KR20230055886A - Manufacturing method of tire with improved uniformity and tire thereby - Google Patents

Abstract

The present invention provides a method for manufacturing a tire with improved uniformity and a tire. A method for manufacturing a tire with improved uniformity according to the present invention comprises the steps of: preparing a one side wall rubber semi-finished product by attaching a side wall rubber semi-finished product with an inner liner semi-finished product (S1); wrapping the one side wall rubber semi-finished product on a liner and preparing the other side wall rubber semi-finished product wound in the direction opposite to the winding direction of the one side wall rubber semi-finished product (S2); and overlapping the inner liner semi-finished product of the one side wall rubber semi-finished product with that of the other side wall rubber semi-finished product and winding the same on a molding drum (S3), thereby preventing non-uniformity that occurs in the process of bonding sidewall rubber, an inner liner rubber semi-finished product, etc., during a tire molding process to ensure uniformity of the tire and solving the problem of reduced fuel efficiency due to waste of materials used for excessively overlapping portions and increased weight.

Description

Manufacturing method of tire with improved uniformity and tire thereby

The present invention relates to a method for manufacturing a tire with improved uniformity and a tire using the same, and more particularly, in a tire molding process, non-uniformity occurring in the process of joining sidewall rubber, semi-finished inner liner rubber, etc. is prevented to improve tire uniformity. The present invention relates to a method of manufacturing a tire with improved uniformity that can secure uniformity and solve the problem of waste of materials used in excessively overlapping parts and reduction in fuel efficiency due to weight increase, and a tire using the same.

In general, a pneumatic tire is configured to maximize its intended performance, such as riding comfort, noise, and maneuverability, at an early stage.

Such a pneumatic tire includes an inner liner constituting the inside of the tire, a carcass laminated on the outer circumference of the inner liner, a belt laminated on the outer circumference of the carcass, and a tread laminated on the outer circumference of the belt to substantially contact the ground And, both sidewalls constituting both side parts of the tire, and both beads coupled to the vehicle wheel to provide support for receiving the load of the vehicle and to maintain the internal air pressure of the tire.

Looking at the process of manufacturing such a tire, semi-finished products are manufactured for each of the various components constituting the tire, and these semi-finished products are sequentially wound around a forming drum of a tire building machine and pressed with a compression roll to attach the semi-finished products to each other. A case is manufactured, the green case is put into a curing mold and subjected to a curing process of applying temperature and pressure to the inside of the green case with a bladder, and then a tire that can actually be used is manufactured.

In addition, looking at the green case molding process, the molding is divided into primary molding for molding the first green case and secondary molding for molding the second green case, and shaping for assembling the first green case and the second case. After completing the molding of the final green case through the shaping process, it goes through the vulcanization process.

The first green case refers to a case formed by assembling the inner liner, carcass, bead mounting and turn-up process, and sidewall attachment process using a forming drum and compression roll, and the second green case is a belt, cap It refers to a molded case by assembling plies and treads.

However, in the primary molding process, as the inner liner, carcass, bead, and sidewall separately manufactured as semi-finished products are attached in advance, the productivity in manufacturing each component is lowered, and the components are separately manufactured. When manufacturing, as much of the molding process as the component in the molding process is added, the productivity in manufacturing the green case is also lowered, and uneven bonding is likely to occur in the process of bonding the components, and this uneven bonding part As a result, the uniformity of the tire is deteriorated, resulting in a problem of tire quality deterioration, and excessive overlapping between components occurs, resulting in waste of materials and reduced fuel efficiency due to increased weight. will do

Such a green case molding method is well disclosed in Korean Patent Publication No. 2005-119028.

However, in this conventional manufacturing method, as can be seen in FIG. 6, there will be a width deviation (±a) that can occur when extruding or rolling the inner liner assembly (10) (A), and the side wall assembly (Side assembly 10). , 20), there is a left/right width deviation (±b, ±c) that occurs when extruding (B), and when forming a tire, the inner liner semi-finished product and the sidewall semi-finished product are placed on the forming drum and overlapped ( overlap) (C). At this time, the management standard is set based on the overall pre-assembly width in consideration of tire performance, but each width deviation (±a, ±b, ±c) that exists fundamentally Due to this, when overlapping, the left/right width deviation (left overlap ±a±b, right overlap ±a±c) becomes an uneven semi-finished product (pre-assembly, 30), which eventually lowers the uniformity performance of the tire. will make

In addition, there is a minimum overlap allowable deviation for molding, but unnecessary overlap occurs due to each width deviation (±a, ±b, ±c) that occurred previously, increasing tire weight, and eventually adversely affecting fuel efficiency of the tire. , If you try to attach it by extruding it in one process, there may be a problem that the equipment becomes large or the number of processes increases.

Therefore, the technical problem to be solved by the present invention is to prevent non-uniformity occurring in the process of bonding sidewall rubber, inner liner rubber semi-finished products, etc. in the tire molding process, to secure the uniformity of the tire, and to overlap excessively. It is an object of the present invention to provide a method of manufacturing a tire with improved uniformity that can solve the problem of waste of materials used in a losing part and reduction in fuel efficiency due to an increase in weight, and a tire using the same.

In order to solve the above-described technical problem, the present invention includes a step S1 of preparing a semi-finished side wall rubber by attaching a semi-finished side wall rubber and a semi-finished inner liner, winding the semi-finished side wall rubber around the liner, and Step S2 of preparing the other side wall rubber semi-finished product wound in the opposite direction to the winding direction of the rubber semi-finished product, and S3 step of overlapping the inner liner semi-finished product of the one side wall rubber semi-finished product and the other side wall rubber semi-finished product on a forming drum. It provides a method for manufacturing a tire with improved uniformity.

According to another embodiment of the present invention, the attachment of the side wall rubber semi-finished product and the inner liner semi-finished product may be integrally formed by being extruded with an extrusion fitting.

According to another embodiment of the present invention, the one side wall rubber semi-finished product and the other side wall rubber semi-finished product may be symmetrically supplied to the forming drum and wound.

On the other hand, the present invention provides a tire with improved uniformity characterized in that it is manufactured by the manufacturing method described above in order to solve the above-described technical problem.

According to the manufacturing method of a tire with improved uniformity and the tire according to the present invention, the uniformity of the tire is improved by preventing non-uniformity occurring in the process of bonding sidewall rubber, semi-finished inner liner rubber, etc. in the tire molding process. It is possible to secure and solve the problem of deterioration in fuel efficiency due to waste of materials used in excessive overlapping parts and increase in weight.

1 shows a cross section of a semi-finished product of one side wall rubber according to the present invention;
2 shows a cross section of the other side wall rubber semi-finished product according to the present invention;
3 is a diagram showing a part of an apparatus in which the sidewall rubber semi-finished product and the inner liner semi-finished product of the present invention are integrally extruded,
4 is a diagram showing the shape of the inner liner rubber semi-finished products of the left and right sidewall rubber according to the present invention overlapping and winding on a forming drum;
Figure 5 is a picture taken during the actual process of Figure 4,
Figure 6 is a picture expressing the width deviation that occurs when the conventional inner liner rubber and sidewall rubber are extruded and attached, (A) is a picture showing the width deviation (±a) when extruding or rolling the inner liner semi-finished product, (B ) is a figure showing the left/right width deviation (±b, ±c) that occurs when the sidewall semifinished product is extruded, and (C) is the inner liner semifinished product and the sidewall semifinished product placed on the forming drum when forming a tire. This is a picture showing the width deviation when winding.

Hereinafter, the present invention will be described in more detail.

It should be noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention, and the technical terms used in the present invention are not specifically defined in other meanings in the present invention. Unless otherwise specified, it should be interpreted in a meaning generally understood by those skilled in the art, and should not be interpreted in an excessively comprehensive meaning or in an excessively reduced meaning.

In addition, when the technical terms used in the present invention are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to context, and should not be interpreted in an excessively reduced sense.

In addition, the singular expression used in the present invention includes a plurality of expressions unless the context clearly indicates otherwise. It should not be construed as necessarily including all of the various steps, and it should be construed that some components or some steps may not be included, or additional components or steps may be further included.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

1 shows a cross section of one side wall rubber semi-finished product according to the present invention, FIG. 2 shows a cross section of the other side wall rubber semi-finished product according to the present invention, and FIG. 3 shows a side wall rubber semi-finished product and an inner liner semi-finished product of the present invention Figure 4 is a picture showing a part of the device that is integrally extruded, Figure 4 is a picture showing the shape of the inner liner rubber semi-finished products of the left and right sidewall rubber according to the present invention are overlapped and wound on a forming drum, Figure 5 is the actual process of Figure 4 This is a picture taken during the performance, please refer to it.

A method for manufacturing a tire with improved uniformity according to the present invention includes step S1 of preparing a semi-finished sidewall rubber 300 by attaching a semi-finished sidewall rubber 100 and a semi-finished inner liner 200, and the semi-finished sidewall rubber Step S2 of preparing the other side wall rubber semi-finished product (300′) wound around the liner and wound in the direction opposite to the winding direction of the one side wall rubber semi-finished product, and the inner liner semi-finished product of the one side wall rubber semi-finished product and the other side wall rubber semi-finished product It is characterized in that it includes a step S3 of overlapping and winding on the forming drum 400.

First, step S1 is a process of preparing a semi-finished sidewall rubber by attaching a semi-finished sidewall rubber and a semi-finished inner liner, wherein the semi-finished sidewall rubber is a left sidewall rubber (LS) or a right sidewall rubber (RS). can be used as

Since these sidewall rubbers are symmetrical on the left and right in the case of the same model, if the semi-finished product of the sidewall rubber is arranged on the left side of the tire (when facing the driving direction), it is the left sidewall rubber (LS), and if it is arranged on the right side, it is the right sidewall. It can be determined as rubber (RS).

The semi-finished inner liner 200 preferably has half the thickness of the inner liner rubber to be used, and the semi-finished inner liner rubber 200 of the semi-finished side wall rubber 300 is the other inner liner rubber of the semi-finished side wall rubber 300'. This is because it must overlap with the semi-finished product (200').

Next, in step S2, the one side wall rubber semi-finished product is wound around a liner, and the other side wall rubber semi-finished product 300' is prepared by winding the one side wall rubber semi-finished product in the opposite direction to the winding direction. As can be seen in FIG. 3, the wall rubber semi-finished product 300 includes an inner liner rubber outlet 21 for molding and discharging the inner liner rubber of the extruder body 20 into a predetermined shape, and the inner liner rubber outlet 21 It is formed on one side and has a sidewall rubber discharge port 22 for molding and discharging sidewall rubber into a predetermined shape. It may be integrally formed, and a separate outlet (not shown) adjacent to the inner liner rubber outlet 21 and the sidewall rubber outlet 22 may be provided to extrude the rim flange rubber and the base strip rubber. Of course.

Therefore, when rubber is injected into the inlet of the inner liner rubber outlet 21 and the inlet of the side wall rubber outlets 22 and discharged under pressure, the inner liner rubber and side wall rubber of a predetermined shape can be continuously discharged. By arranging the extrusion joint 30 in front, the rubbers to be extruded under pressure can be molded integrally.

That is, the extrusion jointing mold 30 simultaneously receives and extrudes the inner liner rubber and the side wall rubber discharged from the extruder main body 20, and the side wall rubber is bonded to one side of the inner liner to form a single side wall rubber semi-finished product. (300) can be formed.

The extrusion joint outlet 31 includes an inner liner extrusion area 32 in the center and a side wall extrusion area 33 connected to the inner liner 21 extrusion area so as to communicate with each other, such that the extrusion joint outlet ( 31) is preferably smaller than the total cross-sectional area of the inner liner rubber outlet 21 and the sidewall rubber outlet 22 of the extruder body 20, and is integrally attached with the inner liner through the extrusion joint outlet 31 During extrusion of the sidewall semifinished product, the inner liner rubber and the sidewall rubber may be bonded and integrated by pressing.

That is, when the inner liner and the side wall assembly are to be extruded, the inner liner rubber is molded into a predetermined shape by the extruder body 20 and discharged, and at the same time, the side wall rubber is molded into a predetermined shape on one side thereof. and discharged, and then, by receiving and extruding the inner liner rubber and the side wall rubber through one extrusion bonding discharge port 31, the side walls are bonded to one side of the inner liner by pressurization, so that the inner liner is integrated. And the side wall assembly is formed and can be discharged through the extrusion joint discharge port.

Next, in step S3, the inner liner semi-finished products of the one side wall rubber semi-finished product and the other side wall rubber semi-finished product are overlapped and wound around the forming drum 400.

The inner liner rubber semi-finished product 200 of the one side wall rubber semi-finished product 300 is opposite to the one side wall rubber semi-finished product 300 in order to overlap with the other inner liner rubber semi-finished product 200' of the other side wall rubber semi-finished product 300'. The other side wall rubber semi-finished products (300') wound in the same direction are arranged symmetrically with the one side wall rubber semi-finished products (LS, RS), and the inner liner rubber semi-finished products (200, 200') are wound around the forming drum 400 so that they overlap. .

That is, the left sidewall rubber LS and the right sidewall rubber RS are opposite, and the inner liner rubbers 200 and 200' are overlapped between the forming drum 400 and the compression roll 500 Since it is compressed and attached firmly and closely, there is no possibility of leakage of internal air, and since this feature is compressed and wound with a compression roll, the step difference between the inner liner rubbers (200, 200') can be eliminated, and especially the inner liner rubber It has excellent tack performance and is beneficial for molding.

Accordingly, since the one-side inner liner semi-finished product 200 and the other side liner rubber semi-finished product 200' have half the thickness, design value gauge thickness can be secured by overlapping them.

On the other hand, the tire according to the present invention includes the first molding for forming the first green case including the above-described siding wall rubber and inner liner rubber semi-finished products, and the first green case and the second green case after the second molding for forming the second green case. After completing the molding of the final green case through the shaping process of assembling the secondary case, the finished tire product can be manufactured through the vulcanization process, and since a conventional method can be used, a detailed description will be omitted.

Sidewall rubber semifinished product 100, inner liner semifinished product 200, one sidewall rubber semifinished product 300, the other sidewall rubber semifinished product 300', forming drum 400.

Claims (4)

Step S1 of preparing a side wall rubber semi-finished product by attaching a side wall rubber semi-finished product and an inner liner semi-finished product;
Step S2 of winding the one side wall rubber semi-finished product around a liner and preparing the other side wall rubber semi-finished product wound in the direction opposite to the winding direction of the one side wall rubber semi-finished product;
A method of manufacturing a tire with improved uniformity comprising: overlapping the semi-finished inner liner of the semi-finished sidewall rubber and the semi-finished inner liner of the semi-finished sidewall rubber on the other side and winding them around the forming drum.
According to claim 1,
The method of manufacturing a tire with improved uniformity, characterized in that the attachment of the sidewall rubber semi-finished product and the inner liner semi-finished product is extruded with an extrusion joint die and integrally formed.

According to claim 1,
The method of manufacturing a tire with improved uniformity, characterized in that the one side wall rubber semi-finished product and the other side wall rubber semi-finished product are supplied symmetrically to the forming drum and wound.

A tire with improved uniformity, characterized in that it is manufactured according to any one of claims 1 to 3.

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