JP7575655B2 - Method and apparatus for manufacturing pneumatic tires - Google Patents

Description

The present invention relates to a method and device for manufacturing pneumatic tires, and more specifically, to a method and device for manufacturing pneumatic tires that can more stably and quickly manufacture pneumatic tires that have a sound absorbing layer with a sealant layer of a specified width interposed in a specified area of the inner surface of the tire.

To prevent punctures in pneumatic tires, tires with a sealant layer on the inner surface of the tire are known. The sealant material that forms the sealant layer automatically seals any punctures that occur, preventing air from leaking out of the tire. A tire has been proposed that has a sound-absorbing layer on the inner side of such a sealant layer (see Patent Document 1).

In Patent Document 1, when forming the sealant layer, the sealant material is discharged from a nozzle while rotating the tire, and the sealant layer is formed by continuously applying the string-like sealant material in a spiral shape to the inner surface of the tire. Then, a sound-absorbing material is laminated on the inner surface of the sealant layer to form the sound-absorbing layer. The sealant material functions as a bonding agent that bonds the sound-absorbing layer to the inner surface of the tire.

However, in order to form a sealant layer in a predetermined area on the inner surface of the tire, it is necessary to wrap the string-shaped sealant material around the inner surface of the tire in a number of times in the circumferential direction of the tire (paragraph 0098 of Patent Document 1). As a result, it takes a considerable amount of time to form the sealant layer. In addition, since the formed sealant layer is in a state in which the string-shaped sealant material is arranged in parallel in the width direction, the thickness of the sealant layer in the width direction is likely to vary. As a result, it is also disadvantageous to stably bond the sound absorbing layer to the inner surface of the tire. Therefore, there is room for improvement in more stable and rapid production of pneumatic tires that have a sound absorbing layer with a sealant layer of a predetermined width interposed in a predetermined area on the inner surface of the tire.

Patent No. 6184523

The object of the present invention is to provide a method and apparatus for more reliably and quickly producing pneumatic tires with a sound absorbing layer and a sealant layer of a specified width interposed in a specified area of the tire's inner surface.

In order to achieve the above object, the manufacturing method of a pneumatic tire of the present invention is a manufacturing method of a pneumatic tire in which a sound-absorbing layer is provided in a predetermined area of the vulcanized inner surface of the tire with a sealant layer of a predetermined width interposed therebetween, characterized in that a head having a recess of a predetermined shape and width in cross section is positioned so that the recess covers the inner surface of the tire in the predetermined area, a space surrounded by the recess and the inner surface of the tire facing the recess is used as a cavity, and a sealant material is filled into the cavity to form the sealant layer on the inner surface of the tire, the head is positioned cylindrically so that the entire inner surface of the tire in the predetermined area that extends continuously around the entire circumferential direction of the tire is covered by the recess, and a sound-absorbing material is laminated on the inner side of the formed sealant layer to form the sound-absorbing layer.
Another manufacturing method for a pneumatic tire of the present invention is a manufacturing method for a pneumatic tire in which a sound-absorbing layer is provided in a predetermined area of the vulcanized inner surface of the tire, with a sealant layer of a predetermined width interposed therebetween, characterized in that a head having a recess of a predetermined shape and width in a cross section is arranged so that the recess covers the inner surface of the tire in the predetermined area, a space surrounded by the recess and the inner surface of the tire facing the recess is used as a cavity, and a sealant material is filled into the cavity to form the sealant layer on the inner surface of the tire, the head is arranged so that the recess covers the inner surface of the tire in a portion of the circumferential direction of the predetermined area that extends continuously around the entire circumferential direction of the tire, and a filling step of filling the cavity with the sealant material is performed at positions where the head is sequentially shifted in the circumferential direction of the tire, and a sound-absorbing material is laminated on the inner side of the formed sealant layer to form a sound-absorbing layer.

The pneumatic tire manufacturing apparatus of the present invention has a sealant supplying means and a sound-absorbing material attaching means, and the sound-absorbing material is installed by the sound-absorbing material attaching means to form a sound-absorbing layer in a predetermined range of the inner surface of a vulcanized tire through a sealant layer of a predetermined width formed by a sealant material supplied from the sealant supplying means, and the pneumatic tire manufacturing apparatus comprises a head having a recess of a predetermined shape and of the predetermined width in a cross-sectional view, a supply pipe that communicates between the sealant supplying means and the head, and a setting mechanism that positions the head so that the inner surface of the tire in the predetermined range is covered by the recess. Furthermore, the head is arranged cylindrically by the setting mechanism so that the entire tire inner surface within the specified range extending continuously around the entire tire circumferential direction is covered by the recess, a space surrounded by the recess of the head arranged by the setting mechanism and the tire inner surface facing the recess becomes a cavity, the sealant layer is formed by filling the cavity with the sealant material, and the sound-absorbing layer is formed by stacking the sound-absorbing material on the inner side of the formed sealant layer by the sound-absorbing material attachment means.
Another pneumatic tire manufacturing apparatus of the present invention has a sealant supplying means and a sound-absorbing material attaching means, and the sound-absorbing material is installed by the sound-absorbing material attaching means in a predetermined range of the vulcanized inner surface of the tire via a sealant layer of a predetermined width formed by the sealant material supplied from the sealant supplying means to form a sound-absorbing layer. The pneumatic tire manufacturing apparatus further comprises a head having a recess of a predetermined shape and of the predetermined width in a cross-sectional view, a supply pipe that connects the sealant supplying means and the head, and a setting mechanism that positions the head so that the tire inner surface in the predetermined range is covered by the recess, and the sound-absorbing material attaching means attaches a sound-absorbing material to the predetermined range of the vulcanized inner surface of the tire, the sound-absorbing material attaching means attaching a sound-absorbing layer to the predetermined range of the vulcanized inner surface of the tire, the supply pipe communicating the sealant supplying means and the head, and the sound-absorbing material attaching means attaches a sound-absorbing material to the predetermined range of the vulcanized inner surface of the tire. the head is positioned by the setting mechanism so that a portion of the tire inner surface in a circumferential direction is covered by the recess, a space surrounded by the recess of the head positioned by the setting mechanism and the tire inner surface facing the recess becomes a cavity, the sealant layer is formed by filling the cavity with the sealant material, the filling process of filling the cavity with the sealant material is performed by positioning the heads in positions successively shifted in the tire circumferential direction, and the sound-absorbing layer is formed by stacking the sound-absorbing material by the sound-absorbing material attachment means on the inner side of the formed sealant layer.

According to the present invention, the cavity is constructed by positioning the head so that the tire inner surface in the specified range is covered by the recess of the specified width, and the sealant layer of the specified width is formed by filling the cavity with the sealant material. Therefore, the sealant layer of the specified width is formed all at once in the width direction. Therefore, it is not necessary to form the sealant layer by wrapping and extending the string-shaped sealant material multiple times in the tire circumferential direction along the tire inner surface, and the sealant layer of the specified width can be formed quickly. As a result, it is advantageous to quickly manufacture pneumatic tires equipped with a sound absorbing layer with a sealant layer of the specified width interposed therebetween.

In addition, the thickness of the formed sealant layer in the width direction is less likely to vary, which is advantageous for stably forming a sealant layer of the desired specifications. As a result, the sound-absorbing layer formed on the inner periphery of the sealant layer is also stable, which is advantageous for stably manufacturing pneumatic tires that have a sound-absorbing layer with a sealant layer of a specified width interposed therebetween.

1 is an explanatory diagram illustrating an outline of a manufacturing apparatus for a pneumatic tire according to the present invention; 2 is a cross-sectional view illustrating the periphery of the head in FIG. 1 as viewed from the front. 3 is an explanatory diagram illustrating the head periphery in FIG. 2 as viewed from the side; FIG. 4 is a cross-sectional view illustrating a state in which a head is inserted into a tire as viewed from the side. FIG. FIG. 5 is an explanatory diagram illustrating the inside of the tire of FIG. 4 in cross section. 5 is a cross-sectional view illustrating a state in which the head of FIG. 4 is set in contact with the inner surface of a tire, as viewed from the side. FIG. FIG. 7 is an explanatory diagram illustrating the inside of the tire of FIG. 6 in cross section. 8 is an explanatory diagram illustrating a state in which the cavity in FIG. 7 is filled with a sealant material. FIG. 1 is a cross-sectional view illustrating a tire on which a sealant layer is formed, as viewed from the side. 10 is a cross-sectional view illustrating a state in which a sound-absorbing material is placed on the inner peripheral surface of a sealant layer as viewed from the side. FIG. 1 is a cross-sectional view illustrating a tire on which a sound absorbing layer is formed, as viewed from the side. 12 is an explanatory diagram illustrating the butt joint position of the front end and rear end of the sound-absorbing material in a plan view. FIG. 13 is an explanatory diagram illustrating the periphery of a head of another embodiment of a manufacturing apparatus as viewed from the side; FIG. 14 is a cross-sectional view illustrating a state in which the head of FIG. 13 is set in contact with the inner surface of the tire, as viewed from the side. FIG. FIG. 15 is an explanatory diagram illustrating the inside of the tire of FIG. 14 in cross section. 16 is an explanatory diagram illustrating a state in which the cavity in FIG. 15 is filled with a sealant material. FIG. 15 is a cross-sectional view illustrating a state in which the head of FIG. 14 is set in contact with the inner surface of the tire at a position shifted in the tire circumferential direction, as viewed from the side. FIG. 1 is an explanatory diagram illustrating, in a plan view, the positional relationship between the joining positions of the sealant material and the butting positions of the sound-absorbing material. FIG.

The method and device for manufacturing a pneumatic tire of the present invention will be described below based on the embodiment shown in the figures.

By using the pneumatic tire manufacturing apparatus 1 of the present invention illustrated in Figures 1 to 3, a sealant layer SL of a predetermined width W is formed in a predetermined area on the tire inner surface Ta of the vulcanized pneumatic tire T1, and a sound absorbing layer PL is formed on the inner peripheral side of this sealant layer SL. In other words, by using the manufacturing apparatus 1, a pneumatic tire T2 is manufactured that is provided with a sound absorbing layer PL with a sealant layer SL interposed therebetween.

This manufacturing device 1 includes a sealant supply means 2, a head 5, a supply pipe 6 that connects the sealant supply means 2 and the head 5, a setting mechanism 6b that sets the head 6 at a desired position on the tire inner surface Ta, a holding mechanism 7, a sound-absorbing material attachment means 8, and a control unit 11. The control unit 11 controls the operation of each component of the manufacturing device 1.

The sealant supply means 2 supplies the sealant material S to the head 5 through the supply pipe 6. The sealant material S has a high viscosity at room temperature and does not flow easily. Various known sealant materials S (e.g., butyl rubber-based sealant material S) used to prevent tire punctures can be used.

In this embodiment, a plunger-type injection molding machine in which an extruder 3 and a plunger 4 are connected in series is used as the sealant supplying means 2. A screw 3b is provided inside the cylinder 3a that constitutes the extruder 3. A piston portion 4b that moves back and forth is provided inside the cylinder 4a that constitutes the plunger 4. A supply pipe 6 is connected to the discharge port of the plunger 4.

The head 5 is formed, for example, from metal, and has a recess 5a of a predetermined shape and a predetermined width W in cross section as shown in FIG. 2. This predetermined width W is substantially the same as the width of the sealant layer SL to be formed. In this embodiment, multiple heads 5 are provided, and as shown in FIG. 3, each head 5 has an arc shape in side view. When adjacent heads 5 are connected in the circumferential direction and the heads 5 are arranged in a cylindrical shape, the recesses 5a of all heads 5 are connected in the circumferential direction.

The supply pipe 6 has one axial tube 6a extending from the plunger 4, and multiple radial tubes 6b branching out and extending radially from the axial tube 6a. A head 5 is connected to the tip of each radial tube 6b. Each radial tube 6b has a telescopic structure and can be extended and retracted. These telescopic radial tubes 6b function as a setting mechanism. The dashed line CL in the figure indicates the axis of the axial tube 6a.

The configuration of the holding mechanism 7 is not limited as long as it can hold the tire T1 in a predetermined state. In this embodiment, the holding mechanism 7 has a rotating roller 7a, a base 7b, and a support part 7c erected on the base 7b. Four rotating rollers 7a are rotatably supported on the support part 7c. The holding mechanism 7 can slide in the direction of the axis CL.

The sound-absorbing material attachment means 8 can employ various mechanisms as long as it can laminate the sound-absorbing material P on the inner circumferential side of the sealant layer SL formed on the tire inner surface Ta. In this embodiment, the sound-absorbing material attachment means 8 includes a guide roller 9a that guides the sound-absorbing material P, a pressing portion 9b that presses the sound-absorbing material P guided by the guide roller 9a while placing it on the inner circumferential surface of the sealant layer SL, and a positioning mechanism 10 that positions the pressing portion 9b at a desired position. Various known sound-absorbing materials P (porous foam such as sponge, nonwoven fabric, etc.) can be used. For example, an industrial robot can be used as the positioning mechanism 10.

Next, an example of a procedure for manufacturing a pneumatic tire T2 according to the present invention will be described.

First, a green tire is vulcanized by a known method to manufacture tire T1. If necessary, a treatment is performed to remove any adhering release agent, etc., from a predetermined area of the tire inner surface Ta of tire T1. Tire T1 is held by rotating rollers 7a of a holding mechanism 7. Next, as shown in Figures 4 and 5, each radial tube 6b is contracted, and the holding mechanism 7 is slid in the direction of the axis CL so as to be close to the plunger 4, and each head 5 is placed inside tire T1.

As shown in Figs. 6 and 7, each radial tube 6b is then extended to bring each head 5 into contact with the tire inner surface Ta, and the heads 5 are arranged cylindrically with adjacent heads 5 connected to each other in the circumferential direction. This positions the heads 5 so that the recesses 5a cover a predetermined range of the tire inner surface Ta. In this embodiment, the heads 5 are arranged cylindrically so that the recesses 5a cover the entire tire inner surface Ta in a predetermined range that extends continuously around the entire tire circumferential direction.

When the head 5 is set on the tire T1 in this manner, as shown in FIG. 6, multiple radial tubes 6b radiate outward from the axial center tube 6a at the axial center of the cylindrically arranged head 5 toward each head 5. In a predetermined range of the tire inner surface Ta, a space C is formed that is surrounded by the recess 5a of the head 5 abutting against the tire inner surface Ta and the tire inner surface Ta facing the recess 5a. The present invention uses this space C as a cavity C.

In the sealant supplying means 2, the screw 3b of the extruder 3 is rotated to appropriately heat the sealant S contained inside the cylinder 3a while appropriately reducing the viscosity, and the sealant S is extruded from the extrusion port at the tip of the cylinder and fed into the plunger 4. In the plunger 4, the piston portion 4b is advanced to supply a desired amount of the fed sealant S through the supply pipe 6 to the head 5 (cavity C).

That is, as shown in FIG. 8, the sealant material S is filled into the cavity C through the axial tube 6a and each radial tube 6b. The amount of sealant material S supplied can be precisely adjusted by using the plunger 4. The sealant material S filled into the cavity C is shaped by the head 5 for a predetermined time (e.g., several tens of seconds to about 2 minutes), forming a sealant layer SL of a predetermined width W in a predetermined area of the tire inner surface Ta.

After the sealant layer SL is formed, each radial tube 6b is contracted, and each head 5 is separated from the manufactured tire T1 (tire inner surface Ta and sealant layer SL) and moved to the outside of the tire T1. In this way, as shown in FIG. 9, a sealant layer SL of a predetermined width W is formed in a predetermined area of the tire inner surface Ta.

Next, as shown in FIG. 10, the sound absorbing material attachment means 8 is used to laminate and bond the sound absorbing material P to a desired area on the inner circumferential surface of the sealant layer SL to form the sound absorbing layer PL. In this embodiment, a strip of sound absorbing material P is used. The positioning mechanism 10 moves the guide roller 9a and the pressing portion 9b into the tire T1, and the pressing portion 9b is positioned at a predetermined position.

Next, the sound-absorbing material P supplied from the supply source is guided by the guide roller 9a and sent to the pressing section 9b. The pressing section 9b is biased toward the tire inner surface Ta by a spring or the like. Therefore, the pressing section 9b presses the tip of the sound-absorbing material P while placing it on the inner surface of the sealant layer SL. At this time, the tire T1 is rotated by the holding mechanism 7. The tip of the pressed sound-absorbing material P is bonded to the inner surface of the sealant layer SL by the adhesive force of the sealant material S. Therefore, as the tire T1 rotates, the sound-absorbing material P is sequentially sent out to the tire inner surface Ta. As a result, as illustrated in Figures 11 and 12, the tip and rear ends of the strip-shaped sound-absorbing material P are butted together to form a cylindrical sound-absorbing layer PL that extends continuously around the entire tire circumference.

The sound-absorbing material P can be bonded to the inner surface of the sealant layer SL by interposing an adhesive layer between the sound-absorbing material P and the sealant layer SL. In this case, for example, an adhesive layer such as a double-sided adhesive tape is provided on the surface of the sound-absorbing material P facing the sealant layer SL.

As shown in FIG. 12, in this embodiment, the butting position Pc between the front and rear ends of the sound-absorbing material P is inclined with respect to the tire width direction. In FIG. 12, the horizontal direction is the tire width direction, and the up-down direction is the tire direction. The butting position Pc can also be extended parallel to the tire width direction, but extending it at an angle in this way is advantageous in avoiding deterioration of the uniformity of tire T2 due to the butting.

The sound absorbing layer PL is not limited to the form exemplified in this embodiment, and can be formed intermittently at intervals in the tire circumferential direction. The sound absorbing layer PL can also be formed at multiple positions spaced apart in the tire width direction. Alternatively, the sound absorbing material P can be extended spirally in the tire circumferential direction to form the sound absorbing layer PL on the inner circumferential side of the sealant layer SL.

As described above, by filling the cavity C with the sealant material S, the sealant layer SL of the specified width W is formed in the entire width direction at once. Therefore, the sealant layer SL of the specified width W can be quickly formed without the need for the complicated operation of wrapping the string-shaped sealant material around the tire inner surface Ta in the tire circumferential direction multiple times. Moreover, in this embodiment, the cylindrical sealant layer SL that is continuous in the tire circumferential direction is formed at once, which is extremely advantageous in shortening the time required to form the sealant layer SL.

A predetermined amount of sealant material S filled in cavity C is pressed against the tire inner surface Ta by head 5 and shaped. As a result, the variation in thickness of sealant layer SL in the width direction is suppressed. This is advantageous for stably forming a sealant layer SL of the desired specifications. The variation in thickness of sealant layer SL in the tire circumferential direction is also suppressed. By making the cross-sectional shape of recess 5a the same shape as the cross-sectional shape (profile) of the sealant layer SL to be formed, even a sealant layer SL with a complex profile can be easily formed.

As described above, the rapid formation of the sealant layer SL of the predetermined width W is advantageous for the rapid manufacture of tires T2 having a sound absorbing layer PL interposed therebetween. In addition, because the sealant layer SL of the predetermined width W is stably formed in a predetermined area of the tire inner surface Ta, the sound absorbing layer PL formed on the inner circumferential side of the sealant layer SL can also be stably formed. This is therefore advantageous for the stable manufacture of tires T2 having a sound absorbing layer PL interposed therebetween.

Figures 13 to 17 show another embodiment of the manufacturing device 1. This embodiment has a different specification for the head 5 compared to the previous embodiment, but the other configurations are substantially the same as the previous embodiment.

In this embodiment, only one head 5 is provided, and the tire T1 is rotated in the tire circumferential direction relative to the head 5 by the holding mechanism 7. This holding mechanism 7 is structured to rotate the tire T1, but instead of this holding mechanism 7, a mechanism for rotating the head 5 around the axle tube 6a can also be used. Alternatively, a mechanism for rotating the tire T1 and the head 5 can also be used.

To form the sealant layer SL, the tire T1 is held in an upright position using the rotating rollers 7a of the holding mechanism 7. Next, the head 5 is placed inside the tire T1 with the radial tubes 6b contracted. Thereafter, as illustrated in Fig. 14 and Fig. 15, the radial tubes 6b are extended to bring the head 5 into contact with the tire inner surface Ta, and the head 5 is placed so that the recesses 5a cover the tire inner surface Ta in a predetermined range. In this embodiment, as illustrated in Fig. 11, the head 5 is placed so that the recesses 5a cover a part of the tire inner surface Ta in a predetermined range that extends continuously around the entire tire circumferential direction.

Next, as shown in FIG. 16, a filling process is performed in which the sealant material S is filled into the cavity C through the supply pipe 6 to form a sealant layer SL in a circumferential section. Thereafter, as shown in FIG. 17, a filling process is performed in which the sealant material S is filled into the cavity C at positions where the head 5 is shifted sequentially in the tire circumferential direction. That is, after the filling process is performed at one position to form a sealant layer SL in a circumferential section, the holding mechanism 7 is immediately operated to position the head 5 in a position shifted in the tire circumferential direction by a portion of the circumferential direction, and the filling process is repeated at the shifted position. As a result, a cylindrical sealant layer SL is formed in a predetermined range of the tire inner surface Ta and in the tire circumferential direction with a predetermined width W.

In this embodiment, one radial tube 6b is provided at its tip with one head 5, but multiple radial tubes 6b may be provided with a head 5 at their tips. That is, the heads 5 are arranged at intervals in the circumferential direction on the tire inner surface Ta to form a sealant layer SL that is intermittent in the circumferential direction, and then the filling process is performed with the heads 5 arranged at positions that are sequentially shifted in the circumferential direction. In this way, a cylindrical sealant layer SL that is continuous in the tire circumferential direction with a predetermined width W can be formed in a predetermined area of the tire inner surface Ta. Then, a sound absorbing layer PL is formed on the inner surface of the formed sealant layer SL.

The sealant layer SL is formed by performing a plurality of filling steps at positions shifted sequentially in the tire circumferential direction. Therefore, as illustrated in FIG. 18, a joint position Sc of the sealant material S exists at the boundary between the ranges where each filling step has been performed. In FIG. 18, the horizontal direction is the tire width direction, and the vertical direction is the tire direction. At this joint position Sc, the sealant material S on both sides of the joint position Sc is smoothly integrated, but a slight step or viscosity difference may occur. Therefore, it is preferable to laminate the sound absorbing material P so that the joint position Sc and the butt position Pc of the front end and the rear end of the sound absorbing material P are shifted in the tire circumferential direction. By shifting the joint position Sc and the butt position Pc in the tire circumferential direction, it is advantageous to avoid deterioration of the uniformity of the tire T2.

1 Manufacturing device 2 Sealant supply means 3 Extruder 3a Cylinder 3b Screw 4 Plunger 4a Cylinder 4b Piston portion 5 Head 5a Recess 6 Supply pipe 6a Axial pipe 6b Radial pipe (setting mechanism)
7 Holding mechanism 7a Rotating roller 7b Base 7c Support section 8 Sound absorbing material mounting means 9a Guide roller 9b Pressing section 10 Positioning mechanism 11 Control section S Sealant material SL Sealant layer P Sound absorbing material PL Sound absorbing layers T1, T2 Tire Ta Tire inner surface

Claims (7)

A method for manufacturing a pneumatic tire in which a sound absorbing layer is provided in a predetermined area of a vulcanized inner surface of the tire with a sealant layer of a predetermined width interposed therebetween,
a head having a recess of a predetermined shape and a predetermined width in a cross section is positioned so that the recess covers the inner surface of the tire in the predetermined range, a space surrounded by the recess and the inner surface of the tire facing the recess is used as a cavity, and a sealant material is filled into the cavity to form the sealant layer on the inner surface of the tire, the head is positioned cylindrically so that the recess covers the entire inner surface of the tire in the predetermined range that extends continuously around the entire circumferential direction of the tire, and a sound-absorbing material is laminated on the inner side of the formed sealant layer to form a sound-absorbing layer. 2. The method for manufacturing a pneumatic tire according to claim 1, wherein a supply pipe is radially branched into a plurality of pipes extending from a cylindrical axial center portion of the head toward the cavity, and the sealant material is filled into the cavity through each of the branched supply pipes. A method for manufacturing a pneumatic tire in which a sound absorbing layer is provided in a predetermined area of a vulcanized inner surface of the tire with a sealant layer of a predetermined width interposed therebetween,
a head having a recess of a predetermined shape and a predetermined width in a cross section is positioned so that the recess covers the inner surface of the tire in the predetermined range, a space surrounded by the recess and the inner surface of the tire facing the recess is used as a cavity, and a sealant material is filled into the cavity to form the sealant layer on the inner surface of the tire, the head is positioned so that the recess covers the inner surface of the tire in a portion of the circumferential direction of the predetermined range that extends continuously around the entire circumferential direction of the tire, and a filling process of filling the cavity with the sealant material is performed at positions where the head is sequentially shifted in the circumferential direction of the tire, and a sound-absorbing material is laminated on the inner side of the formed sealant layer to form a sound-absorbing layer. The method for manufacturing a pneumatic tire according to any one of claims 1 to 3, wherein a front end and a rear end of a strip of the sound-absorbing material are butted together to form a cylindrical sound-absorbing layer that extends continuously around the entire circumferential direction of the tire. 5. The method for manufacturing a pneumatic tire according to claim 4, wherein the front end and rear end of a strip of the sound-absorbing material are butted together to form the cylindrical sound-absorbing layer that extends continuously around the entire circumference of the tire, and the butt position of the front end and the rear end and a joint position of the sealant material created by sequentially performing the filling process are shifted in the tire circumferential direction . A pneumatic tire manufacturing apparatus includes a sealant supplying means and a sound-absorbing material attaching means, and the sound-absorbing material is installed by the sound-absorbing material attaching means to form a sound-absorbing layer on a predetermined area of a vulcanized inner surface of the tire via a sealant layer of a predetermined width formed by a sealant material supplied by the sealant supplying means,
a head having a recess of a predetermined shape and the predetermined width in a cross-sectional view, a supply pipe that connects the sealant supply means and the head, and a setting mechanism that positions the head so that the tire inner surface in the predetermined range is covered by the recess,
a setting mechanism for setting the head in a cylindrical shape so that the entire inner surface of the tire over the predetermined range extending continuously around the entire circumferential direction of the tire is covered by the recess; a space surrounded by the recess of the head positioned by the setting mechanism and the inner surface of the tire facing the recess becomes a cavity; the sealant layer is formed by filling the cavity with the sealant material; and the sound-absorbing layer is formed by stacking the sound-absorbing material on the inner side of the formed sealant layer by the sound-absorbing material attachment means. A pneumatic tire manufacturing apparatus includes a sealant supplying means and a sound-absorbing material attaching means, and the sound-absorbing material is installed by the sound-absorbing material attaching means to form a sound-absorbing layer on a predetermined area of a vulcanized inner surface of the tire via a sealant layer of a predetermined width formed by a sealant material supplied by the sealant supplying means,
a head having a recess of a predetermined shape and the predetermined width in a cross-sectional view, a supply pipe that connects the sealant supply means and the head, and a setting mechanism that positions the head so that the tire inner surface in the predetermined range is covered by the recess,
a head is positioned by the setting mechanism so that the inner surface of the tire in a portion of the circumferential direction of the predetermined range extending continuously around the entire circumference of the tire is covered by the recess, a space surrounded by the recess of the head positioned by the setting mechanism and the inner surface of the tire facing the recess becomes a cavity, the sealant layer is formed by filling the cavity with the sealant material, and a filling process of filling the cavity with the sealant material is performed by positioning the heads in positions successively shifted in the tire circumferential direction, and the sound-absorbing layer is formed by stacking the sound-absorbing material by the sound-absorbing material attachment means on the inner side of the formed sealant layer.

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