JP7183672B2 - Method for manufacturing pneumatic tires - Google Patents

Description

The present invention relates to a method for manufacturing pneumatic tires. In particular, the present invention relates to a method of manufacturing a pneumatic tire with an innerliner.

In manufacturing a tire having an inner liner, a sheet is prepared that includes a band (base sheet) made of unvulcanized rubber, which is the material of the inner liner. The sheet is cut into predetermined lengths to obtain cut sheets. The cut sheet is wrapped around a drum to form a cylinder. At this time, the front end of the cut sheet, which is the start of winding, and the rear end, which is the end of winding, are overlapped so that sufficient bonding strength can be obtained. This overlapping portion is called a junction portion. This forms an inner liner around the drum.

In manufacturing this tire, other components such as a carcass are wound around the outer side of the inner liner. Other components are combined to obtain the raw cover. A raw cover is put into the mold. A bladder is inflated inside the low cover. The raw cover is sandwiched between the cavity surface of the mold and the bladder and is heated and pressurized. Heating causes the rubber composition to undergo a cross-linking reaction to form a tire. Japanese Unexamined Patent Application Publication No. 2001-232696 reports on a method of manufacturing a tire having an inner liner.

Japanese Patent Application Laid-Open No. 2001-232696

There is a method of applying a release agent to the inner surface of the raw cover so that the inner surface of the tire and the bladder can be smoothly separated when the tire is removed from the mold. In this method, if the release agent enters the joint portion of the inner liner, joint failure may occur at this portion. In this method, it is important to prevent poor bonding. A possible method is to apply the release agent to the surface of the bladder instead of the inner surface of the raw cover. However, applying the release agent to the bladder is troublesome. Furthermore, in this method, the release agent may drip and adhere to the side portion or the like as a foreign substance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a tire in which adhesion of a mold release agent to the side portion is prevented in a simple manner, and bonding failure at the bonding portion of the inner liner is prevented.

The present invention relates to a method of manufacturing a pneumatic tire with an innerliner. This method
(A) preparing a sheet including a strip-shaped first base sheet for forming the inner liner;
(B) obtaining a cut sheet by cutting the sheet so that the angle of the cut surface with respect to the direction in which the sheet extends is 20° or more and 50° or less when viewed from the side;
(C) winding the cut sheet on a drum such that the front and rear ends of the cut sheet overlap to form the tire component including the inner liner;
(D) a step of obtaining a low cover by combining the above constituent member with another constituent member of the tire;
(E) applying a release agent to the inner surface of the raw cover; and (F) pressing and heating the raw cover coated with the release agent with a mold.

Preferably, the sheet further includes a pair of second base sheets for forming a chafer, each of the second base sheets being joined to the outside in the width direction of the first base sheet.

Preferably, the above step (B) is
(B-1) setting the sheet so that the position of the sheet to be cut overlaps with a gap provided between a pair of anvils extending in the width direction of the sheet;
(B-2) A step of cutting the sheet by scanning along the gap with a cutter having an inclination of 20° or more and 50° or less with respect to the direction in which the sheet extends in a side view.

Preferably, in the step (B-2) above, the inclination angle of the cutter is changed during scanning, so that the inclination angle of the cutter when cutting the first base sheet portion of the sheet is adjusted to the above first base sheet portion. It is smaller than the angle of inclination of the cutter when cutting the two base sheet portions.

Preferably, in step (B-1) above, the sheet is held down by a pair of holding members from both sides of the gap, and the distance between the pair of holding members is 3 mm or more and 6 mm or less.

Preferably, in step (B-2) above, the cutter is scanned by an electric cylinder.

The inventors investigated a method for preventing the release agent from entering the joining portion of the inner liner. As a result, it was found that the angle of inclination of the joint surface at this portion greatly affects the prevention of entry of the release agent. When viewed from the side, it has been found that by inclining the angle of inclination with respect to the direction perpendicular to the inner surface of the low cover, this intrusion can be suppressed.

In the tire manufacturing method according to the present invention, the sheet is cut so that the angle of the cut surface with respect to the direction in which the sheet extends is 20° or more and 50° or less to obtain a cut sheet. When this cut sheet is wound on the drum, the joining surface between the front end and the rear end of the cut sheet is greatly inclined with respect to the vertical direction of the inner surface of the raw cover. This inclination effectively prevents the release agent applied to the inner surface of the raw cover from entering the joint portion. In this manufacturing method, defective joining at the joining portion of the inner liner is prevented. In this method of manufacture, no release agent is applied to the bladder. This manufacturing method is simple. In this manufacturing method, the release agent is prevented from adhering to the side surfaces. With this method, adhesion of the release agent to the side portion is easily prevented, and joint failure at the joint portion of the inner liner is prevented.

FIG. 1 is a plan view showing an apparatus for manufacturing a tire according to one embodiment of the present invention. 2 is a side view of the device of FIG. 1; FIG. FIG. 3 is a schematic diagram showing part of the apparatus of FIG. 4 is a side view showing a cut portion of a sheet cut by the apparatus of FIG. 1; FIG. 5 is a side view showing the cut sheet formed by the apparatus of FIG. 1 wound on a drum; FIG. FIG. 6 is a cross-sectional view in which the overlapped portion of the front end and the rear end of the cut sheet of FIG. 5 is enlarged.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

FIG. 1 is a plan view showing an example of manufacturing equipment 2 used in the manufacturing method according to the present invention. FIG. 2 is a side view of the device 2 of FIG. This device 2 forms a cut sheet that is wound onto the drum of the forming machine. The apparatus 2 comprises a supply roll 4 , a pressure roll 6 , a first carriage 8 , a cutter 10 and a second carriage 12 . Also shown in FIGS. 1 and 2 is the drum 14 of the molding machine.

A base sheet 16 is wound around the supply roll 4 to form a tire component. As shown in FIG. 1, in this embodiment, the supply rolls 4 include a first supply roll 4a and a pair of second supply rolls 4b. A first base sheet 16a made of unvulcanized rubber for forming an inner liner is wound around the first supply roll 4a. The rotation of the first supply roll 4a feeds out the first base sheet 16a. Each of the second supply rolls 4b is wound with a second base sheet 16b of cloth and unvulcanized rubber covering the cloth for forming a chafer. A pair of 2nd base sheets 16b are sent out because these rotate. The direction in which the first base sheet 16a and the second base sheet 16b are fed is indicated by arrow A in FIGS.

A pressure roll 6 is positioned downstream of the supply roll 4 . As shown in FIG. 1, on each side of the first base sheet 16a is a respective second base sheet 16b. Although not shown in the figure, the edge of the first base sheet 16a and the edge of the second base sheet 16b are overlapped. The first base sheet 16a and the second base sheet 16b are pressed together by pressing the overlapped portion with the pressing roll 6. As shown in FIG. Thus, the sheet 18 including the first base sheet 16a and the second base sheet 16b is obtained.

In this embodiment, the sheet 18 consists of a first base sheet 16a and a pair of second base sheets 16b. The sheet may further include another base sheet. For example, if the innerliner has a two-layer structure, a third basesheet for the innerliner is laid over the first basesheet 16a. The sheet may consist of only the first base sheet 16a. At this time, the second supply roll 4b and the pressure roll 6 are not present. The first base sheet 16a is sent to the next step as a sheet.

A first carrier 8 is positioned downstream of the pressure rolls 6 . A first transport table 8 feeds the sheet 18 to the desired position on the cutter 10 .

A cutter 10 is located downstream of the first carriage 8 . Cutter 10 cuts sheet 18 into cut sheets 20 of desired length. A portion of the cutter 10 is shown enlarged in FIG. This figure is a side view of the cutter 10 . Cutter 10 includes a pair of anvils 22 , a pair of hold downs 24 , cutter 26 and frame 28 . Although not shown, the cutter 10 further comprises a drive.

The pair of anvils 22 are plate-shaped. A sheet 18 is sent from the first carrier 8 onto these anvils 22 . Arrow A indicates the direction in which sheet 18 is fed. The pair of anvils 22 are arranged side by side with a gap 30 in the direction in which the sheet 18 extends (horizontal direction in FIG. 3). This gap 30 extends in the width direction of the sheet 18 . The direction in which the gap 30 extends may be inclined with respect to the width direction of the sheet 18 . In this specification, both are referred to as "the gap 30 extends across the width of the sheet 18".

Each of the pair of retainers 24 is positioned on both sides of the gap 30 . A pair of retainers 24 can retain the sheet 18 from both sides of the gap 30 .

As shown in FIG. 3, the cutter 26 is located in the gap 30 between the anvils 22 in side view. The cutter 26 is inclined with respect to the direction in which the sheet 18 extends. In FIG. 3, symbol θ represents this tilt angle. The inclination angle θ is 20° or more and 50° or less.

Frame 28 supports cutter 26 . The frame 28 comprises a main body 32 and a reinforcement portion 34 . A cutter 26 is attached to the tip of the main body 32 . The reinforcing portion 34 reinforces the main body 32 . The reinforcing portion 34 prevents the body 32 from shaking when the cutter 26 cuts the sheet 18 .

A drive unit (not shown) can move the retainer 24 up and down. By moving the retainer 24 downward, the retainer 24 retains the sheet 18 . The seat 18 is thereby fixed. The drive may cause frame 28 and cutter 26 to scan along gap 30 . Thereby, the sheet 18 is cut. Furthermore, the driving section can change the inclination angle θ of the cutter 26 by changing the inclination angle of the frame 28 .

A second carriage 12 is located downstream of the cutter 10 . The second carrier 12 carries the cut sheet 20 . The second conveyor 12 conveys the cut sheet 20 to the drum 14 .

The manufacturing method of this tire is
(1) preparing a sheet 18;
(2) cutting the sheet 18 to obtain a cut sheet 20;
(3) winding the cut sheet 20 onto the drum 14;
(4) obtaining a low cover;
(5) applying a release agent; and (6) pressing and heating the raw cover with a mold.

In the step (1) above, the first supply roll 4a rotates to supply the first base sheet 16a to the pressing roll 6, and the pair of second supply rolls 4b rotates to supply the pair of second base sheets 16b. is supplied to the pressure roll 6 . These are pressed together to obtain a sheet 18 comprising a first base sheet 16a and a second base sheet 16b joined to both sides in the width direction of the first base sheet 16a.

In step (2) above, the sheet 18 is sent to the cutter 10 by the first carrier 8 . At this time, the restrainer 24 is positioned above the seat 18 . The sheet 18 is moved to a position where the cutting position of the sheet 18 overlaps the gap 30 between the anvils 22, and the movement of the sheet 18 is stopped. The restrainer 24 is lowered to the seat 18 by the drive. A restrainer 24 restrains the sheet 18 . Thereby, the sheet 18 is set on the cutting table.

In step (2) above, after the sheet 18 is set, the drive unit scans the frame 28 and the cutter 26 along the gap 30 . Thereby, the sheet 18 is cut into cut sheets 20 of a desired length. FIG. 4 is a side view of the sheet 18 cut by the cutter 26 and the cut sheet 20. FIG. As described above, since the cutter 26 is inclined with respect to the direction in which the sheet 18 extends, the cut surfaces 33 of the sheet 18 and the cut sheet 20 are also inclined with respect to the direction in which the sheet 18 extends. The inclination angle of the cut surface 33 is the same as the inclination angle θ of the cutter 26 . The inclination angle θ of the cut surface 33 is 20° or more and 50° or less.

In step (3) above, the cut sheet 20 is sent to the drum 14 by the second carrier 12 . The front end of the cut sheet 20 is put on the outer circumference of the drum 14 . The drum 14 rotates and the cut sheet 20 is wound around the drum 14 . This situation is shown in FIG. As shown in FIG. 5, the leading edge 36 and the trailing edge 38 of the cut sheet 20 have an overlap. The cut sheets 20 are stacked such that the cut surface 33 of the front end 36 faces the drum 14 side and the cut surface of the rear end 38 faces away from the drum 14 . Although not shown, this overlapped portion is pressed by, for example, a roller, and the front end 36 and the rear end 38 are joined. This forms an inner liner 42 around the drum 14 . In this embodiment, a chafer is formed together. The inner surface of the inner liner 42 and the inner surface of the chafer constitute the inner surface of the raw cover. FIG. 6 is a cross-sectional view in which the overlapping portion is enlarged. This portion is referred to as the junction portion 40 .

In step (4) above, other constituent members of the tire are laminated on the outer side of the formed inner liner 42 . In this embodiment, the carcass 44 is laminated. Also shown in FIG. 6 is a carcass 44 laminated to the outside of the innerliner 42 . This process also assembles other components such as beads, sidewalls, belts and treads. This gives a raw cover.

In step (5) above, a release agent is applied to the inner surface of the raw cover. In this embodiment, the inner surface of the raw cover is sprayed with a release agent.

In step (6) above, the raw cover is put into the mold. A bladder is inflated inside the low cover. The bladder contacts the inner surface of the raw cover. The raw cover is sandwiched between the cavity surface of the mold and the bladder and is heated and pressurized. This heat and pressure cause the rubber composition of the raw cover to flow. The rubber composition undergoes a cross-linking reaction by heating to obtain a tire.

The effects of the present invention will be described below.

In the tire manufacturing method according to the present invention, the sheet 18 is cut so that the inclination angle θ of the cut surface 33 of the sheet 18 is 20° or more and 50° or less. By setting the inclination angle θ to 50° or less, when the cut sheet 20 is wound on the drum 14 as shown in FIG. A large inclination from the vertical direction. This inclination effectively prevents the release agent applied to the inner surface of the raw cover from entering the joint portion 40 . In this manufacturing method, defective bonding at the bonding portion 40 of the inner liner 42 is prevented. By setting the inclination angle θ to 20° or more, the narrowed portion of the front end 36 and the narrowed portion of the rear end 38 of the cut sheet 20 have sufficient strength. Chipping of these parts is prevented. This effectively prevents poor bonding of the bonding portion 40 of the inner liner 42 .

In this method of manufacture, no release agent is applied to the bladder. This manufacturing method is simple. In this manufacturing method, the release agent does not adhere to the side surfaces. In this method, adhesion of the release agent to the side portion is easily prevented, and joint failure at the joint portion 40 of the inner liner 42 is prevented.

As previously mentioned, when the cut sheet is wound onto the drum, the leading and trailing edges of the cut sheet overlap. A step is generated in the inner liner at this joint portion. When another component such as a carcass is laminated on the outer side of the inner liner, air tends to remain between the inner liner and the component at the stepped portion.

In this manufacturing method, the inclination angle θ of the cut surface 33 of the cut sheet 20 is 50° or less. As shown in FIG. 6, in the inner liner 42 formed from the cut sheet 20, the surface forming the step at the joint portion 40 is gently inclined. Other constituent members are laminated along this slope. This effectively prevents air from remaining between the innerliner 42 and this component. In this manufacturing method, air residue between the inner liner 42 and other components laminated on the outer side of the inner liner 42 is prevented.

In this embodiment, sheet 18 includes a first base sheet 16a and a second base sheet 16b. The second base sheet 16b including fabric is stiffer than the first base sheet 16a. If the inclination angle θ of the cutting surface 33 (inclination angle θ of the cutter 26) is too small, the portion where the cutter 26 contacts the hard second base sheet 16b becomes longer. This can cause poor cutting of the second base sheet 16b.

In this method, the inclination angle θ of the cutter 26 is 20° or more. This cutter 26 can cut the hard second base sheet 16b smoothly and accurately. In this method, cutting defects of the sheet 18 are prevented.

From the viewpoints of preventing the release agent from entering the joint portion 40 and preventing air from remaining in the joint portion 40 of the inner liner, the inclination angle θ is more preferably 45° or less, further preferably 40° or less. From the viewpoints of preventing chipping at the front end 36 and rear end 38 of the cut sheet 20 and preventing defective cutting of the second base sheet 16b, the angle θ is more preferably 20° or more, and further preferably 30° or more.

As mentioned above, the drive section of the cutter 10 can change the tilt angle θ of the cutter 26 . The inclination angle θ1 of the cutter 26 when cutting the first base sheet 16a portion of the sheet 18 is preferably smaller than the inclination angle θ2 of the cutter 26 when cutting the second base sheet 16b portion. The inner surface of the raw cover is mainly composed of the inner surface of the inner liner 42 . Reducing the inclination angle θ1 effectively prevents the release agent applied to the inner surface of the raw cover from entering the joining portion 40 . Furthermore, air residue between the joint portion 40 of the inner liner 42 and other components is effectively prevented. By increasing the inclination angle θ2, the hard second base sheet 16b can be cut smoothly and accurately. This method effectively prevents the cutting failure of the sheet 18 .

The widthwise end of the base sheet for the inner liner 42 overlaps with the widthwise end of the adjacent chafer base sheet. At this overlapping portion, the inclination angle of the cutter 26 is θ2. That is, the angle of inclination of the cutter 26 at the location where the chafer base sheet is present is θ2. The same applies when the inner liner 42 is composed of a plurality of base sheets.

Preventing the release agent applied to the inner surface of the raw cover from entering the joint portion 40, preventing air residue between the joint portion 40 of the inner liner 42 and other components, and preventing defective cutting of the sheet 18. Therefore, the inclination angle θ1 is preferably 20° or more and 40° or less, and the inclination angle θ2 is preferably 30° or more and 50° or less.

Since the hardness of the first base sheet 16a differs from that of the second base sheet 16b, when the cutter 26 is scanned, cutting defects are likely to occur at the boundary between the second base sheet 16b and the first base sheet 16a. In FIG. 3, a double arrow D indicates the distance between the pair of restrainers 24. As shown in FIG. This interval D is the distance between the tips of the pressing members 24 when the pressing members 24 hold the sheet 18 down. The distance D is preferably 6 mm or less. By setting the distance D to 6 mm or less, the restrainer 24 restrains movement and deformation of the sheet 18 . In this method, defective cutting is prevented even at the boundary between the first base sheet 16a and the second base sheet 16b. From this point of view, the distance D is more preferably 5 mm or less, more preferably 4.4 mm or less. The distance D is preferably 3 mm or more. By setting the distance D to 3 mm or more, the cutter 26 is prevented from coming into contact with the anvil 22 even when the cutter 26 is inclined. From this point of view, the interval D is more preferably 3.6 mm or more.

It is preferable that the drive section for scanning the cutter 26 is composed of an electric cylinder. The electric cylinder can scan the cutter 26 with a stable torque. This allows the sheets 18 to be stably cut even at the boundary between the first base sheet 16a and the second base sheet 16b. In this method, defective cutting is prevented even at the boundary between the first base sheet 16a and the second base sheet 16b.

The effects of the present invention will be clarified by examples below, but the present invention should not be construed in a limited manner based on the description of these examples.

[Example 1]
The steps indicated in the manufacturing method according to the invention described above were carried out. The parameters for cutting the sheets are shown in Tables 1 and 2. This sheet includes a first base sheet for innerliner and a second base sheet for chafer joined in the width direction of the first base sheet. The sheet further comprises a third base sheet for an innerliner overlaid on the first base sheet. The first base sheet had a width of 420 mm and a thickness of 1.0 mm, the second base sheet had a width of 45 mm and a thickness of 0.8 mm, and the third base sheet had a width of 470 mm and a thickness of 1.0 mm. rice field. An electric cylinder was used as the drive for scanning the cutter.

[Comparative Example 1]
The inclination angles θ1 and θ2 and the interval D were as shown in Table 1. An air cylinder was used as the driving part for scanning the cutter. Comparative Example 1 is the same as Example 1 except for these.

[Example 2-5]
Example 2-5 is the same as Example 1 except that the tilt angles θ1 and θ2 are set to the values shown in Table 1.

[Example 6-7]
Examples 6 and 7 are the same as Example 1, except that the distance D is set to the value shown in Table 2.

[Example 8]
Example 8 is the same as Example 1, except that an air cylinder is used as a driving portion for scanning the cutter.

[Entering mold release agent]
Ten tires were manufactured for each of the examples and comparative examples. For each tire, the tire was cut at three randomly selected locations. The cross section of the joint portion of the inner liner was observed to evaluate the extent of penetration of the release agent. The results are shown in Table 1-2 in four stages A to D. In the order of A, B, C and D, the penetration of the release agent is small. A, B, C and D are preferred in that order.

[Cutting surface]
A sheet was cut by the method according to the present invention to produce 10 cut sheets. The state of the cut surface of this cut sheet was confirmed. The results are shown in Table 1-2 as indices with Comparative Example 1 being 100. The larger the value, the smoother and more precise the cut. A larger value is preferable.

[Remaining air]
A cut sheet produced by the method according to the present invention was wound on a drum to form an inner liner, and a carcass was laminated on the outer periphery of the inner liner. At this stage, 10 randomly selected cuts were made to check for any remaining air between the inner liner and the carcass. The results are shown in Table 1-2 in four stages A to D. A, B, C, and D have less remaining air. A, B, C and D are preferred in that order.

As shown in Table 1-2, the production methods of Examples are generally superior to the production methods of Comparative Examples. From this evaluation result, the superiority of the present invention is clear.

The methods described above can also be applied to the manufacture of various tires with innerliners.

DESCRIPTION OF SYMBOLS 2... Manufacturing apparatus 4... Supply roll 4a... First supply roll 4b... Second supply roll 6... Compression roll 8... First carrier 10... Cutter 12. Second carrier 14 Drum 16 Base sheet 16a First base sheet 16b Second base sheet 18 Sheet 20 Cut sheet 22 Anvil 24 --- Retainer 26 --- Cutter 28 --- Frame 30 --- Gap 32 --- Main body 34 --- Reinforcing portion 36 --- Front end 38 --- Rear end 40 --- Joint portion 42-- .. Inner liner 44 .. Carcass 46 .. Joint surface

Claims (8)

A method for manufacturing a pneumatic tire having an inner liner, comprising:
(A) includes a strip-shaped first base sheet for forming the inner liner and a pair of second base sheets for forming the chafer, each of the second base sheets extending in the width direction of the first base sheet; providing a sheet that is bonded to the outside of the
(B) In a side view, the angle of the cut surface with respect to the direction in which the sheet extends is 20° or more and 50° or less, and the angle of the cut surface at the portion of the first base sheet is equal to that of the second base sheet. A step of cutting the sheet so that the angle of the cut surface at the part is smaller than the above angle to obtain a cut sheet;
(C) winding the cut sheet on a drum such that the front and rear ends of the cut sheet overlap to form the tire component including the inner liner;
(D) a step of obtaining a low cover by combining the above constituent member with another constituent member of the tire;
(E) a step of applying a release agent to the inner surface of the raw cover; and (F) a step of pressurizing and heating the raw cover coated with the release agent with a mold. The above step (B) is
(B-1) setting the sheet so that the position of the sheet to be cut overlaps with a gap provided between a pair of anvils extending in the width direction of the sheet;
(B-2) The step of cutting the sheet by scanning along the gap with a cutter having an inclination of 20° or more and 50° or less with respect to the direction in which the sheet extends in side view. tire manufacturing method. In the step (B-2) above, by changing the inclination angle of the cutter during scanning, the inclination angle of the cutter when cutting the first base sheet portion of the sheet is changed to the second base sheet. 3. The method of manufacturing a tire according to claim 2 , wherein the angle of inclination of the cutter when cutting the portion is smaller than that of the cutter. A method for manufacturing a pneumatic tire having an inner liner, comprising:
(A) preparing a sheet including a strip-shaped first base sheet for forming the inner liner;
(B) obtaining a cut sheet by cutting the sheet so that the angle of the cut surface with respect to the direction in which the sheet extends is 20° or more and 50° or less when viewed from the side;
(C) winding the cut sheet on a drum such that the front and rear ends of the cut sheet overlap to form the tire component including the inner liner;
(D) a step of obtaining a low cover by combining the above constituent member with another constituent member of the tire;
(E) a step of applying a release agent to the inner surface of the raw cover;
as well as
(F) a step of pressurizing and heating the raw cover coated with the release agent with a mold;
including
The above step (B) is
(B-1) setting the sheet so that the position of the sheet to be cut overlaps with a gap provided between a pair of anvils extending in the width direction of the sheet;
(B-2) A step of cutting the sheet by scanning along the gap with a cutter having an inclination of 20° or more and 50° or less with respect to the direction in which the sheet extends in side view.
including
In the step (B-1), the tire manufacturing method , wherein the sheet is held by a pair of holding members from both sides of the gap. 5. The method of manufacturing a tire according to claim 4 , wherein the distance between the pair of restrainers is 3 mm or more and 6 mm or less. 6. The sheet according to claim 4 or 5, wherein the sheet further includes a pair of second base sheets for forming chafers, each of the second base sheets being joined to the outside of the first base sheet in the width direction. A method for manufacturing the described tire. The tire manufacturing method according to any one of claims 2 to 6 , wherein in the step (B-2), the cutter is scanned by an electric cylinder. A method for manufacturing a pneumatic tire having an inner liner, comprising:
(A) preparing a sheet including a strip-shaped first base sheet for forming the inner liner;
(B) obtaining a cut sheet by cutting the sheet so that the angle of the cut surface with respect to the direction in which the sheet extends is 20° or more and 50° or less when viewed from the side;
(C) The cut sheet is placed on the drum so that the front and rear ends thereof overlap, the cut surface of the front end faces the drum side, and the cut surface of the rear end faces the opposite side of the drum. rolling to form the tire components including the innerliner;
(D) a step of obtaining a low cover by combining the above constituent member with another constituent member of the tire;
(E) a step of applying a release agent to the inner surface of the raw cover;
as well as
(F) A step of pressurizing and heating the raw cover coated with the release agent with a mold
A method of manufacturing a tire, comprising:

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