KR102232829B1 - Method of manufacturing pneumatic tire and pneumatic tire manufactured by the same - Google Patents

Abstract

According to one embodiment of the present invention, provided is a method of manufacturing a pneumatic tire, comprising the following steps of: forming a coating layer containing sulfur chloride on one surface of a carcass semi-finished product; laminating the carcass semi-finished product and an inner liner with the coating layer interposed therebetween; forming one sheet by performing a rolling process on the inner liner and the carcass semi-finished product; cutting the sheet; forming a cylindrical structure by bonding both ends of the cut sheet; manufacturing a green tire by molding the cylindrical structure; and curing the green tire.

Description

Manufacturing method of pneumatic tires and pneumatic tires manufactured using the same {METHOD OF MANUFACTURING PNEUMATIC TIRE AND PNEUMATIC TIRE MANUFACTURED BY THE SAME}

Embodiments of the present invention relate to a method of manufacturing a pneumatic tire and a pneumatic tire manufactured using the same.

The inner liner of the tire is located at the innermost part of the tire structure, and when attached to the car, air does not leak from the tire and rim and maintains the inflation pressure in the tire. Accordingly, the rubber composition for a tire inner liner is required to have air permeability. For this purpose, butyl rubber is generally used. Since this butyl-based rubber serves to prevent air permeation into the inside of the tire, it can be said that the degree of air permeability of the inner liner is directly related to the durability of the tire.

Tires are manufactured through a vulcanization process after laminating the above-described inner liner on a carcass forming a skeleton of a tire, and there is a problem in that an inner liner having fluidity penetrates into the carcass during the vulcanization process.

Embodiments of the present invention provide a method of manufacturing a pneumatic tire that prevents penetration of an inner liner into a carcass in a curing process, and a pneumatic tire manufactured using the same.

In an embodiment of the present invention, the step of forming a coating layer containing sulfur chloride on one side of a semi-finished carcass, laminating the semi-finished carcass and an inner liner with the coating layer interposed therebetween, the inner liner and the carcass The semi-finished product is subjected to a rolling process to form a single sheet, cutting the sheet, forming a cylindrical structure by bonding both ends of the cut sheet, and forming the cylindrical structure to form a green tire. It provides a method of manufacturing a pneumatic tire, comprising the step of manufacturing a) and curing the green tire.

In an embodiment of the present invention, the forming of the coating layer may be a step of forming by applying a coating solution containing sulfur chloride on one surface of the semi-finished carcass.

In an embodiment of the present invention, the forming of the coating layer may further include drying at room temperature after applying the coating solution.

In one embodiment of the present invention, the coating liquid may include 1 to 5 parts by weight of sulfur chloride and 0.1 to 3 parts by weight of zinc soap, based on 100 parts by weight (phr) of raw rubber.

In one embodiment of the present invention, the coating solution is mercaptobenzothiazole, dithiobisbenzothiazole, N-cyclohexylbenzothiazole, N-tert-butyl- Benzothiazole-sulfenamide (N-tert-butyl-benzothiazol sulfonamide), N,N'-diphenylguanidine, N-dicyclohexylbenzothiazole-2-sulfenamide (N- A vulcanization accelerator containing at least one compound selected from the group consisting of dicyclohexylbenzothiazole-2-sulfenamide) may further include 0.1 to 5 midrange portions.

An embodiment of the present invention provides a pneumatic tire manufactured by any one of the above-described methods for manufacturing a pneumatic tire.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

In the method of manufacturing a pneumatic tire according to the embodiments of the present invention, a coating layer containing sulfur chloride is formed on one surface of the carcass layer and the carcass layer before the inner liner vulcanization. Inner liner penetration can be effectively prevented. Through this, the method of manufacturing a pneumatic tire can reduce defects during tire manufacturing and increase durability to prevent accidents during driving.

1 is a perspective view schematically showing a pneumatic tire according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.
3 is a flowchart sequentially showing a method of manufacturing a pneumatic tire according to an embodiment of the present invention.
4 is a diagram schematically illustrating a phenomenon in which an inner liner penetrates into a carcass layer when manufactured by a conventional pneumatic tire manufacturing method.
5A to 5C are conceptual diagrams sequentially showing a method of manufacturing a pneumatic tire according to an embodiment of the present invention.

Since the present invention can apply various transformations and have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. Effects and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, the same or corresponding constituent elements are assigned the same reference numerals, and redundant descriptions thereof will be omitted. .

In the following embodiments, terms such as first and second are used for the purpose of distinguishing one constituent element from other constituent elements rather than a limiting meaning.

In the following examples, expressions in the singular include plural expressions unless the context clearly indicates otherwise.

In the following embodiments, terms such as include or have means that the features or elements described in the specification are present, and do not preclude the possibility of adding one or more other features or components in advance.

In the drawings, components may be exaggerated or reduced in size for convenience of description. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and thus the present invention is not necessarily limited to what is shown.

Hereinafter, with reference to the drawings, a method of manufacturing a pneumatic tire according to an embodiment of the present invention and a pneumatic tire manufactured using the same will be described.

1 is a perspective view schematically showing a pneumatic tire according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.

1 and 2, the pneumatic tire 100 includes a tread part 110 and a side wall part 120 extending from both sides of the tread part 110, and a bead part provided at the end of the side wall part 120. 130 and a carcass layer 40 may be included. In addition, the pneumatic tire 100 may include an inner liner 23 positioned inside the tread portion 110 and the pair of sidewall portions 120 to maintain the internal air pressure of the tire 100. In addition, the tire 100 may include a belt layer 24 and a carcass layer 40 positioned under the tread portion 110, and a cap ply between the tread portion 110 and the belt layer 24 May be further included.

The tread part 110 is made of a thick rubber layer and transmits the driving force and braking force of the vehicle to the ground. Tread patterns 114 for steering safety, traction, and braking and blocks 116 partitioned by the tread patterns 114 may be positioned on the surface of the tread unit 110. The tread patterns may include a plurality of grooves for drainage when driving on a wet road surface and sipes for improving traction and braking power. The groove may include a circumferential groove that coincides with the driving direction of the vehicle and a lateral groove between the circumferential groove. The sipe is formed in the block and may be a groove having a size smaller than that of the groove. The sipe serves to break the water film by absorbing moisture when driving on a wet road surface, thereby increasing the driving force and braking force of the pneumatic tire 100. The block 116 is an area that occupies most of the tread unit 110 and directly contacts the ground to transmit the driving force and braking force of the vehicle to the ground.

The sidewall part 120 is disposed extending downward from the end of the tread part 110. The sidewall part 120 is a side part of the pneumatic tire 100, protects the carcass layer 40, provides lateral stability of the pneumatic tire 100, and increases riding comfort by performing a flexion exercise. In addition, the sidewall part 120 serves to transmit the torque of the engine received through the drive shaft to the tread part 110.

The bead part 130 is provided at the end of the sidewall part 120 and serves to mount the pneumatic tire 100 on the rim. The bead part 130 may include a bead core 132 formed by twisting a plurality of rubber-coated steel wires and a bead apex 134 attached to the bead core 132.

The carcass layer 40 forms the skeleton of the pneumatic tire 100, withstands the load, impact, and the like that the pneumatic tire 100 receives, and maintains the pneumatic pressure of the pneumatic tire 100. The carcass layer 40 may be formed by overlapping a plurality of cord papers made of high-strength fiber organic materials such as steel or polyester, rayon, etc., and then coating them with rubber and rolling. The carcass layer 40 may extend along the tread portion 110, the sidewall portion 120 and the bead portion 130.

The belt layer 24 between the tread part 110 and the carcass layer 40 reduces road impact when the vehicle is running, widens the area of the tread part 110 in contact with the road surface to improve driving stability. Separation of the part 110 and the carcass layer 40 can be prevented. The belt layer 24 may be formed by rolling a plurality of belt cords made of steel with rubber.

A cap ply may be further included between the tread part 110 and the belt layer 24. The cap ply is a special cord attached on the belt layer 24 to improve performance during driving. The cap ply may include, for example, polyester synthetic fibers.

The inner liner 23 is a layer that prevents air leakage from the pneumatic tire 100 instead of a tube, and may be formed of a rubber layer having excellent sealing properties. As an example, the inner liner 23 may be made of butyl rubber having a high density, and the pneumatic pressure in the pneumatic tire 100 may be maintained.

The manufacturing method of a pneumatic tire according to an embodiment of the present invention is to vulcanize a green tire in which a semi-finished carcass and an inner liner 23 are stacked to provide air with the carcass layer 40 and the inner liner 23. In manufacturing the mouth tire 100, it may include a process of surface vulcanizing one surface of the semi-finished carcass at room temperature. Here, the semi-finished carcass means a state before vulcanization, and the carcass layer 40 means a vulcanized state, but hereinafter, for convenience of explanation, the semi-finished carcass is given the same reference numeral as the carcass layer and described. It should be.

3 is a flowchart sequentially showing a method of manufacturing a pneumatic tire according to an embodiment of the present invention. 4 is a diagram schematically showing a phenomenon in which the inner liner penetrates into the carcass layer when manufactured by a conventional pneumatic tire manufacturing method, and FIGS. 5A to 5C are air according to an embodiment of the present invention. It is a conceptual diagram showing in order of the manufacturing method of the mouth tire

First, referring to FIG. 4, in the conventional method of manufacturing a pneumatic tire, a carcass semi-finished product 40 and an inner liner 23 are stacked, and then a pneumatic tire is manufactured through a vulcanization process. Here, the curing process means a process of completing the shape of the tire by inflating the internal brada while heating the green tire including the semi-finished carcass 40 and the inner liner 23. At this time, the carcass semi-finished product 40 and the inner liner 23 made of rubber have fluidity generated by a vulcanization process that involves heating, and the rubber of the inner liner 23 is changed to the carcass semi-finished product 40 due to the expansion of Brada. There was a problem of penetrating between the codes 41 of ).

The manufacturing method of a pneumatic tire according to an embodiment of the present invention is to solve this problem, characterized by performing a curing process by curing one side of the semi-finished carcass 40 at room temperature and then laminating it with an inner liner. do.

Referring to FIGS. 3, 5A and 5B, first, in a method of manufacturing a pneumatic tire, a coating layer 50 containing sulfur chloride is formed on one surface A1 of the semi-finished carcass 40 (S10). In general, the vulcanization of tire rubber proceeds at a temperature of 150° C. or higher, while the coating layer 50 containing sulfur chloride is vulcanized at room temperature. In other words, before the vulcanization process is performed on the semi-finished carcass 40 and the inner liner 23, one side A1 of the semi-finished carcass 40 is first vulcanized at room temperature. It becomes possible to prevent penetration.

As an embodiment, the step of forming the coating layer 50 may be formed by applying a coating solution containing sulfur chloride on one surface A1 of the semi-finished carcass 40. Here, the coating liquid may include 1 to 5 parts by weight of sulfur chloride and 0.1 to 3 parts by weight of zinc soap based on 100 parts by weight (phr) of the raw rubber. In addition, the coating solution is mercaptobenzothiazole, dithiobisbenzothiazole, N-cyclohexylbenzothiazole, N-tert-butyl-benzothiazole-sulfenamide (N -tert-butyl-benzothiazol sulfonamide), N,N'-diphenylguanidine (N,N'-diphenylguanidine), N-dicyclohexylbenzothiazole-2-sulfenamide (N-dicyclohexylbenzothiazole-2-sulfenamide) It may further include 0.1 to 5 parts by weight of a vulcanization accelerator comprising at least one compound selected from the group.

At this time, mercaptobenzothiazole is represented by the following formula (1), dithiobisbenzothiazole (dithiobisbenzothiazole) is represented by the following formula (2), N-cyclohexylbenzothiazole (N-Cyclohexylbenzo thiazole) is It may be represented by the following formula (3). In addition, N-tert-butyl-benzothiazol sulfonamide (N-tert-butyl-benzothiazol sulfonamide) is represented by the following formula (4), N,N'-diphenylguanidine (N,N'-diphenylguanidine) is Represented by the following formula (5), N-dicyclohexylbenzothiazole-2-sulfenamide (N-dicyclohexylbenzothiazole-2-sulfenamide) may be represented by the following formula (6).

More specifically, the coating solution is a mixture of 1 to 5 parts by weight of sulfur chloride, 0.1 to 3 parts by weight of zinc soap, and 0.1 to 5 parts by weight of a vulcanization accelerator in benzene as a solvent based on 100 parts by weight (phr) of the above-described raw rubber. It can be prepared by dilution from% to 98%. For example, the coating solution may have a composition obtained by mixing 20 ml to 50 ml of the mixture on a 1 L basis with 980 ml to 950 ml of benzene.

In the method of manufacturing a pneumatic tire, the above-described coating solution may be evenly applied to one side A1 of the semi-finished carcass 40, and then dried at room temperature (20°C±5°C) so that benzene, which is a solvent, can be evaporated. In the process of drying the coating liquid at room temperature, vulcanization occurs to form the coating layer 50, which is an anti-penetration layer capable of preventing the inner liner 23 from penetrating.

Thereafter, the dried semi-finished carcass 40 may be rolled up and stored for a cutting or forming step. At this time, the storage process is stored at room temperature or below room temperature, and the storage period may be from 24 hours to 48 hours, and for example, it may be stored so as not to exceed 48 hours.

Next, referring to FIGS. 3 and 5C, in the manufacturing method of a pneumatic tire, a semi-finished carcass 40 and an inner liner 23 are stacked with a coating layer 50 interposed therebetween (S20), and an inner liner 23 ) And the carcass semi-finished product 40 may be subjected to a rolling process to form a single sheet (S30). Thereafter, the sheet is cut (S40), and the cylindrical structure is formed by bonding both ends of the cut sheet (S50), and then the cylindrical structure is formed to manufacture a green tire (S60). Thereafter, the green tire is vulcanized (S70) to complete the pneumatic tire.

As described above, in the manufacturing method of a pneumatic tire according to the embodiments of the present invention, a coating layer containing sulfur chloride is formed on one surface of the carcass layer and the carcass layer before the inner liner vulcanization, so that during the curing process of the green tire It is possible to effectively prevent the penetration of the inner liner into the carcass layer. Through this, the method of manufacturing a pneumatic tire can reduce defects during tire manufacturing and increase durability to prevent accidents during driving.

As described above, the present invention has been described with reference to an embodiment shown in the drawings, but this is only exemplary, and it will be appreciated by those of ordinary skill in the art that various modifications and variations of the embodiment are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: tire
110: tread part
120: side wall part
130: bead part

Claims (6)

Forming a coating layer containing sulfur chloride on one side of the semi-finished carcass;
Laminating the semi-finished carcass and an inner liner with the coating layer interposed therebetween;
Forming a single sheet by performing a rolling process on the inner liner and the semi-finished carcass;
Cutting the sheet;
Bonding both ends of the cut sheet to form a cylindrical structure;
Forming a green tire by molding the cylindrical structure; And
Including; curing the green tire
The step of forming the coating layer,
Forming a coating solution containing sulfur chloride on one surface of the semi-finished carcass; And
And drying at room temperature after applying the coating layer to first vulcanize one side of the semi-finished carcass. delete delete The method of claim 1,
The coating solution comprises 1 to 5 parts by weight of sulfur chloride and 0.1 to 3 parts by weight of zinc soap based on 100 parts by weight (phr) of raw rubber. The method of claim 4,
The coating solution is mercaptobenzothiazole, dithiobisbenzothiazole, N-cyclohexylbenzo thiazole, N-tert-butyl-benzothiazole-sulfenamide (N- tert-butyl-benzothiazol sulfonamide), N,N'-diphenylguanidine (N,N'-diphenylguanidine), N-dicyclohexylbenzothiazole-2-sulfenamide (N-dicyclohexylbenzothiazole-2-sulfenamide) A method of manufacturing a pneumatic tire further comprising 0.1 to 5 middle vulcanization accelerators comprising at least one compound selected from. A pneumatic tire manufactured by the method of manufacturing a pneumatic tire according to any one of claims 1, 4 and 5.

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