rubber 12 is preferable, but other rubbers such as a brominated butyl rubber, a halogenated butyl rubber, and an inner rubber formed by heat of vulcanization are used. As long as the rubber composition can be bonded to the liner rubber 12, a compounded rubber obtained by mixing a diene rubber such as styrene / butadiene can be used.

Further, between the adhesive portions 5a, 5a formed on the both side edges of the sealing rubber sheet 5, an anti-adhesion sheet 13 is provided.
A non-adhesive portion 5b that is prevented from adhering to the inner liner rubber 12 is formed by the interposition of the inner liner rubber 12, and a non-adhesive portion 5b is formed in a bag-like portion between the inner liner rubber 12 and the sealing rubber sheet 5 formed by the non-adhesive portion 5b. The sealant 6 is sealed and kept airtight, for example. As shown in FIG. 2, the adhesion-preventing sheet 13 is a small-width adhesion-preventing tape 1.
One of the features is that 4 is formed by spirally winding in the tire circumferential direction with overlapping portions 16 whose side edges 14e overlap each other.

The advantages of forming the anti-adhesion sheet 13 by spirally winding the anti-adhesion tape 14 with a small width are as follows. First, as shown in FIG. 8 (A), when the anti-adhesion sheet 13 is formed of a wide sheet material having one rubber releasing property, the winding start end S1 of the anti-adhesion sheet and the winding end A lap joint j whose end S2 overlaps in the tire radial direction is provided and wound around the sealing rubber sheet 5 to form a tire raw cover. When such a green cover is vulcanized, the adhesion-preventing sheet 1 is subjected to expansion deformation during vulcanization.
No. 3 usually has no tackiness and has a smaller elongation ratio than rubber, so that as shown in FIG. Occurs.

At this time, the winding start end S1 of the adhesion-preventing sheet 13
The sealing rubber sheet 5 and the sealing rubber sheet 5 are pressed by the pressure at the time of vulcanization and are in close contact with each other, so that the sliding movement of the winding start end S1 and the portion of the sealing rubber sheet 5 in close contact with the winding start end S1 Is locally subjected to a large tensile force in the tire circumferential direction, and a concave portion D or the like in which the thickness of the sealing rubber sheet is locally and excessively reduced is formed, and the sealing rubber sheet 5 is torn. There is a problem that causes the above.

On the other hand, in the present invention, the adhesion-preventing sheet 13 has a small-width adhesion tape 14 and, as shown in FIGS. 2 and 4, an overlapping portion 16 whose side edges 14e overlap each other. As a result, the specific overlapping spliced portion j as described above is not formed as the anti-adhesive sheet 13. Therefore, it is possible to suppress a large slip between the adhesion-preventing sheets and the like which have occurred at the lap joint portion, and to expand the adhesion-preventing tape 14 as a whole to cope with the expansion deformation, so that the sealing rubber sheet 5
Can be effectively prevented from being non-uniform or broken.

The adhesion tape 14 is not particularly limited, but is preferably a ribbon having a small width of, for example, 10 to 30 mm. Further, the overlapping portion 16
If the amount of overlap is too small, the side edge 14e
The non-adhesive portions 5b are not effectively formed, and the filling of the sealant 6 tends to be uneven.
From such a point of view, at the time of manufacturing the tire, preferably by providing an overlapping portion having an overlapping amount of 3 mm or more, more preferably 5 to 10 mm, the side edge 14e of the adhesion-preventing tape 14 is not separated after molding. It is desirable to be.

The anti-adhesion sheet 13 formed by the spiral winding of the anti-adhesion tape 14 is, for example, a band-like body continuous in the circumferential direction of the tire which is about 8 to 20 mm narrower than the sealing rubber sheet 5. Make Further, in this example, since the adhesion-preventing tape 14 is made of a polymer film having rubber-releasing properties, the adhesion-preventing sheet 13 also has rubber-releasing properties.

Here, it is particularly preferable that the anti-adhesion tape 14 has an elongation property capable of expanding and deforming together with the surrounding rubber during green tire molding and vulcanization molding. For this purpose, although not particularly limited, for example, those having an elongation of 20% or more for a load of 400 g per 8 mm of tape width are particularly preferable.

As such an adhesion-preventing tape 14, for example, a polyfluoroethylene resin which is Teflon (trademark of DuPont) is preferable, and its thickness is 0.05 mm to 0.1 mm.
A required and sufficient elongation performance can be obtained by setting the thickness to about 5 mm, for example, about 0.1 mm. Further, instead of such a polyfluoroethylene resin, for example, a nylon film or the like can be used as an inexpensive material for the adhesion preventing tape 14. As the nylon film, for example, a film mainly made of nylon 6 (trade name “Reifan N”)
O ", manufactured by Toray Synthetic Film Co., Ltd.) is particularly preferred from the viewpoint of elongation performance and rubber release properties. Table 1 shows the physical properties of such a nylon film.

[0025]

[Table 1]

As a result of various experiments by the inventors, when such a nylon film is used as an anti-adhesion sheet, good anti-adhesion properties and elongation performance are exhibited even if its thickness is, for example, about 25 μm. That has been confirmed. In addition, the anti-adhesion tape 14 is not limited to these examples, for example, a polyethylene film or the like impregnated with a rubber release agent, a rubber release surface treated, or the like.
It goes without saying that various materials can be used.

The sealant 6 to be filled in the bag-like portion.
For example, a viscous material exhibiting a liquid state at normal temperature (20 ° C.), for example, having a viscosity of 2.0 to 10.0 mPa · s (temperature 20 ° C.) can be suitably used. Besides this,
Various liquid puncture sealants can be used as long as they can seal a nail hole in a temperature range of -20 ° C to 60 ° C.

Next, an example of a method for manufacturing such a pneumatic tire 1 will be described. The manufacturing method of the present embodiment includes a sheet punching step, an attaching step, a spiral winding step of an anti-adhesive tape, an inner liner rubber attaching step, a raw cover body forming step, and a pouring step.

In the sheet punching step, the sealing rubber sheet 5 cut into a predetermined width and a predetermined length as shown in FIG.
Alternatively, an injection hole 15 for injecting the sealing agent 6 is provided in the sealing rubber sheet 5 being cut to form a sealing rubber sheet 5A with holes. In the present embodiment, the injection hole 15 having a diameter of 2 to 8 mm is formed in the center portion of the sealing rubber sheet 5 in the width direction.

In addition, the mounting step is as shown in FIG.
As schematically shown in (B), the sealing rubber sheet 5A is wound and adhered on the cylindrical molding former 20 and at a position corresponding to the tread inner region Y.

The step of spirally winding the adhesion-preventing tape is performed as shown in FIG.
As schematically shown in (A) and (B), the adhesive tape 14 having a rubber releasing property and having a small width is provided with an overlapping portion 16 in which the side edges 14e of the adhesive tape 14 overlap with each other in the tire circumferential direction. By spirally winding, an adhesion-preventing sheet 13 narrower than the sealing rubber sheet 5A is formed at a position separated from the upper surface and both side edges of the sealing rubber sheet 5A by equal distances LO and LO in this example, thereby preventing the sealing rubber sheet 5A. The sealing rubber sheet 5B with the attachment sheet is formed. As described above, in the present invention, the step of conventionally applying the release agent one by one can be replaced by a simple operation of spirally winding the small-sized adhesion tape 14 and affixing it to the sealing rubber sheet 5. .

The anti-adhesive tape 14 can be formed, for example, by forming the winding start end and the winding end end in an oblique shape in advance so that the anti-adhesion tape 13 does not sag or wrinkle. Can be spirally wound with small leads while aligning the side edges of the tire in the tire circumferential direction. At this time, it is possible to accurately control the dimensions of the bonded portion and the non-bonded portion. The angle of the adhesion tape 14 with respect to the tire circumferential direction is preferably, for example, 3 ° or less.

Further, the step of attaching the inner liner rubber includes:
As schematically shown in FIG. 5, an inner liner rubber 12 is adhered to the upper surface of the sealing rubber sheet 5B with the adhesion preventing sheet. Further, as shown in FIG. 6, the raw cover body forming step includes a tire base structural member 21 including a carcass ply 8 a and a bead core 10 on the inner liner rubber 12.
Is added, and the raw cover body 1A is formed by, for example, expanding the diameter by the molding former 20. In this example, the tire base structural member 21 further includes a bead apex rubber 11, a breaker ply 9a, a tread rubber 2G, a side wall rubber 3G, and the like. Is performed.

In the pouring step, as shown in FIG. 7, after the raw cover 1A is vulcanized,
This is a step of injecting the sealant 6 into the non-adhered portion 5b between the inner liner rubber 12 and the sealing rubber sheet 5 whose adhesion has been prevented by the adhesion-preventing sheet 13. This injection is performed by injecting a prescribed amount using a syringe-shaped injector, whereby a layer of the sealant swelling to a predetermined thickness is formed as shown in FIGS. The injection hole 15 after the injection
In this example, is sealed appropriately with an unvulcanized or vulcanized rubber sheet coated with an adhesive.

As described above, in the method of manufacturing a pneumatic tire according to the present embodiment, instead of applying a release agent, an anti-adhesion sheet 13 formed by spirally winding an anti-adhesion tape 14 having a small width is used as a sealing rubber. Since it is provided on the sheet 5, the work efficiency is excellent, and the width L0 of the bonding portions 5a at both ends can be managed with high accuracy. As a result, the adhesive strength of the bag-like portion can be increased and stabilized, and the width of the non-adhesive portion 5b, that is, the volume of the bag-like portion into which the sealant 6 is injected does not vary, and the thickness of the layer of the sealant 6 can be reduced. Can be obtained.

The anti-adhesion sheet is a small-width anti-adhesion tape 14.
Therefore, a specific overlapping portion is not formed as the anti-adhesion sheet 13.
Accordingly, the thickness of the sealing rubber sheet 5 can be prevented, such as preventing large slippage of the anti-adhesive sheet, which is likely to occur at the lap joint portion, and expanding the anti-adhesive tape 14 entirely and uniformly to cope with expansion deformation. Can be effectively prevented.

Further, in the manufacturing method of the present invention, the peeling failure caused by the uneven coating of the conventional release agent can be effectively suppressed. Also, when inserting the sealant 6 by inserting the tip of the injector,
Injection holes 15 are provided in the sealing rubber sheet 5 in advance, and the anti-adhesion sheet 13 protects the inner liner rubber 12, so that the risk of causing a puncture in the inner liner rubber 12 is eliminated. Thus, high-quality tires can be produced with high yield and efficiency.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Tire size 3.0, which has the basic structure of FIG.
A motorcycle tire of 0-10 was prototyped using the above-described manufacturing method, and the method of forming the anti-adhesion sheet was as shown in Table 2, and the sealing rubber sheet was broken during vulcanization, and after the tire was formed, Air was injected into the bag-shaped portion to check the molding accuracy and the like visually. The carcass was formed of two carcass plies in which nylon cords having a cord fineness of 840 dtex / 2 were arranged at an angle of 42 ° to the tire equator and turned around the bead core, and the breaker was omitted. . Table 2 shows the test results.

[0039]

[Table 2]

As shown in Table 2, the spiral-wound anti-adhesion tape provided a highly accurate pneumatic tire without breakage of the sealing rubber sheet in any case. In the case of using one of the above, the sealing rubber sheet was torn.

[0041]

As described above, according to the first aspect of the present invention, the sealing rubber sheet for sealing the sealant is provided with an adhesive portion integrally bonded to the inner liner rubber and a rubber between the adhesive portion. A non-adhesive portion in which adhesion to the inner liner rubber is prevented by the interposition of an adhesion-preventing sheet having releasability, and a bag-like shape between the inner liner rubber and the sealing rubber sheet formed by the non-adhesive portion By sealing the sealant in the portion, it is possible to eliminate a variation in the volume of the bag-like portion into which the sealant is injected, and obtain a highly accurate pneumatic tire having a uniform thickness of the sealant layer. .

[0042] Further, since the above-mentioned adhesion-preventing sheet is formed by spirally winding a small-width adhesion-preventing tape in the tire circumferential direction so as to have an overlapping portion whose side edges overlap each other, As a result, a specific overlapping portion is not formed. Therefore, it is possible to effectively suppress large slippage between the adhesion-preventing sheets, which is likely to occur at the spliced portion of the adhesion-preventing sheet, and to expand the adhesion-preventing tape as a whole and uniformly, thereby expanding and deforming during vulcanization. Such as
It is possible to effectively prevent the thickness of the sealing rubber sheet from becoming non-uniform or from being broken due to thinning.

According to the second aspect of the present invention, since the anti-adhesion sheet is attached to the sealing rubber sheet instead of applying the release agent, the work efficiency is excellent, and the width of the bonding portion at both ends of the sealing rubber sheet is excellent. As a result, the bonding strength of the bag-shaped portion can be increased and stabilized, and the width of the non-bonded portion, that is, the volume of the bag-shaped portion into which the sealing agent is injected is not varied. A pneumatic tire having a uniform thickness of the sealant layer can be easily manufactured. The above-mentioned anti-adhesion sheet includes an anti-adhesion tape spiral winding step in which the anti-adhesion tape is formed by spirally winding a small-width anti-adhesion tape in a circumferential direction of the tire with overlapping portions having side edges overlapping each other. For this reason, a specific overlap splicing portion is not formed as the adhesion preventing sheet, and large slippage between the adhesion preventing sheets, which tends to occur at the overlapping splicing portion of the adhesion preventing sheet, can be effectively suppressed. As a result, the thickness of the sealing rubber sheet becomes non-uniform, such as being able to cope with expansion deformation during vulcanization by stretching the anti-adhesion tape entirely and uniformly, and tearing due to thinning occurs. A pneumatic tire that can effectively prevent the occurrence of a pneumatic tire can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pneumatic tire according to the present invention.

FIG. 2 is an enlarged sectional view of the tread portion.

FIG. 3 is a schematic view illustrating a sheet punching step.

FIGS. 4A and 4B are views for explaining an attaching step and a spiral winding step of an adhesion-preventing tape, wherein FIG. 4A is a schematic plan view, and FIG.

FIG. 5 is a schematic sectional view illustrating an inner liner rubber attaching step.

FIG. 6 is a schematic sectional view illustrating a raw cover body forming step.

FIG. 7 is a schematic view illustrating an injection step.

FIGS. 8A and 8B are partial cross-sectional views in the tire circumferential direction for explaining slippage of an adhesion-preventing sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tire 1A Raw cover body 5 Sealing rubber sheet 5b Non-adhesive part 6 Sealing agent 8 Carcass 10 Bead core 12 Inner liner rubber 13 Protective sheet 14 Protective tape 14e Side edge of protective tape 15 Injection hole 16 Overlap of protective tape Part 20 Molding former

Claims (2)

[Claims] 1. A seal having a toroidal shape provided with a bead portion through sidewall portions extending radially inward from both ends of a tread portion and extending circumferentially on a tire cavity surface inside the tread portion. A pneumatic tire provided with a sealant for preventing puncture sealed with a rubber sheet, wherein the sealing rubber sheet is integrally bonded to an inner liner rubber forming a tire inner cavity surface, and the bonding portion And a non-adhesion portion, which is provided between the inner liner rubber and an adhesion preventing sheet having a rubber releasing property and interposed between the inner liner rubber and the inner surface of the tire, is provided. In a portion, the sealing agent is sealed in a bag-shaped portion formed by the tire cavity surface and the sealing rubber sheet, and the adhesion-preventing sheet overlaps a small-width adhesion tape with its side edges overlapping each other. The have pneumatic tire characterized by being formed by helically wound with respect to the tire circumferential direction. 2. A seal having a toroidal shape provided with a bead portion through sidewall portions extending radially inward from both ends of the tread portion, and extending circumferentially on a tire cavity surface inside the tread portion. A method for manufacturing a pneumatic tire in which a sealant for preventing puncture sealed with a rubber sheet is provided, wherein an injection hole for injecting the sealant into the seal rubber sheet is provided, and a sealing rubber sheet with holes is provided. Forming a sheet, forming the sheet, attaching the sealing rubber sheet onto a molding former, forming a rubber-releasable and small-width anti-adhesive tape having an overlapping portion whose side edges overlap each other. A sealing sheet having a width smaller than that of the sealing rubber sheet is formed at a position separated from the upper surface and both side edges of the sealing rubber sheet by spirally winding the sealing rubber sheet in the circumferential direction of the tire. Stop rubber sheet Forming an inner liner rubber on the upper surface of the sealing rubber sheet provided with the anti-adhesion sheet, a tire including a carcass and a bead core on the inner liner rubber. A raw cover body forming step of adding a base structural material to form a raw cover body, and after vulcanizing the raw cover body, the adhesion is prevented from the injection hole by the interposition of the anti-adhesive sheet. A method for manufacturing a pneumatic tire, comprising an injection step of injecting a sealant into a non-adhesive portion between an inner liner rubber and a sealing rubber sheet.