KR101906035B1 - Semi-finished Carcass and the Production Method thereof - Google Patents

Abstract

The present invention relates to a semi-finished carcass and a method of manufacturing the same, in which an electrically conductive tape constituted by a rubber composition containing an electrically conductive material is adhered to a top surface and a bottom surface of a semi- The semi-finished carcass according to the present invention can form the energizing passage connected to the chimney, the belt layer, the carcass layer and the bead portion, so that the energizing performance and the low fuel consumption performance of the tire can be secured at the same time.

Description

Semi-finished Carcass and the Production Method thereof "

The present invention relates to a semi-finished carcass product that forms a carcass ply of a tire and a method of manufacturing the same. More particularly, the present invention relates to a carcass semi-finished product that forms a carcass ply of a tire by attaching a conductive tape to the upper and lower surfaces of the rolled product during carcass rolling, And to a method of manufacturing the same.

The static electricity generated in the vehicle is generated mainly by the friction between the tire and the road surface when the power supply device or the vehicle inside the vehicle is in operation, but may also be caused by the contact between the air and the vehicle body during driving. Such static electricity is uncomfortable when the driver or passenger of the vehicle touches the vehicle, for example, opening the door for boarding the vehicle, and may cause a fire in transportation and gasoline. Further, it causes damage and malfunction of the electronic control unit and the electronic device of the vehicle. Accordingly, tires for grounding or discharging static electricity to the ground have been developed in order to prevent problems and damages caused by static electricity in vehicles.

1 is a side cross-sectional view of a tire in which a current carrying path according to the prior art is formed. 1, a chimney 2 is formed at the center of a tread 1 and a sub tread portion 3, a side wall portion 4, a rim cushion portion 5 ) And the rim portion (6) are formed on the surface of the rim portion (6). Generally, the chimney 2 is made of a rubber containing a conductive material such as carbon black and has conductivity. The tire of this type includes a sub tread portion 3, a side wall portion 4, a rim cushion portion 5, There is a problem that the content of carbon black can not be lowered to a certain level or less in order to secure the conductivity of each of the rim portions 6. In addition, since it requires the use of a specific carbon black, the fuel consumption performance is deteriorated.

Meanwhile, a method has been developed in which a conductive sticker is attached to an outer wall of a tire to form a conductive path to an outer wall of the tire to discharge static electricity accumulated in the vehicle body to the ground. However, this method has a problem in that when the sticker is worn during driving, . In addition, after cutting the carcass, techniques for wrapping the ends of the carcass with conductive rubber at regular intervals have been developed. However, there is a difficulty in manufacturing the carcass to wrap the end of the thin carcass. Step is added to lower the productivity.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a carcass semi-finished product which has a conductive tape adhered to the upper and lower surfaces of a carcass rolled product, The purpose is to provide.

To accomplish the above object, the present invention provides a semi-finished carcass product comprising carcass cords arranged at regular intervals and carcass rolled with body rubber rolled in the width direction of the rolled product, The electrically conductive tape constituted by the rubber composition is attached to the upper surface and the lower surface of the semi-finished carcass at a predetermined interval in the width direction of the carcass rolled product.

In order to accomplish the above object, the present invention provides a method for manufacturing a semi-finished carcass product, comprising the steps of applying a body rubber to a carcass cord and rolling between a pair of rolling rolls, Preparing a carcass rolled product to which an electrically conductive tape composed of a rubber composition containing a substance is adhered;

Cutting the carcass rolled product to a required size; And

And connecting the cut carcass rolled products in the width direction.

In order to accomplish the above object, the tire of the present invention has a skeleton formed by connecting a carcass layer between both bead portions, attaching a tread portion and a sidewall portion to the carcass layer, and arranging the tread portion and the carcass layer Wherein an electrically conductive tape composed of a rubber composition comprising an electrically conductive material is applied to the upper and lower surfaces of the carcass layer, A belt layer, a carcass layer, and a bead portion, which are spaced apart from each other at a predetermined interval in the width direction of the belt.

According to the present invention, the electrically conductive tape is attached to the upper surface and the lower surface of the carcass layer, and the conductive property can be imparted to the entire tire through the conductive path formed in the local region. As a result, a conduction passage connected to the chimney, the belt layer, the carcass layer and the bead portion is formed while maintaining the chimney formed at the center of the tread, thereby ensuring both the electrification performance and the low fuel consumption performance of the tire.

1 is a cross-sectional view of a tire in which a current carrying path according to the prior art is formed.
2 is a reference view showing a manufacturing process of semi-finished carcass according to the present invention.
3 is a side cross-sectional view of a carcass rolled product taken along the line A-A 'in Fig.
Fig. 4 is a reference view showing the cutting process of the carcass rolled product according to the present invention before and after the cutting process.
5 is a cross-sectional view showing a conductive passage of a tire manufactured using semi-finished carcasses according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped. Like reference numerals refer to like elements throughout the specification. The use of the terms " lower " and " upper " herein is based on the direction of the gravitational direction.

2 is a reference view showing a manufacturing process of semi-finished carcass according to the present invention.

2, the carcass semi-finished product 100 according to the present invention includes an upper rolling roll 103 and a lower rolling roll 103 for rolling the body rubber 102 on the carcass cord 101 arranged at regular intervals And the body rubber 102 supplied to the upper rolling roll 103 is rolled on the carcass cord 101 to produce a carcass rolled product having a carcass cord 101, (100) can be produced. In this process, along the rolling direction indicated by the arrow, the electrically conductive tape 105 passes between the upper rolling roll 103 and the upper electrically conductive tape roll 106, and the electrically conductive tape 105 is moved to the lower rolling roll 104 ) And the lower electrically conductive tape roll (107) so that the electrically conductive tape (105) is bonded to the upper and lower surfaces of the carcass rolled product (100).

Since the carcass cord 101 passes through an arrangement roll (not shown) before rolling, the interval between the cords is kept constant. The carcass cord 101 is passed between a pair of rolling rolls 103 and 104 in a state where the carcass cords 101 are arranged at regular intervals and a carcass rolled product The electrically conductive tape 105 is attached to the upper and lower surfaces of the carcass rolled product 100 along the rolling direction.

In the present invention, the upper electrically conductive tape roll 106 rotates in engagement with the upper roll 103 and the lower electrically conductive tape roll 107 rotates in engagement with the lower roll 104. Thereby, the electroconductive tape 105 passes between the upper roll 103 and the upper electroconductive tape roll 106 along the rolling direction, and the electroconductive tape 105 passes between the lower rolling roll 104 and the lower electro- Passes through between the conductive tape rolls 107 and is adhered to the upper and lower surfaces of the carcass rolled product 100 to make rolled carcass rolled product 100.

In the present invention, the electrically conductive tape 105 may be bonded to the carcass rolled product 100 in one line or two lines. In addition, the electrically conductive tape 105 is composed of a rubber and a rubber compound containing an electrically conductive material.

The rubber may be any of those known in the art, but is preferably a natural rubber. Examples of the rubber include acrylonitrile-butadiene rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber Butadiene rubber (BR), isobutylene-isoprene rubber (IIR), and the like.

The electrically conductive material preferably includes carbon black, graphene, graphite, an electrically conductive polymer, or carbon nanotubes.

The rubber compound may further include a polymer including natural rubber (NR) and solution styrene-butadiene rubber (S-SBR).

3 is a side cross-sectional view of a carcass rolled product taken along the line A-A 'in Fig. 3, it can be seen that the electrically conductive tape 105 is attached to the upper surface and the lower surface of the carcass rolled product 100 rolled by covering the body rubber 102 with the carcass cord 101. [ The rolled carcass rolled product 100 thus cut is cut to a predetermined size in the cutting process after winding, and then used as needed. In order to obtain a semi-finished product of the desired size, the carcass rolled product 100 should be connected in the width direction of the rolled product 100. When a carcass having a wide width is required and a cutting joint is used, the carcass rolled product 100 may be connected in the width direction and the carcass cord 101 may be overlapped to form a semi-finished carcass have.

Fig. 4 is a reference view showing the cutting process of the carcass rolled product according to the present invention before and after the cutting process. When the carcass rolled product 100 shown in the left side of FIG. 4 is subjected to a cutting process, the semi-finished carcass product 200 shown in the right side of FIG. 4 is manufactured. According to the carcass semi-finished product 200, the semi-finished carcass is attached with the electrically conductive tapes 105 being spaced apart from each other at a predetermined interval in the tire width direction.

In the semi-finished carcass according to the present invention, the width w of the electrically conductive tape 105 is preferably 5 mm to 20 mm. When the width w is less than 5 mm, the electrification performance is deteriorated and the width of the electrically conductive tape 105 becomes difficult to control in the extrusion process. When the width w is more than 20 mm, the weight of the tire and manufacturing cost increase, do. Further, the distance d between the neighboring electrically conductive tapes 105 is preferably 500 mm to 1000 mm. If the distance d is less than 500 mm, the weight of the tire increases, the manufacturing cost increases, the fuel consumption performance decreases, and if the distance d is 1000 mm or more, the electrically conductive tape 105 is not included, It is not possible to manufacture a tire having the same.

After the rolling process and the cutting process are completed, a green tire having a bead, a carcass, a belt, and the like is completed through a bead process, a band process and a molding process. The green tire is placed in a mold of a vulcanizer, and a certain time is elapsed by applying heat and pressure to produce a tire finished article with a tread.

5 is a cross-sectional view showing a conductive passage of a tire manufactured using semi-finished carcasses according to the present invention. Referring to FIG. 5, a chimney 302 is formed at the center of the tread portion 301. The chimney 302 formed at the center of the tread portion 301 portion is in contact with the belt layer 303 composed of the reinforcing belt 313 and the belt 323 and the belt layer 303 is in contact with the carcass layer 304 The carcass layer 304 surrounds the bead portion 305 and the bead portion 305 is surrounded by the rim cushion 306. The carcass layer 304 has a shape in which the electrically conductive tapes 105 are attached to the upper and lower surfaces of the carcass layer 304 at a predetermined interval in the tire width direction. Thus, a portion of the electrically conductive tape 105 attached to the top and bottom surfaces of the carcass layer 304 may wrap around the bead 305. Thereby, the energizing passages shown by the arrows connected to the chimney 302, the belt layer 303, the carcass layer 304 and the bead portion 305 are formed. The tire according to the present invention includes a four-axis tire tread portion 301 made up of four different kinds of rubber such as tread rubber, tread wing rubber, sub tread rubber and chimney rubber, May be formed, but it is not limited thereto.

According to the present invention, the electrically conductive tape 105 is attached to the upper surface and the lower surface of the carcass layer 304 at a predetermined distance in the tire width direction, Can be given. Thereby, a conduction passage connected to the belt layer 303, the carcass layer 304, and the bead 305 is formed while maintaining the chimney 302 of the four-axis tread portion 301, Fuel ratio performance can be secured at the same time.

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to specific examples. However, these examples are merely for the purpose of understanding the present invention more clearly and do not limit the scope of the present invention.

Example  1: electrically conductive tape adhered Carcass layer  Including tire manufacturing

A carcass cord arranged so as to maintain a constant gap is passed between a pair of rolling rolls, and at the same time, an electrically conductive tape is wound between the upper rolling roll and the upper electroconductive tape roll and between the lower rolling roll and the lower electroconductive tape roll To prepare a carcass rolled product to which an electrically conductive tape was adhered to the upper and lower surfaces of the rolled product.

 The manufactured carcass rolled product was connected in the width direction of the rolled product to form a semi-finished carcass product. Green tire having a bead portion, a carcass and a belt was manufactured through a bead process, a band process and a molding process using the sub tread portion, the side wall portion and the rim cushion portion as the same low fuel consumption rubber as the semi-finished carcass. The prepared green tire was placed in a mold of a vulcanizer, and heat and pressure were applied thereto to produce a tire having a tread for a predetermined time.

Example  2: An electrically conductive tape adhered Carcass layer  Including tire manufacturing

A tire was produced in the same manner as in Example 1, except that the rubber used for the carcass layer, the sub tread portion, the side wall portion, and the rim cushion portion was used as a rubber rubber for normal combustion other than the rubber for low fuel consumption.

Comparative Example  1: Tire manufacturing

Carcass cords arranged so as to maintain a constant gap were passed between a pair of rolling rolls to produce a carcass rolled product. The produced carcass rolled product was connected in the width direction to form a semi-finished carcass. The tire, the sidewall portion, and the rim cushion portion were all used as the same low fuel consumption rubber as the semi-finished carcass, and the green tire having the bead portion, carcass and belt was manufactured through the bead process, the band process and the molding process. The prepared green tire was placed in a mold of a vulcanizer, and heat and pressure were applied thereto to produce a tire having a tread for a predetermined time.

Comparative Example  2: Tire manufacturing

A tire was produced in the same manner as in Comparative Example 1, except that the rubber used for the carcass layer, the sub tread portion, the side wall portion and the rim cushion portion was used as a rubber rubber for normal combustion other than the rubber for low fuel consumption.

The electrical resistance and tire rotation resistance of the tires produced in Examples 1 to 2 and Comparative Examples 1 to 2 were evaluated, and the results are shown in Table 1 below. Rotational resistance means that the lower the value, the more distant you can travel with the same fuel.

Comparative Example 1 Comparative Example 2 Example 1 Example 2 Electrical resistance 37GΩ 54 MΩ 3 MΩ 2 MΩ Tire rotation resistance (RRc) 6.7 8.5 6.7 8.6

According to Table 1, in the case of Comparative Examples 1 and 2 in which the electrically conductive tape is not attached to the upper and lower surfaces of the carcass layer, when the tire is manufactured using the rubber composition for low fuel consumption, the tire has a low fuel consumption performance It can be seen that when the tire is manufactured using a rubber composition which has high electrical resistance and can not ensure the conductivity and has excellent conductivity, it is possible to secure the conductivity, but the low fuel consumption performance is low. On the other hand, according to the first and second embodiments in which the electrically conductive tape is attached to the upper surface and the lower surface of the carcass layer, it is possible to manufacture a tire which not only has excellent electrification performance but also has a low fuel consumption performance.

On the other hand, when a non-energized rubber is used, a large amount of carbon black must be used in order to impart conductivity to the rubber, so that the rotational resistance of the tire deteriorates. According to Example 1 using the electric tape according to the present invention, it is possible to produce a tire having both excellent fuel economy performance and energizing performance because it has high electric conductivity even when rubber that is not energized is used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various changes and modifications may be made therein without departing from the spirit or scope of the invention. The facts will be apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined in the appended claims and their equivalents.

1: Tread 2: Chimney
3: Subtread portion 4: Side wall portion
5: rim cushion part 6: rim part
100: Carcass rolled water 101: Carcass cord
102: Body rubber 103: Top rolling roll
104: Lower rolling roll 105: Electrically conductive tape
106: upper electroconductive tape roll 107: lower electroconductive tape roll
200: Carcass semi-finished product 301: Tread part
302: Chimney 303: Belt layer
304: carcass layer 305: bead portion

Claims (9)

A carcass semi-finished product in which a carcass cord rolled with body rubber placed on a carcass cord arranged at regular intervals is connected in the width direction of the rolled product,
An electrically conductive tape constituted by a rubber composition including an electrically conductive material is attached to the upper and lower surfaces of the carcass semi-finished product at a predetermined distance in the width direction of the tire, and the neighboring electrically conductive tape is spaced apart by a distance d ) Is 500 mm to 1000 mm.
The rubber composition according to claim 1, wherein the rubber composition is selected from the group consisting of acrylonitrile-butadiene rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR), and butyl rubber isobutylene-isoprene rubber, IIR). < / RTI >
The semi-finished carcass according to claim 1, wherein the electrically conductive material is at least one selected from the group consisting of carbon black, graphene, graphite, electrically conductive polymer, and carbon nanotube.
The semi-finished carcass according to claim 1, wherein the width (w) of the electrically conductive tape is 5 mm to 20 mm.
delete The carcass cords are coated with a body rubber and rolled between a pair of rolling rolls so that an electrically conductive tape composed of a rubber composition containing an electrically conductive material is adhered to the upper and lower surfaces of the rolled product along the rolling direction, Producing a cast rolled product;
Cutting the carcass rolled product to a required size; And
And connecting the cut carcass rolled products in the width direction of the carcass rolled product, wherein the electrically conductive tape is applied to the upper and lower surfaces of the semi-finished carcass product in the width direction of the tire Wherein the distance d between the neighboring electrically conductive tapes is 500mm to 1000mm. ≪ RTI ID = 0.0 > 11. < / RTI >
7. The method of claim 6, wherein the step of producing the carcass rolled product comprises passing the electrically conductive tape along the rolling direction between a top roll and an upper electrically conductive tape roll rotating in engagement with the top roll, Passing through a lower electrically conductive tape roll rotating in engagement with said lower rolling roll. ≪ Desc / Clms Page number 20 >
And a belt layer disposed between the tread portion and the carcass layer, the tread portion and the sidewall portion being attached to the carcass layer, Wherein an electrically conductive tape composed of a rubber composition comprising an electrically conductive material is applied to the upper and lower surfaces of the carcass layer at predetermined intervals in the width direction of the tire A belt layer, a carcass layer, and a bead portion, and the distance d between adjacent electrically conductive tapes is 500 mm to 1000 mm.
The tire according to claim 8, wherein a portion of the electrically conductive tape surrounds the bead portion.

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