KR20220004321A - Pneumatic tire and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a pneumatic tire and a pneumatic tire manufacturing method. Specifically, according to one embodiment of the present invention, the pneumatic tire may be provided, and comprises: a tread which may be in contact with the road surface; a bead provided to be engaged with the rim of a wheel; a sidewall connecting the tread and the bead; and a first colored rubber strip disposed at both ends of the tread in the width direction of the pneumatic tire. An objective of the present invention is to provide a pneumatic tire forming method capable of improving appearance of the pneumatic tire, and the pneumatic tire according thereto.

Description

Pneumatic tire and manufacturing method thereof

The present invention relates to a pneumatic tire and a method for manufacturing the same. More particularly, it relates to a tire capable of displaying various colors on the side portion of the pneumatic tire, and a method for manufacturing the same.

The automobile is an important means of transportation in daily life, and many performance aspects such as driving safety, ride comfort, and noise are required. However, in recent years, not only the performance aspect but also the design of the appearance has become an index for the choice of consumers.

A car's tire is a part of a vehicle, and although it looks very simple, it has numerous functions.

The carcass part of a tire is an important part of the tire's skeleton, and the entire fabric layer made of tire cord paper is called a carcass, and it plays a role in resisting the internal air pressure, load, and impact.

The side part of the tire is the side part of the tire, and it is the part between the shoulder part and the bead part, which protects the carcass and improves the riding comfort by performing flexible bending and stretching movements. Various characters such as , manufacturer, and brand name are displayed.

As such, it can be said that the side part of the tire plays an important role in the design of the tire with the purpose of protecting the carcass cord, which has a great influence on the structure.

Conventional tires have been manufactured by inserting a back frame into the side part to improve the appearance of the tire. there is no situation.

Embodiments of the present invention were invented against the background as described above, and a method for forming a pneumatic tire capable of improving the appearance of a pneumatic tire by applying a colored rubber strip to the side portion of the pneumatic tire, and according to this We would like to provide pneumatic tires.

According to an aspect of the present invention, a tread that can be in contact with the road surface; a bead provided to be engaged with the rim of the wheel; a sidewall connecting the tread and the bead; And, in the width direction of the pneumatic tire, there may be provided a pneumatic tire comprising a first color rubber strips disposed on both ends of the tread.

In addition, the first colored rubber strip may further include a second colored rubber strip disposed on the sidewall spaced apart a predetermined distance in the radial direction of the pneumatic tire.

In addition, the refining process of blending the raw material of the tire; a rolling and extrusion process of manufacturing the mixed rubber after the refining process into a semi-finished product including a semi-finished tread product and a semi-finished sidewall product; Cutting process of cutting the semi-finished product after the rolling and extrusion process to a predetermined size; a molding process of molding the semi-finished product after the cutting process to a predetermined size; and a vulcanization process of imparting elasticity to the molded product made by the molding process by applying heat and pressure, wherein the molding process attaches the first color rubber strip to the end of the semi-finished tread product, and the semi-finished sidewall product has the first color manufacturing a pneumatic tire comprising a step of molding to cover the rubber strip, wherein after the vulcanization step, the first color rubber strip can be exposed to the outside by removing at least a portion of the half-finished sidewall product A method may be provided.

The rubber may include a sidewall rubber, and the rolling and extrusion process may further include a step of adding the second color rubber strip to the sidewall rubber.

The first color rubber strip and the second color rubber strip may have different colors.

According to embodiments of the present invention, there is an effect that the exterior design can be further upgraded by applying a color to the tread and sidewall of the pneumatic tire.

1 is a cross-sectional view illustrating a state in which semi-finished products of a pneumatic tire are stacked in a manufacturing method according to an embodiment of the present invention.
2 is a cross-sectional view of a pneumatic tire manufactured according to an embodiment of the present invention.
3 and 4 are views showing an example of adding a color rubber strip to apply a TOS (tread over side) type molding process.

Hereinafter, specific embodiments for implementing the technical idea of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, when it is said that a component is 'connected', 'supported', 'connected', 'supplied', 'transferred', or 'contacted' to another component, it is directly connected, supported, connected, It should be understood that supply, delivery, and contact may occur, but other components may exist in between.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, the expressions of the upper side, the lower side, the side, etc. are described with reference to the drawings, and it is to be noted in advance that if the direction of the corresponding object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Hereinafter, a pneumatic tire and a manufacturing method therefor according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

First, as shown in FIG. 2 , a pneumatic tire 10 according to an embodiment of the present invention includes an inner liner 1 for forming an air receiving part, a tread 2 in contact with the road surface, and the tread 2 . Belt (3) including at least one layer and tread (2) including at least one layer to increase abrasion resistance by minimizing movement and prevent rapid deformation of the center of the tire Wall (7), carcass (4) provided on the inside of the tread part (2) to contribute to maintaining the shape of the pneumatic tire, a bead (6) and a bead (6) providing rigidity for fixing the pneumatic tire to the rim ( 6) may include an apex 5 provided on the upper side.

At least one layer of belt 3 may be provided on the inner circumferential surface of the tread 2 . The belt 3 may be provided between the tread 2 and the carcass 4 serving as a skeleton of the pneumatic tire 10 .

The belt 3 is provided with a special cord paper to relieve external shock, and it is possible to prevent cracks or trauma generated in the tread 2 from being directly transmitted to the carcass 4 .

A carcass 4 may be provided on the inner circumferential surface of the belt 3 . The carcass 4 is provided to form the skeleton of the pneumatic tire 10, and may be manufactured using metal or synthetic fibers. In other words, since the carcass 4 refers to the cord layer inside the pneumatic tire 10 and serves to support the load and absorb the impact, it can be provided with a material strong in resistance to fatigue against the flexural movement. have.

An inner liner 1 may be provided on the inner circumferential surface of the carcass 4 . The inner liner 1 may serve to maintain the pressure of the air filled inside the pneumatic tire 10 . To this end, the inner liner 1 may be provided with a rubber layer having excellent airtightness. For example, the inner liner 1 may be made of high-density butyl rubber or the like.

The bead 6 may comprise one or more wires, cords, cores, and the like. The bead 6 serves to mount the pneumatic tire 10 on the rim, and may have a circular ring shape.

The apex is provided on the upper side of the bead 6 and serves to alleviate the shock received by the bead so that the disorder of the bead can be minimized.

The sidewall 7 connects the tread 2 and the bead 6 . The sidewall 7 elastically deforms the shock received by the tread unit 2 from the road surface, absorbs the shock, and serves to secure resistance, durability, and driving stability of the pneumatic tire 10 .

In addition, in the pneumatic tire 10 according to an embodiment of the present invention, in the width direction of the pneumatic tire 10 , the first color rubber strips 8 and the first color are disposed at both ends of the tread 2 . It may further include a second color rubber strip 9 disposed on the sidewall 7 spaced apart from the rubber strip 8 by a predetermined distance in the radial direction of the pneumatic tire 10 .

As shown in FIG. 2 , the first colored rubber strip 8 has a substantially triangular cross-sectional shape when viewed in the circumferential direction of the pneumatic tire, and has a first surface 8 in contact with the body of the tread 2 . -1), the second surface 8-2 exposed to the outside, and the third surface 8-3 in contact with the sidewall 7 may be formed.

The first surface 8 - 1 may be continuous along the boundary line between the tread 2 and the inner surface of the sidewall 7 . The second surface 8-2 is continuous with the outer surface of the sidewall 7 in contact with it, and may form a continuous curved surface at the boundary line thereof. For example, the second surface 8 - 2 and the sidewall 7 in contact therewith may have the same curvature. In addition, the second surface 8 - 2 may form a continuous curved surface with the outer surface of the second color rubber strip 9 .

All or part of the third surface 8 - 3 may be covered by the end of the tread body of the sidewall 7 on the side of the outer surface (table in contact with the road surface).

Meanwhile, a manufacturing method for manufacturing a pneumatic tire as shown in FIG. 2 includes a refining process of blending raw materials of the tire; a rolling and extrusion process for producing a semi-finished rubber compounded after the refining process; Cutting process of cutting the semi-finished product after the rolling and extrusion process to a predetermined size; a molding process of molding the semi-finished product after the cutting process to a predetermined size; And it may include a vulcanization process for imparting elasticity by applying heat and pressure to the molded product made by the molding process.

Since the refining process, rolling and extrusion process, cutting process, forming process, and vulcanization process of pneumatic tires are generally known methods, detailed descriptions of each process will be omitted, and the focus will be on the method of adding color to the tire during the tire manufacturing process. Explain.

First, semi-finished products that have undergone rolling, extrusion and cutting processes are inner liner (1), tread (2), belt (3), carcass (4), apex ( apex) 5 , a bead 6 , a side wall 7 , a first color rubber strip 8 and a second color rubber strip 9 .

Semi-finished products that have undergone rolling, extrusion, and cutting processes may be stacked at predetermined positions, as shown in FIG. 1 . In other words, the bead 6 may be disposed on the upper surface of the carcass 4 , and the inner liner 1 may be disposed on the lower surface of the carcass 4 . In addition, the sidewall 7 may be disposed on the lower surface of the inner liner 1 , and the tread 2 may be disposed on the upper surface of the belt 3 .

Meanwhile, the forming process according to an embodiment of the present invention uses a forming method (hereinafter, SOT method) in which a sidewall of a tire covers an end of a tread when manufacturing a tire.

In other words, in the general tire manufacturing process, each semi-finished product is combined to form a green case, which is the previous stage of the vulcanization process to make a finished tire. At this time, as in the embodiment of the present invention, the method of forming the tire is largely the SOT (side over tread) method in which the sidewall of the tire covers the end of the tread, and in contrast to the SOT method, the end of the tread is the sidewall. There is a TOS (tread over side) scheme that covers the end of the month.

The molding process according to an embodiment of the present invention is performed according to the SOT method, and a process of attaching a colored rubber strip to the top of the extruded tread extruded in the same manner as in the prior art may be added.

In the molding process according to an embodiment of the present invention, as shown in FIG. 1 , a first color rubber strip 8 is attached to both ends of the tread 2 extruded as a semi-finished product, and as shown in FIG. Similarly, a molding method in which the sidewall 7 thinly covers the first color rubber strip 8 is used.

Thereafter, through a vulcanization process, the first colored rubber strip 8 may be exposed to the outside by removing at least a portion of the sidewall 7 , for example, by grinding.

In addition, the second colored rubber strip 9 attached to the side wall 7 may be extruded together by disposing the colored rubber strip semi-finished rubber on the rubber for the side wall semi-finished product at a predetermined position during the extrusion process.

The position of the second colored rubber strip 9 attached to the sidewall 7 may be adjusted in consideration of the position at which the color is to be displayed on the side of the finished tire. 1 shows an example in which the second color rubber strip 9 is provided in the middle part of the sidewall 7, and in the case of a finished tire after the forming process, the second color rubber strip 9 is placed at the position as shown in FIG. Two color rubber strips 9 may be arranged.

Through this process, the first colored rubber strip 8 is attached to the position as shown in FIG. 1 , and the first colored rubber strip 8 attached to the tread 2 and the sidewall 7 are The exterior design can be beautifully designed while exposing the attached second color rubber strip 9 through grinding.

In addition, the first color rubber strip and the second color rubber strip may have various colors according to a desired exterior design. The first color rubber strip and the second color rubber strip may have different colors from that of the tread body and the sidewall portion. For example, the first color rubber strip and the second color rubber strip may be of a color other than black.

Hereinafter, the effect of the tire manufacturing method as described above will be described.

As the molding method according to an embodiment of the present invention applies the SOT method, the tread extrusion method is the same as in the prior art, and only a colored rubber strip is added to the top of the tread extrudate, so that it is easy to apply in the process.

When a colored rubber strip is attached to the top of the tread extrudate and molded in the SOT method together with the conventional method of adding a colored rubber strip to the sidewall extrudate, the colored rubber strip is attached to the tread extrudate and the sidewall extrudate. do. If the green case molded in this way is vulcanized, the color can be implemented on the sidewall or the desired position, and the color can also be implemented on the shoulder deco position of the tread. In this way, it is possible to design the side of the tire to show it attractively to consumers.

In particular, since it can be molded in the SOT (side over tread) method, there is an effect that the exterior design can be further upgraded by applying the color to the tread decoration part, which is difficult to apply in the conventional method.

Contrary to this, in the case of the TOS molding method, if the colored rubber strip is to be attached to the tread, the colored rubber strip must be attached to the surface of the extruded tread, which causes difficulties in the process. In addition, in the case of the TOS molding method, a method of extruding including a colored rubber strip when extruding the tread without attaching a colored rubber strip to the surface of the tread extrudate may be considered. However, even in this case, as shown in FIG. 3, the conventional process of simultaneously extruding the cap tread 21, the lower tread 23, and the wing strip 22 4, including a cap tread (Cap Tread) 21, a lower tread (Under Tread) 23, a wing strip (22) as well as a colored rubber strip (24), as shown in FIG. There is a difficulty in the process because it must be changed to a process of co-extruding different types of rubber.

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed as having the widest scope according to the technical idea disclosed in the present specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

1: Inner liner
2: tread
3: Belt
4: carcass
5: Apex
6: Bead
7: side wall
8: first color rubber strip
8-1: 1st side
8-2: 2nd side
8-3: 3rd side
9: Second color rubber strip
10: pneumatic tire

Claims (5)

a tread that may be in contact with the road surface;
a bead provided to be engaged with the rim of the wheel;
a sidewall connecting the tread and the bead; and,
In the width direction of the pneumatic tire, including first colored rubber strips disposed on both ends of the tread,
pneumatic tires. 3. The method of claim 2,
Further comprising a second color rubber strip disposed on the sidewall spaced a predetermined distance from the first color rubber strip in the radial direction of the pneumatic tire,
pneumatic tires. 3. A method for manufacturing a pneumatic tire for manufacturing the tire of claim 2, comprising:
refining process of blending raw materials for tires;
a rolling and extrusion process of manufacturing the mixed rubber after the refining process into semi-finished products including semi-finished tread products and semi-finished sidewall products;
Cutting process of cutting the semi-finished product after the rolling and extrusion process to a predetermined size;
a molding process of molding the semi-finished product after the cutting process to a predetermined size;
Including a vulcanization process for imparting elasticity by applying heat and pressure to the molded product made by the molding process,
The forming process includes attaching the first colored rubber strip to the end of the semi-finished tread, and molding the semi-finished sidewall product to cover the first colored rubber strip,
After the vulcanization process, the first color rubber strip further comprises a process in which at least a part of the sidewall semi-finished product can be exposed to the outside.
How to make a pneumatic tire. 4. The method of claim 3,
The rubber includes a sidewall rubber,
The rolling and extrusion process further comprises a process of adding the second color rubber strip to the sidewall rubber.
How to make a pneumatic tire. 5. The method of claim 4,
The first color rubber strip and the second color rubber strip have different colors from each other.
How to make a pneumatic tire.

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