JP2000158557A - Manufacture of sealant-containing tire and sealant- containing tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a sealant chamber with a precise shape by a method wherein the clear boundary between a portion to be vulcanizingly bonded and a portion not to be vulcanizingly bonded is produced at the time vulcanizing molding of a green tire. SOLUTION: A green tire 24, which is formed by putting a tire main body 1 on an inner liner 2, is set in an upper mold and a bottom mold so as to inflate a bladder from its inside with an air pressure in order to perform a vulcanizing molding. In this case, by interposing a release sheet 9 such as a fluororesin sheet or the like, only one side of which is releasable, with its releasable surface opposed to the inner liner 2, the inner liner 2 is prevented from being vulcanizingly bonded to the tire main body 1, resulting in allowing to form a sealing compound chamber with a precise shape for filling a sealing compound therein. When the releasing sheet 9 is constituted of a material soluble in the sealing compound, the lowering of the sealing properties due to the release sheet left in the sealing compound chamber can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a tire with a sealant having a ring-shaped sealant chamber partitioned by an inner liner inside a tread, and a tire with a sealant produced by the method. .

[0002]

2. Description of the Related Art Inside a tread of a tire body, a sealing agent chamber at least partly partitioned by an inner liner is formed, and a puncture of the tread by a nail or the like is self-sealed with a sealing agent sealed in the sealing agent chamber. Japanese Patent Application Laid-Open No. Hei 8 (1994) discloses a tire containing a sealant that delays air leakage from a puncture.
It is known from JP-A-323875.

[0003] In the conventional tire containing a sealant, when the inner liner is superimposed on the tire body before vulcanization molding, talc or the like is formed on a part of a contact surface between the two or a part of a contact surface between the inner liners. By performing vulcanization molding in a state where the release agent is applied, the inner liner is integrated with the tire main body, and a portion where the release agent is applied is left in a non-adhered state to form a sealant chamber. It has become.

[0004]

When a green tire comprising a tire body and an inner liner is inserted into a heating mold and vulcanized to form the inner liner, the inner liner is stretched. A low portion may occur, and the boundary between the portion to be vulcanized and bonded and the portion not to be vulcanized may be unclear, so that a completely shaped sealant chamber may not be formed. Therefore, it is difficult to form a sealant chamber having a desired shape, and there is a problem that the degree of freedom in designing the shape of the sealant chamber is limited.

The present invention has been made in view of the above-mentioned circumstances, and when vulcanizing and molding a green tire, a boundary between a portion to be vulcanized and bonded and a portion not to be vulcanized is made clear to form a sealant chamber having an accurate shape. It is intended to be able to form.

[0006]

Means for Solving the Problems To achieve the above object, the invention described in claim 1 is characterized in that an inner liner is superposed on the inner surface of a tire body before vulcanization molding and vulcanization molding is performed. At least a part of the inner liner is vulcanized and adhered to the inner surface of the tire main body, and in a method of manufacturing a tire containing a sealant forming a ring-shaped sealant chamber partitioned by the inner liner inside a tread, before vulcanization molding, A release sheet having releasability is disposed at a portion of the inner liner facing the sealant chamber.

According to the above configuration, when the inner liner is overlaid on the inner surface of the tire main body before vulcanization molding, the release sheet having releasability is arranged at a portion facing the sealant chamber of the inner liner. In the vulcanization molding, the portion of the inner liner facing the sealant chamber can be reliably prevented from being vulcanized and bonded, and the portion not facing the sealant chamber can be reliably vulcanized and bonded. Accordingly, the degree of freedom in designing the shape of the sealant chamber is improved, and the sealant chamber can be formed in an accurate shape.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, at least a part of one surface of the release sheet has a release property, and the release sheet is released. The part having no property is vulcanized and adhered to the wall surface of the sealant chamber during vulcanization molding.

According to the above configuration, since the release sheet has the part having the releasing property and the part having no releasing property, the vulcanization adhesion of the inner liner is prevented at the part having the releasing property. Thus, the sealant chamber can be formed, and the inner liner can be vulcanized and adhered to the wall surface of the sealant chamber at a portion having no releasability to prevent the inner liner from being perturbed. In addition, if the part having releasability is a part of one surface of the release sheet, the inner liner is connected to the inner surface of the tire body at that part, and the shape of the sealant chamber can be stabilized.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the release sheet is made of a material dissolvable in the sealant, and is dissolved by injecting the sealant into the sealant chamber. It is characterized by doing.

According to the above configuration, when the sealant is injected into the sealant chamber, the release sheet dissolves in the sealant, so that it is possible to reliably prevent a decrease in sealing performance due to the residual release sheet.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the release sheet is made of water-soluble paper or nonwoven fabric.

According to the above configuration, the release sheet can be reliably dissolved by injecting the sealant.

According to a fifth aspect of the present invention, in addition to the constitution of the third aspect, the release sheet is a film made of a natural polysaccharide.

According to the above construction, the release sheet can be reliably dissolved by injecting the sealant.

According to a sixth aspect of the present invention, in addition to the configuration of the first aspect, a plurality of release sheets are stacked and arranged.

According to the above configuration, even when the release sheet is stretched together with the tire body and the inner liner during vulcanization molding, the plurality of release sheets slide on each other at the contact surfaces thereof, so that the release sheet is broken. As a result, undesirable vulcanization adhesion between the tire body and the inner liner can be reliably avoided.

According to a seventh aspect of the present invention, in addition to the configuration of the first aspect, the release sheet is folded into a corrugated shape before vulcanization molding, and the release sheet is stretched during vulcanization molding. It is characterized by the following.

According to the above configuration, even if the release sheet is stretched together with the tire body and the inner liner at the time of vulcanization molding, the release sheet folded in a corrugated shape is freely stretched to prevent breakage. And undesired vulcanization adhesion of the inner liner can be reliably avoided.

According to the invention described in claim 8,
A tire with a sealant manufactured by the manufacturing method according to any one of claims 1 to 7 is proposed.

According to the above configuration, a high quality sealant-containing tire having a sealant chamber of an accurate shape can be provided.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a wheel on which a tire is mounted, FIG. 2 is a first partial view of a tire manufacturing process, and FIG. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 2, and FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG.

As shown in FIG. 1, a tubeless tire T composed of a tire main body 1 and an inner liner 2 vulcanized and bonded therein is mounted on a rim R of a motorcycle wheel. The left and right sides of the inner liner 2 except for the central portion are vulcanized and bonded to the inner surface of the tire body 1, and an air chamber 5 having a substantially circular cross section is defined inside the inner liner 2. A sealant chamber 6 having a substantially arc-shaped cross section is defined between the inner surface of the main body 1 and the sealant chamber 6. Sealant room 6
Is filled with a known liquid sealant 7.

The rim R has an annular rim body 11 extending in the circumferential direction of the tire T, and a pair of flanges extending radially outward from both ends in the width direction of the rim body 11 to hold the inner periphery of the tire body 1. 12, 12 are provided. An air valve 13 that fills the air chamber 5 formed inside the inner liner 2 with air is supported through an air valve attachment portion 14 formed at one location in the circumferential direction of the rim main body 11.

Since the sealant chamber 6 of the inner liner 2 is held in a shape along the inside of the tread 15 by the air pressure of the air chamber 5, the tire body 1 is punctured from the radial direction or from the side by a nail or the like. However, the sealant 7 immediately fills and repairs the puncture, and delays the leakage of air from the air chamber 5. Further, since the sealant 7 is held in the sealant chamber 6 and does not flow out to the air chamber 5 side,
There is no clogging of the air valve 13 or the pressure gauge applied thereto.

Next, a manufacturing process of the tire T will be described with reference to FIGS.

The manufacturing process of the tire T includes an inner liner winding process, a release sheet winding process, a green tire winding process, a mold setting process, a vulcanization process, a sealing agent injection process, and an inspection process.

First, a tubular inner liner 2 made of raw rubber is fitted to the outer periphery of the drum 23 in the inner liner winding step, and the release sheet 9 is wound around the outer liner of the inner liner 2 in the subsequent release sheet winding step. . Then, in a raw tire winding step, the raw material of each part of the tire main body 1 is wound around the outer periphery of the inner liner 2 and the release sheet 9 to form a raw tire 24.

[0030] Figure 4 shows a cross section of the green tire 24 wrapped around the drum 23, and most of the width W ₁ of the inner liner 2 situated inside, the release sheet was superimposed on the outer side 9 the width W ₂ of is smaller, thus a part of the inner liner 2 from left and right ends of the release sheet 9 projects. The release sheet 9 is made of a fluororesin sheet (Teflon sheet) or a silicon resin sheet having a thickness of 50 μm or less, and a commercially available product is available. For example,
As a Teflon sheet, there is Aflex (trade name) of Asahi Glass Co., Ltd.

The release sheet 9 has one surface subjected to a corona discharge treatment or a CS treatment, and the surface subjected to the treatment loses the releasability and the adhesion to rubber is enhanced. I have. Then, one surface on which the above-described processing is performed is the tire body 1
, And the other untreated surface having release properties contacts the inner liner 2.

In the corona discharge treatment, the surface is made of polyester,
A high-pressure corona discharge is generated between an electrode connected to a high-voltage generator and the metal roll while running the release sheet 9 as an object to be processed along a metal roll covered with a Hypalon, EP rubber, or the like. The ozone or nitric oxide that has generated corona reacts with the surface of the release sheet 9 to generate carbonyl groups and the like, so that the surface becomes hydrophilic. In the CS process, a plasma discharge process is performed under vacuum instead of the corona discharge, and the same operation and effect as the corona discharge process can be obtained.

The tire main body 1 made of raw rubber is wound around the outer periphery of the inner liner 2 and the release sheet 9 to form a raw tire 24. The tire main body 1 includes a cord portion 25 wound around the inner liner 2 and the release sheet 9 in the radial direction, and a pair of beads fitted to the outer periphery of the inner liner 2 so as to be connected to both axial ends of the cord portion 25. And a tread portion 27 wound around the cord portion 25 and the bead portions 26, 26 so as to cover the outside in the radial direction.

Subsequently, the raw tire 24 removed from the drum 23 is set between the upper mold 29 and the lower mold 30 for vulcanization molding in a mold setting step. Further, the upper mold 29 and the lower mold 30 are heated in the vulcanization step shown in FIG.
4 is inflated by air pressure, and the raw tire 24 is pressed by the upper mold 29 and the lower mold 30 with the pressure.
And vulcanization molding so as to obtain a final product shape. In this vulcanization molding, the inner liner 2 is integrated with the tire main body 1.

At this time, the release sheet 9 is sandwiched and compressed between the inner liner 2 and the tire main body 1 by the pressure of the expanding brother 31, and the other is in contact with the inner liner 2 of the release sheet 9. The surface (that is, the surface that has not been subjected to the surface treatment) is not vulcanized and bonded to the inner liner 2, and one surface that contacts the tire body 1 (that is,
The surface-treated side) is vulcanized and bonded to the tire body 1.

By using the release sheet 9 in this manner, the parts that need to be vulcanized are securely vulcanized and bonded, and the parts that should not be vulcanized are securely left unbonded. The sealant chamber 6 having a correct shape can be formed between the inner liner 2 and the tire main body 1. Further, since the release sheet 9 is fixed to the inner surface of the tire main body 1 by being vulcanized and adhered, the release sheet 9 may be perturbed inside the sealant chamber 6 and obstruct the free flow of the sealant 7. In addition, the sealing effect by the sealing agent is reliably exhibited.

After the vulcanization molding is completed, the one in which the tire body 1 and the inner liner 2 are integrated is taken out of the mold, and the sealant 7 is inserted into the sealant chamber 6 using a syringe or the like in a sealant injection step. To complete the tire T,
In the final inspection step, the finished product is inspected and all the steps are completed.

Next, a second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 6, the tire T of the second embodiment
Includes a first inner liner 2 ₁ is vulcanization bonded to the radially outer portion of the inner surface of the tire body 1, pressure in the left and right ends of the radially inner portion and the first inner liner 2 ₁ of the inner surface of the tire body 1 vulcanization is wearing, and a second inner liner 2 ₂ defining a sealant chamber 6 between the first inner liner 2 _1. Release sheet 9 to the first inner liner 2 ₁ wall facing the sealant chamber 6 is fixed by vulcanization bonding.

[0040] Figure 7 shows a green tire wrapping step for the tire T of the second embodiment, the release sheet 9 is wound around the second outer circumference of the inner liner 2 ₂ which is wound around the outer circumference of the drum 23, further Outside the first inner liner 2
₁ is wound. Release sheet 9, the surface facing the first inner liner 2 ₁ is corona discharge treatment or CS
Handle decorated with bonded by vulcanization to the first inner liner 2 ₁ and the surface facing the second inner liner 2 ₂ forms a sealant chamber 6 exerts a releasing property. According to the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 8, the tire T of the third embodiment
Has a single inner liner 2 like the tire T of the first embodiment, and both ends of the inner liner 2 are vulcanized and bonded to the inner surface of the tire body 1 as in the first embodiment. Not only that, the central part has a predetermined width (for example, 5
mm) on the inner surface of the tire body 1. Therefore, the sealant chambers 6, 6 are separated into two chambers on the left and right sides of the center of the inner liner 2 at the bonding portion 32, stabilizing the shape of the sealant chambers 6, 6 and increasing the size of the tire T. In this case, the movement of the sealant 7 in the sealant chambers 6, 6 can be minimized.

FIG. 9 shows a raw tire winding process of the tire T of the third embodiment, in which two release sheets 9, 9 are provided on the outer periphery of the inner liner 2 wound around the outer periphery of the drum 23.
9 are wound around each other at an interval of 5 mm, and further, the raw material of each part of the tire main body 1 is wound around the periphery thereof to form a raw tire 24. The surfaces of the release sheets 9 and 9 facing the inner liner 2 have releasability, and the surfaces facing the tire main body 1 are removed from the releasability by corona discharge treatment or CS treatment. Thereby, the sealing agent chambers 6 and 6 divided into two chambers can be formed in an accurate shape.

When the tire T having the structure shown in FIG. 8 is manufactured, the two release sheets 9, 9 are arranged at intervals in the third embodiment, but the following two methods are used. Ba 1
The same effect can be obtained by using a single release sheet 9.

In the first method, the entire surface of the release sheet 9 facing the tire main body 1 is eliminated by corona discharge treatment or CS treatment, and a part of the surface facing the inner liner 2 is further removed. The mold release property is eliminated by corona discharge treatment or CS treatment. By doing so, a part of the surface on the opposite side of the release sheet 9 adhered to the tire main body 1 is adhered to the inner liner 2, so that the tire T having the structure shown in FIG. 8 can be obtained. The portion of the surface facing the inner liner 2 that eliminates the releasability may be linear or spot-shaped.

In the second method, a slit-like opening or a spot-like opening is previously formed in the release sheet 9 in which the surface facing the tire main body 1 has been released from the release property by corona discharge treatment or CS treatment. Things. By doing so, the inner liner 2 comes into contact with the tire body 1 via the opening of the release sheet 9 and is vulcanized and bonded, so that the tire T having the structure shown in FIG. 8 can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.

In each of the first to third embodiments, one release sheet 9 is used, but as shown in FIG.
In an embodiment the release sheet 9 ₁ of three in the first inner liner 2 ₁ and the second between the inner liner 2 ₂ in the state of the raw tire 24, 9 _2, 9 ₃ are arranged in a stacked state. The three release sheets 9 ₁ , 9 ₂ , and 9 ₃ are made of a material that dissolves in the sealant 7 containing water and ethylene glycol as main components, such as water-soluble paper, nonwoven fabric, and edible film.
The edible film is a film mainly composed of carrageenan, a natural polysaccharide extracted from seaweed, and is soluble in the sealant 7 because it is water-soluble.

As described above, the three release sheets 9₁, 9_Two,
9_ThreeBy laminating the raw tire 24 in the vulcanization process.
Set between the upper mold 29 and the lower mold 30 and heat
When vulcanizing to the final product shape, release sheet
9₁, 9_Two, 9_ThreeOf the first inner liner
ー 2₁And the second inner liner 2_TwoVulcanization welding
It can be reliably prevented from being worn. Because
For example, during the vulcanization molding, the release sheet 9 together with the raw tire 24
₁, 9_Two, 9_ThreeIs drawn in the direction of arrow aa in FIG.
The three release sheets 9 are stretched.₁, 9_Two,
9_ThreeAre slid over each other to prevent breakage.
The first inner liner 2₁And the second inner
Liner 2_TwoWill no longer be in direct contact
You. At this time, the central release sheet 9_TwoTalc on both sides
If put on, release sheet 9₁, 9 _Two, 9_ThreeMutual sliding
Better to prevent breakage.
You.

The sealant 7 is provided inside the sealant chamber 6.
As shown in FIG. 11B, the release sheets 9 ₁ , 9 ₂ , 9 ₃ remaining in the sealant chamber 6 are dissolved, so that the release sheets 9 ₁ , 9 ₂ , 9 ₃ remain. More sealing agent 7
It is possible to reliably prevent the sealing property from being hindered.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

The fifth embodiment is similar to the fourth embodiment.
Release sheets 9₁, 9_Two, 9_ThreeOne of them, for example
Central release sheet 9_TwoIs formed into a waveform in advance.
You. In this way, the raw tire 24 is finally finished in the vulcanization process.
When vulcanizing to a product shape, the raw tire 24
With 3 release sheets 9₁, 9_Two, 9_ThreeIs stretched
If the two release sheets 9 are₁, 9_ThreeBreaks
The corrugated release sheet 9_TwoIs extended linearly
Since breakage is prevented, the first inner liner 2 ₁And
And second inner liner 2_TwoVulcanize each other in direct contact
Adhesion can be reliably prevented.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the first to third embodiments and the fifth embodiment
Release sheets 9, 9 in the example₁, 9_Two, 9 _ThreeDissolved in sealant 7
It can be made of a material to be understood. 4th and 5th real
In the embodiment, the release sheet 9₁, 9_Two, 9_ThreeThree layers
However, two or four or more sheets can be laminated.
You.

By the way, in the first to fifth embodiments,
Are the release sheets 9, 9₁, 9_Two, 9 _ThreeUsing sealant
Although the chamber 6 is formed, the release sheets 9 and 9₁, 9_Two, 9
_ThreeA sealant chamber using a liquid release agent instead of
The method is disclosed below.

13 to 19 show a method of forming a sealant chamber using a liquid release agent. FIG. 13 is a cross-sectional view of a wheel on which a tire is mounted, and FIG. FIG. 15 is a second partial view of the tire manufacturing process, and FIG.
6 is an enlarged view in the direction of arrow 16 in FIG. 14, and FIG.
FIG. 18 is an enlarged sectional view taken along line 18-17 of FIG. 14, and FIG. 19 is an enlarged sectional view taken along line 19-19 of FIG.

As shown in FIG. 13, a rim R of a motorcycle wheel has a tubeless tire T comprising a tire body 1 and an inner liner 2 vulcanized and bonded therein.
Is attached. The inner liner 2 includes a peripheral wall 3 formed in a U-shaped cross section including air chamber peripheral walls 3i, 3i located radially inward of the tire T and a sealant chamber peripheral wall 3o located radially outward. Air chamber peripheral wall 3 of peripheral wall 3
A pair of connecting portions connecting i, 3i and the sealing agent chamber peripheral wall 3o are mutually connected by a partition wall 4 formed integrally therewith.

The air chamber 5 having a substantially circular cross section defined between the air chamber peripheral walls 3i, 3i and the partition wall 4 is filled with air, and is defined between the sealant chamber peripheral wall 3o and the partition wall 4. A known liquid sealant 7 is filled in the sealant chamber 6 having a substantially arc-shaped cross section.

The rim R has an annular rim main body 11 extending in the circumferential direction of the tire T, and a pair of flanges extending radially outward from both ends in the width direction of the rim main body 11 to hold the inner periphery of the tire main body 1. 12, 12 are provided. An air valve 13 that fills the air chamber 5 formed inside the inner liner 2 with air is supported through an air valve attachment portion 14 formed at one location in the circumferential direction of the rim main body 11.

Since the sealant chamber 6 of the inner liner 2 is held in a shape along the inside of the tread 15 by the air pressure of the air chamber 5, the tire body 1 is punctured from the radial direction or from the side by a nail or the like. However, the sealant 7 immediately fills and repairs the puncture, and delays the leakage of air from the air chamber 5. Further, since the sealant 7 is held in the sealant chamber 6 and does not flow out to the air chamber 5 side,
There is no clogging of the air valve 13 or the pressure gauge applied thereto.

Next, a manufacturing process of the tire T will be described with reference to FIGS.

The production process of the tire T includes a material kneading process, an inner liner extrusion molding process, a cutting process, a cutting process, a hole making process, a joining process, a liquid releasing agent injection process, a drum winding process, a green tire molding process, It comprises a mold setting step, a vulcanization step, a sealant injection step, a hole closing step, and an inspection step.

First, the material kneaded in the material kneading step is extruded in the inner liner extruding step to form the inner liner 2 made of raw rubber. The inner liner 2 includes a sealant chamber peripheral wall 3o and a pair of air chamber peripheral walls 3 constituting the peripheral wall 3 (see FIG. 13).
i, 3i and the partition wall 4 are integrally provided, and the sealing agent chamber peripheral wall 3o and the partition wall 4 are connected in an annular cross section, and the pair of air chamber peripheral walls 3i, 3i are connected to the connecting portion.
Is connected. Then, in the cutting process, the inner liner 2
Is cut into a predetermined length, and an injection hole 8 is formed in the partition wall 4 of the inner liner 2 in a hole making step.

Subsequently, both ends of the inner liner 2 cut in the cutting step are joined in a joining step to make the inner liner 2 annular. As shown in FIGS. 16 and 17, a holding mold 19 that holds and joins both cut ends of the inner liner 2 includes an upper mold 20 and a lower mold 21 that open and close with each other. To hold in a state in which the inner liner 2 and flatly compressed, the upper die 20 and lower die 21 holding surface 20 ₁ a shallow groove-shaped in the opposite portion of, 21 ₁ are recessed respectively, the holding of the upper die 20 Face 20 ₁
The sealant chamber peripheral wall 3o innerliner 2 with fitted, the air chamber peripheral wall 3i of the inner liner 2 the holding surface 21 ₁ of the lower die 21, 3i and the partition 4 is fitted to.

Subsequently, the liquid release agent 9 is injected into the sealant chamber 6 from the injection port 8 of the partition wall 4 of the inner liner 2 in the liquid release agent injection step. Next, the annular inner liner 2 in which the liquid release agent 9 has been injected into the sealant chamber 6 in the liquid release agent injection step is fitted around the outer periphery of the drum 23 in the drum winding step. Inner liner 2 in process
The raw tire 24 is formed by winding the material of each part of the tire main body 1 around the outside.

As shown in FIG. 18, the raw tire 24
Is a pair of bead portions 26, 26 fitted to the drum 23 so as to be continuous with both ends of the cord portion 25 in the axial direction.
And a tread portion 27 wound so as to cover the cord portion 25 and the bead portions 26 and 26 in the radial direction.

Subsequently, the raw tire 24 removed from the drum 23 is set between the upper mold 29 and the lower mold 30 for vulcanization molding in a mold setting step. Further, in the vulcanization step shown in FIG. 19, the upper mold 29 and the lower mold 30 are heated, and the brother 31 disposed inside the green tire 24 is inflated by air pressure. Mold 30
And vulcanization molding so as to obtain a final product shape.

At this time, the sealant chamber peripheral wall 3o and the partition wall 4 of the inner liner 2 are sandwiched between the expanding brother 31 and the tire body 1 and pressed against each other. The contact surface is not vulcanized and adhered because the liquid release agent 9 adheres thereto, and the contact surface between the sealant chamber peripheral wall 3 o and the tire body 1 where the liquid release agent 9 does not adhere, The air chamber peripheral walls 3i, 3i and the contact surface of the tire main body 1 are vulcanized and bonded. In addition, even if the inner liner 2 is elongated during vulcanization molding, the liquid release agent 9 having fluidity easily fits along the contact surface of the peripheral wall 3o of the sealant chamber and the partition wall 4, so that the peripheral wall 3o of the sealant chamber and the partition wall There is no danger that the contact surface 4 will be vulcanized and bonded. Thus, the sealant chamber 6 defined between the sealant chamber peripheral wall 3o and the partition wall 4 can be formed in an accurate shape.

The total thickness of the sealant chamber peripheral wall 3o and the partition wall 4 of the inner liner 2 is the air chamber peripheral wall 3i, 3
Since the thickness is larger than i, a step occurs at the base of the partition wall 4 (see the enlarged portion in the circle in FIG. 19). In order to absorb the step on the outer surface of the brother 31,
By providing _a tire body 1 sealant chamber peripheral wall 3o, the partition wall 4 and the air chamber peripheral wall 3i, a 3i at equal pressure
Can be pressed against the inner surface of

After the vulcanization molding is completed, the one in which the tire body 1 and the inner liner 2 are integrated is taken out of the mold, and then sealed in the sealant chamber 6 from the inlet 8 of the partition wall 4 in a sealant injection step. The agent 7 is injected. In the subsequent hole closing step, the adhesive tape 32 is attached to the injection port 8 to complete the tire T. In the final inspection step, the finished product is inspected, and all the steps are completed.

Next, a second method for forming a sealant chamber using a liquid release agent will be described with reference to FIG.

The second method of forming a sealant chamber using a liquid release agent is characterized by the shape of the inner liner 2 which is extruded and formed in the inner liner extrusion step. That is, the inner liner 2 is formed of a peripheral wall 3 having an annular cross section.
And a partition wall 4 having an S-shaped cross section for dividing the peripheral wall 3 into two parts. In the cutting step, the inner liner 2
After cutting into a predetermined length, the peripheral wall 3 of the inner liner 2 is cut in the longitudinal direction in the cutting step, whereby the sealant chamber peripheral wall 3o and the pair of air chamber peripheral walls 3i, 3i can be formed. Subsequent steps are the same as in the first method described above.

In the second method of forming the sealant chamber using the above-described liquid release agent, the inner liner 2 forms the bag-shaped sealant chamber 6 defined by the sealant chamber peripheral wall 3 o and the partition wall 4. The sealing agent chamber 6 is defined between the inner liner 2 and the inner surface of the tire body 1 by vulcanizing and bonding both side edges of the sheet-shaped inner liner 2 to the inner surface of the tire body 1. Can be. In this case, the vulcanization step may be performed in a state where the inner liner 2 having the liquid release agent 9 applied to the portion facing the sealant chamber 6 is overlaid on the inner surface of the tire body 1.

[0074]

As described above, according to the first aspect of the present invention, when the inner liner is overlaid on the inner surface of the tire main body before vulcanization molding, the inner liner is separated from the portion facing the sealant chamber. Since the release sheet having moldability is arranged, the vulcanization molding reliably prevents the portion facing the sealant chamber of the inner liner from being vulcanized and bonded,
A portion that does not reach the sealing agent chamber can be securely vulcanized and bonded. Accordingly, the degree of freedom in designing the shape of the sealant chamber is improved, and the sealant chamber can be formed in an accurate shape.

According to the second aspect of the present invention,
Since the release sheet has a part having a releasing property and a part having no releasing property, it is necessary to form a sealant chamber by preventing vulcanization adhesion of the inner liner at the part having the releasing property. The inner liner is vulcanized and adhered to the wall surface of the sealant chamber at a portion having no releasability, thereby preventing the inner liner from being perturbed. In addition, if the part having releasability is a part of one surface of the release sheet, the inner liner is connected to the inner surface of the tire body at that part, and the shape of the sealant chamber can be stabilized.

According to the third aspect of the present invention,
When the sealant is injected into the sealant chamber, the release sheet dissolves in the sealant, so that it is possible to reliably prevent a decrease in sealing performance due to the residual release sheet.

According to the fourth aspect of the present invention,
The release sheet can be reliably dissolved by injecting the sealant.

According to the invention described in claim 5,
The release sheet can be reliably dissolved by injecting the sealant.

According to the invention described in claim 6,
Even if the release sheet is stretched together with the tire body and the inner liner during vulcanization molding, a plurality of release sheets slide on each other at their contact surfaces to prevent breakage of the release sheet. Undesirable vulcanization of the liner can be reliably avoided.

According to the invention described in claim 7,
Even if the release sheet is stretched together with the tire body and the inner liner during vulcanization molding, the release sheet folded in a corrugated shape is freely stretched to prevent breakage, so that undesired vulcanization adhesion between the tire body and the inner liner is prevented. Can be reliably avoided.

According to the invention described in claim 8,
It is possible to provide a high quality sealant-containing tire having a sealant chamber of an accurate shape.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wheel equipped with a tire.

FIG. 2 is a first partial view of a tire manufacturing process diagram.

FIG. 3 is a second partial view of a tire manufacturing process diagram.

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a cross-sectional view of a wheel equipped with a tire according to a second embodiment.

FIG. 7 is a view according to a second embodiment and corresponding to FIG. 4;

FIG. 8 is a cross-sectional view of a wheel on which a tire according to a third embodiment is mounted.

FIG. 9 is a view corresponding to FIG. 4 according to a third embodiment.

FIG. 10 is a view corresponding to FIG. 4 according to a fourth embodiment.

FIG. 11 is a view showing a state at the time of completion of a vulcanization step and at the time of completion of a sealant injection step according to a fourth embodiment.

FIG. 12 is a view corresponding to FIG. 4 according to a fifth embodiment;

FIG. 13 is a cross-sectional view of a wheel equipped with a tire manufactured by the first method of forming a sealant chamber using a liquid release agent.

FIG. 14 is a first partial view of a tire manufacturing process.

FIG. 15 is a second partial view of the tire manufacturing process.

FIG. 16 is an enlarged view taken in the direction of arrow 16 in FIG. 14;

FIG. 17 is a view taken along line 17-17 of FIG. 16;

18 is an enlarged sectional view taken along line 18-18 of FIG.

19 is an enlarged sectional view taken along line 19-19 of FIG.

FIG. 20 is a view corresponding to FIG. 14 showing a second technique for forming a sealant chamber using a liquid release agent;

[Description of Signs] 1 Tire main body 2 Inner liner 2 ₁ First inner liner (Inner liner) 2 ₂ Second inner liner (Inner liner) 6 Sealant chamber 7 Sealant 9 Release sheet 9 ₁ Release sheet 9 ₂ Release Mold sheet 9 ₃ Release sheet 15 Tread

Claims (8)

[Claims] 1. A innerliner to the inner surface of the vulcanization before the tire body (1) (2, 2 _1, 2 ₂₎ the inner liner (2, 2 ₁ by vulcanization molding by superimposing,
At least a portion of 22 ₂ ) is vulcanized and bonded to the inner surface of the tire body ₁ , and a ring-shaped sealant chamber (2, 2 ₁ , 2 ₂ ) partitioned inside the tread 15 by the inner liner 2. 6) A method of manufacturing a tire containing a sealant, the mold release sheet having a releasable property at a portion of the inner liner (2, 2 ₁ , 2 ₂ ) facing the sealant chamber (6) before vulcanization molding. (9, 9 ₁ , 9 ₂ , 9 ₃ ). A method for producing a tire containing a sealant, comprising: 2. At least a part of one surface of the release sheet (9) has releasability, and a part of the release sheet (9) that does not have releasability is sealed during vulcanization molding. The method for producing a tire with a sealant according to claim 1, wherein the tire is vulcanized and bonded to a wall surface of the agent chamber (6). By injection of 3. The release sheet (9 _1, 9 _2, 9 ₃₎ is sealing agent be composed of a dissolvable material in the sealant (7) sealant chamber (6) (7) The method for producing a sealant-containing tire according to claim 1, wherein the tire is dissolved. 4. The release sheet (9 ₁ , 9 ₂ , 9 ₃ ) is made of water-soluble paper or non-woven fabric.
3. The method for producing a tire containing a sealant according to item 1. 5. The method according to claim 3, wherein the release sheets (9 ₁ , 9 ₂ , 9 ₃ ) are films made of natural polysaccharides. 6. A plurality of release sheets (9 ₁ , 9 ₂ ,
9. The method according to claim 1, wherein 9 ₃ ) are stacked and arranged.
3. The method for producing a tire containing a sealant according to item 1. 7. The release sheet (9 ₂ ) is folded in a corrugated shape before vulcanization molding.
₂ ) The method for producing a tire with a sealant according to claim 1, wherein the method is stretched. 8. A tire containing a sealant produced by the production method according to claim 1.