KR20090055785A - Code for tire carcass weft with hybrid code, tire carcass and tire comprising the same - Google Patents

Abstract

Cord for carcass weft made of hybrid cord, a tire carcass and a radial tire including the same are provided to improve durability and control stability of a tire with excellent modulus in low and high temperature. Code for carcass weft of a tire carcass is made of hybrid cord of high modulus and low modulus. The high modulus cord of the hybrid is 20 g/denier or greater. The low modulus cord is 2~ 12 g/denier. The high modulus cord is one or more among layon, PBO, aramid, polyvinyl alcohol or carbon fiber. The low modulus cord is one or more among nylon 6, nylon 66, or nylon 46. The tire includes a rubber layer(1), a reinforced belt layer(2), a belt layer(3,4), and a carcass layer(5).

Description

Code for tire carcass weft with hybrid code, tire carcass and tire comprising the same}

The present invention relates to a carcass weft thread cord made of a hybrid cord, a tire carcass comprising the same, and a radial tire applying the same. More specifically, a carcass weft cord made of a high modulus and a low modulus hybrid cord, It relates to a tire carcass including the same and a pneumatic tire for a passenger car to which the tire carcass is applied.

In a tire, a belt is a very important factor that distributes the stress transmitted from the ground while driving and maintains the tire's grounding shape so that it has excellent driving, wear and braking performance. Particularly, the reinforcing belt catches the flow of the belt and maintains the optimum belt shape when the tire is running, so that the tire always maintains a good belt shape and has good tire performance.

The main characteristics required for these reinforcement belt cords are heat resistance, shrinkage, modulus at room temperature and high temperature. Among them, the heat-resisting adhesive force is the property that is most related to the durability of the tire because it is located between the tread and the belt that generate the most heat in the tire due to the nature of the position where the reinforcing belt is used, and is subject to aging due to high temperature during driving. have.

In addition, modulus is generally a physical property highly correlated with ride comfort, steering stability, and the like. In other words, a tire cord with a large modulus plays an advantageous role in reducing the change in the shape of the belt due to the force transmitted from the outside, and the shape maintenance from the external force can maintain the performance of the originally designed tire. affect.

Another factor that can affect the running performance of the tire is the heat generated when the tire is running. In general, all materials decrease in modulus with increasing temperature. The modulus of the reinforcement belt also decreases as the tire's running speed increases as the internal temperature increases.As the decrease in modulus at high temperatures leads to the deterioration of tire performance at high temperatures, it is very important to maintain the modulus at high temperatures. It can be said to be a required characteristic of.

In general, widely used cords for passenger car tires include rayon, polyethylene terephthalate (PET) and nylon. The PET cord is disadvantageous in the heat-resistant adhesive force and the modulus decrease at high temperature is difficult to use as a reinforcing belt. In addition, there is no shrinkage-related behavior in the case of rayon, and it is difficult to use the cord because it does not hold the belt due to the length of the cord rather at a high temperature. Finally, the most widely used nylon currently uses nylon 66, which has better heat resistance than nylon 6, and nylon 66 has excellent heat adhesive resistance and lower modulus at high temperature than PET or nylon 6. It is a reinforcement belt material that is used the most in the world so far with the advantage of low. However, due to the nature of nylon, the basic modulus is very low, there is some limitation in terms of improved steering stability.

Until now, aramid cord, aramid hybrid cord, and polyethylene naphthalene cord (PEN Cord) are used for reinforcing belts, which have the advantages and disadvantages. This is applied only to luxury tires.

Carcass is the skeleton part of the tire, and the entire layer of tire cord paper is called carcass. Carcass serves to withstand the air pressure, load and impact inside the tire. Among them, the weft part (carcass forming the vertical direction of the carcass) that crosses the carcass serves to equalize the gap between the warp yarns during the manufacture of the cord and to prevent the twist between the warp yarns during processing. Nylon cores and Olboplasts made of short fibers in the covering are used, and the physical properties are very weak.

One object of the present invention for solving the above-mentioned problems of the prior art is to provide a tire carcass weft weaving cord that can be used in the weft of the carcass to improve the durability and adjustment stability of the tire.

Another object of the present invention is to provide a tire carcass including the tire weft and the tire to which the same is applied.

One aspect of the present invention for achieving the above object relates to a tire carcass weft cord using a high modulus and a low modulus hybrid cord and a tire carcass comprising the same.

In another aspect, the present invention relates to a pneumatic tire for a passenger car to which the tire carcass is applied.

Tire carcass according to the present invention and a pneumatic tire for a passenger car using the same have excellent modulus at room temperature and low temperature, thereby improving durability and steering stability at low and high speeds.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cutaway view of a tire carcass including a carcass weft according to the present invention and a pneumatic tire for a passenger car applying the same.

Referring to FIG. 1, the present invention provides a pneumatic tire including a rubberless layer 1, a reinforcing belt portion 2, belts 3 and 4, and a weft portion crossing the carcass portion 5. Weft-side cord is characterized in that the high modulus (High Modulus)-made of Low Modulus hybrid cord.

The weft thread is a cord constituting the vertical direction of the carcass portion (5).

The hybrid cord may have different modulus in a cord twisting process, but the high modulus cord of the hybrid cord is 20 g / Denier or more, and the low modulus cord is preferably 2 to 12 g / Denier.

If the high modulus cord is less than 20 g / Denier, there is a slight problem on the tire performance. If the low modulus cord is less than 2, the hybrid cord is too stiff and has a problem in fatigue resistance.

The high modulus code and the low modulus code in the hybrid code may have a quantitative fineness of 840 to 1260 denier, respectively, but is not limited thereto.

Although there is no particular limitation in the number of twists of the high modulus cord and the low modulus cord in the hybrid cord, it is preferable to have a twist number of 240 to 480 TPM.

The carcass cord may be manufactured using the carcass weft cord for the carcass weft.

The hybrid cord may have a carcass weft array of 2 to 10 end per inch (EPI), and 3 to 5 (EPI).

The high modulus code is at least one of rayon, PBO (poly (p-phenylene-2,6-benzobisoxazole)), aramid (Aramid), polyvinyl alcohol (PVA), or Carbon Fiber, low modulus code May be one or more of nylon 6, nylon 66, or nylon 46.

In another aspect, the present invention relates to a pneumatic tire for a passenger car comprising the tire carcass weft.

The car tire applied to the carcass weft part manufactured by the high modulus and the low modulus hybrid cord has a carcass part that can share the role of the reinforcing belt, so even if conventional nylon is used for the cap ply, the carcass weft part The hybrid cord improves low and high speed durability and maneuverability at the same time by improving modulus at room temperature and degrading modulus at high temperature while driving.

Method for manufacturing a tire comprising a carcass weft manufactured by a hybrid cord according to the present invention is as follows.

First, the high modulus and the low modulus chips are spun respectively, followed by twisting, weaving, and heat treatment under similar conditions as in the production of a conventional nylon cord to use as a carcass weft thread.

Then, a pneumatic radial tire to which the cord is applied is manufactured.

Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples. However, this is for the purpose of explanation and the present invention is not limited thereto.

Example  One

Aramid as a high modulus cord, nylon 66 as a low modulus cord is twisted to 1: 1 (D / 1) to make a hybrid cord (D / 2) Carcass weft cords were prepared by weaving and heat treatment under conditions similar to those of conventional nylon cord manufacture.

Comparative example  One

The carcass weft cord using Olboplast, which is currently commonly used, was used as Comparative Example 1.

Table 1 shows the results of the physical properties of the carcass weft cord of Example 1 and Comparative Example 1.

Example  2, Example  3 and Comparative example  2

The carcass weft part manufactured by Example 1 and Comparative Example 1 was configured as shown in Table 2 to manufacture a pneumatic tire for a passenger vehicle, and evaluated the high-speed running durability (ECER 30) and initial adjustment stability of the manufactured tire. , The evaluation of driving stability after high-speed driving was performed as follows, and the results are shown in Table 3 below.

(1) High speed driving durability evaluation (ECER 30)

  It evaluated based on ECER30 which is a high speed driving durability test method.

(2) Initial adjustment stability evaluation

The vehicle equipped with the tires required for the evaluation is adjusted by a professional experiment driver who can detect changes in adjustment stability, and grasp the degree of adjustment stability.

Here, initial adjustment stability measured the adjustment stability performance at the beginning of tire mounting.

(3) The evaluation of the driving stability after the high-speed driving is a measure of the adjustment stability in the state where the tire is preheated after 30 minutes of running the evaluation tire at 160 km / hr.

As shown in the results of Table 3, Examples 2 and 3 have excellent driving stability at high speed driving durability, low speed and high speed driving, while Comparative Example 2 has poor driving stability at high speed driving durability, low speed and high speed driving. Results are shown.

1 shows a cutaway view of a tire.

[Description of main part of drawing]

1: rubber layer, 2: reinforcing belt layer 3, 4: belt layer

4: belt layer 5: carcass layer

Claims (6)

Cord for tire carcass wefts manufactured from High Modulus and Low Modulus hybrid cords. The cord of claim 1, wherein the high modulus cord of the hybrid cord is 20 g / Denier or more and the low modulus cord is 2 to 12 g / Denier. The method of claim 1, wherein the high modulus code is one of rayon, PBO (poly (p-phenylene-2,6-benzobisoxazole)), aramid (Aramid), polyvinyl alcohol (PVA), or carbon fiber (Carbon Fiber) The cord for the tire carcass weft thread which is more than one and a low modulus cord is one or more of nylon 6, nylon 66, or nylon 46. A tire carcass comprising a cord for a tire carcass weft part according to any one of claims 1 to 3. 5. The tire carcass of claim 4, wherein the tire carcass has a weft arrangement of the weft thread cord of 2 to 10 end per inch (EPI). A pneumatic tire for a passenger car comprising the tire carcass according to claim 5.

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