KR101705630B1 - A Hybird Dipped cord and Radial tire Using the Same - Google Patents

Abstract

The present invention relates to a hybrid dipped cord made of poly (p-phenylene terephthalamide) yarn and polyketone yarn, and a radial tire including the hybrid dipped cord in a carcass layer or a belt reinforcing layer. A method of manufacturing a hybrid dip cord for a radial pneumatic tire according to the present invention is a method for manufacturing a hybrid dip cord for a radial pneumatic tire, comprising the steps of imparting a S-direction twist of 30 to 200 TPM to a polyketone yarn, , A single polyketone (Polyketon) linear yarn and a single poly (p-phenylene terephthalamide) yarn to which no twist is imparted is subjected to a Z-directional twist of 300 to 500 TPM, Preparing a raw cord by saddle-stitching two pilasters and applying an S-direction streak of 300 to 500 TPM staple to the raw cord, and immersing the raw cord in the dipping solution.

Description

Technical Field [0001] The present invention relates to a hybrid dipped cord manufacturing method and a radial tire using the hybrid dipped cord,

The present invention relates to a hybrid dipped cord made of poly (p-phenylene terephthalamide) yarn and polyketone yarn, and a radial tire including the hybrid dipped cord in a carcass layer or a belt reinforcing layer.

In recent years, the performance of tires has been continuously improved according to improvement of the road environment and the performance of the vehicle. Especially, as the weight of the vehicle increases and the speed of the vehicle increases, safety is regarded as an important factor for the tires. The safety standards of tires are also being changed in accordance with the increasing demand for safety of tires. Researches on methods for imparting safety of tires in the tire industry are also being actively conducted.

Conventional radial tires include a carcass ply reinforced with a fiber cord such as polyethylene terephthalate, rayon or aramid, and a belt structure reinforced with a steel cord. The bead wire is reinforced at the contact portion between the tire and the rim to prevent the tire from coming off the rim and to maintain stability, and this bead wire also serves to fix the carcass ply.

Recently, some of poly (p-phenylene terephthalamide) has been used for radial tires of ultra-high speed and low flatness ratio, but poly (p-phenylene terephthalamide) has excellent mechanical and thermal properties and shape stability compared with polyethylene terephthalate Excellent, but the price is too high, so its application is limited.

Background Art [0002] European Patent No. 4893665, a prior art related to hybrid codes, discloses a hybrid cord fabricated by spinning one wound each of nylon or polyethylene terephthalate wound yarns on poly (p-phenylene terephthalamide) fibers. Poly (p-phenylene terephthalamide) fibers have a significantly higher modulus than nylon or polyethylene terephthalate fibers. Due to the difference in physical properties, when one poly (p-phenylene terephthalamide) fiber and one wound yarn of nylon or polyethylene terephthalate are respectively wound, non-uniformity of tensile strength may occur in the raw cord. Due to such a problem, the strength utilization ratio at the time of twisting and dipping is rapidly deteriorated. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and has the following purpose.

It is an object of the present invention to provide a process for producing hybrid dip cords for air inlet radial tires produced by imparting appropriate twist to poly (p-phenylene terephthalamide) yarns and polyketone yarns.

It is another object of the present invention to provide an air inlet radial tire comprising a carcass ply and a cap ply (belt reinforcement layer) made of such a hybrid dipped cord.

In order to accomplish the above object, the present invention provides a method of manufacturing a hybrid dipped cord for a radial pneumatic tire, the method comprising the steps of: providing a single polyketone yarn with an S direction twist of 30 to 200 TPM ; Preparing a single polyketone linear yarn and a single poly (p-phenylene terephthalamide) yarn not provided with twist to give a Z direction twist of 300 to 500 TPM yarns respectively to produce a twisted yarn; Folding the lower twist yarn in two, and applying a S-direction uprising of 300 to 500 TPM soft yarns to produce a raw cord; And immersing the raw cord in a dipping liquid.

The present invention also relates to a method for producing a polyketone resin by imparting a twist to a polyketone yarn and a poly (p-phenylene terephthalamide) yarn of a single polyketone resin by 30 to 200 TPM lower than that of a poly (p-phenylene terephthalamide) Preparing a Z-direction underfilm of 300 to 500 TPM yarns; Folding the lower twist yarn in two, and applying a S-direction uprising of 300 to 500 TPM soft yarns to produce a raw cord; And immersing the raw cord in a dipping solution.

The present invention also provides a radial pneumatic tire including a pair of bead cores, a carcass ply, a belt layer laminated on the outer peripheral side of a carcass ply, and a belt reinforcing layer in the circumferential direction formed on the outer peripheral side of the belt layer, A radial pneumatic tire comprising a carcass layer or a belt reinforcing layer made of a hybrid dipped cord according to the present invention.

According to the present invention, a polyketone yarn having a relatively high elongation is controlled to have a low final twist number (twisted yarn after applying the bottom yarn) And the poly (p-phenylene terephthalamide) yarn are made equal to each other at the time of breaking, the strength of the cord can be improved.

According to the present invention, a hybrid dipped cord made of polyketone and poly (p-phenylene terephthalamide) of the present invention is applied to a carcass ply and a cap ply (belt reinforcing layer) of an air inlet radial tire for a passenger car, And steering stability.

1 shows a structure of a tire for a passenger car in which a hybrid dipped cord according to the present invention is applied as a carcass ply or a cap ply.

A method of producing a cord according to the present invention comprises the steps of providing a single polyketone yarn with a twist in the S direction of 30 to 200 TPM yarns to produce a warp yarn, a step of forming a single polyketone warp yarn, (P-phenylene terephthalamide) yarns of 300 to 500 TPM in the Z direction to form a twisted yarn, and the twisted yarns are folded in two to form an S-direction streak of 300 to 500 TPM yarns To prepare a raw cord, and a step of immersing the raw cord in a dipping liquid for processing. Further, the method of producing a cord according to the present invention is characterized in that, in the lowering step, one polyketone yarn and one poly (p-phenylene terephthalamide) yarn are mixed with poly (p- By 30 to 200 TPM lower in the Z direction to produce a warp yarn and doubling the warp yarn in two to prepare an S cord of 300 to 500 TPM yarn, have. The raw cord manufactured according to the manufacturing method of the present invention is immersed and treated in a dipping solution to become a hybrid dip cord. It is necessary to prepare a raw cord by applying a twist to the cord in a previous step for manufacturing the hybrid dipped cord according to the present invention (twisting process).

The present invention relates to a method of producing a warp knitting yarn by imparting a S-direction twist of 30 to 200 TPM yarn to a single polyketone yarn to produce warp yarns, or to a single polyketone yarn and poly (p-phenylene terephthalamide) The present invention is characterized in that a twist of the Z-direction is imparted by lowering the softening temperature of the polyketone to 30 to 200 TPM in comparison with the poly (p-phenylene terephthalamide) yarn to produce a twisted yarn and then the twisted yarn is subjected to a twisting process. This process is designed so that tensile stress acts primarily on the polyketone yarn during the initial stretching of the raw cord by controlling the final twist number (the number of twisted yarns after the lower yarn is applied) to the polyketone yarn having a relatively high elongation, And poly (p-phenylene terephthalamide) yarns at the same time so as to improve the strength utilization ratio of the raw cord. If the lead kettle is given less than 30 TPM to the polyketone or the lower end of the polyketone is less than 30 TPM compared to the poly (p-phenylene terephthalamide), the effect of the lead is insufficient, Phenylene terephthalamide) to cause excessive tensile stress. On the other hand, if polyketone is given more than 200 TPM of lead, or if the softening point of polyketone is more than 200 TPM relative to poly (p-phenylene terephthalamide), tensile stress is applied to polyketone There arises a problem that it is concentrated too much.

In the manufacturing method according to the present invention, the physical properties such as the strength of the cord, the tensile strength and the fatigue resistance of the cord are changed according to the degree of twisting (number of years) given to the poly (p-phenylene terephthalamide) yarn and the polyketone yarn . Generally, when the twist is high, the strength decreases, and the midline and the twist tend to increase. My fatigue also shows a tendency to improve with increasing kinks. The hybrid tire cord manufactured by the present invention can be manufactured at 300/300 TPM to 500/500 TPM at the same time as the upper and lower tires, and the same value is given to the upper and lower tires, So that it is easy to maintain a straight line image, thereby maximizing the physical property manifestation. If it is less than 300/300 TPM, the output of the live cord is reduced and the fatigue resistance is likely to decrease. On the other hand, if it exceeds 500/500 TPM, the strength drop is too large to be suitable for tire cords.

The produced raw cord is woven using a weaving machine, and the obtained fabric is dipped and cured in the dipping solution to produce a dip cord for a tire cord to which a resin layer is attached to the raw cord surface.

In the manufacturing process according to the present invention, dipping refers to impregnating a resin layer called RFL (Resorcinol Formaline Latex) on the surface of the fiber. The dipping process is carried out in order to improve the disadvantage of the tire cord fabric which has poor adhesion to rubber.

In the present invention, an adhesive liquid for bonding a hybrid cord and rubber can be manufactured by the following method.

Method of manufacturing adhesive liquid

29.4 wt% Resocinol 45.6 parts by weight; 255.5 parts by weight of distilled water; 37% formalin 20 parts by weight; And 3.8 parts by weight of 10 wt% sodium hydroxide was prepared and reacted at 25 DEG C for 5 hours with stirring, and the following components were added.

40 wt% VP-latex weight parts; 129 parts by weight of distilled water; And 23.8 parts by weight of 28% ammonia water.

After the ingredients are added, they are aged at 25 ° C for 20 hours to maintain the solid content concentration at 19.05%.

After the hybrid cord is dried, the adhesive liquid is applied. In order to control the adhesion amount of the adhesive liquid, the hybrid cord is stretched to 1 to 5%, preferably to an elongation of 2 to 4%. If the elongation percentage is too high, the adhesion amount of the adhesive liquid can be adjusted but the yield is reduced and the fatigue resistance is reduced as a result. On the other hand, if the elongation percentage is lowered too much, for example, if it is lowered to less than 1%, there is a problem that it is impossible to control the DPU (Defect Per Unit) by penetrating the dipping liquid into the polyketone yarn cord.

The adhesion amount of the adhesive is preferably 4 to 6% based on the weight of the fibers based on the solid content. After passing through the adhesive solution, the hybrid dip cords are dried at 120-150 ° C. Drying is performed for 180 seconds to 220 seconds, and the hybrid dipped cord may be streched by about 1 to 2% during the drying process. If the elongation ratio is low, the cords and the cord of the cord increase, which may result in a property that is difficult to apply to the tire cord. On the other hand, if the elongation ratio is more than 2%, the level of the medium is adequate but the turnover is too small and fatigue can be reduced.

After drying, heat treatment is performed at a temperature range of 130 to 170 캜. The stretching ratio in the heat treatment may be from -1 to 0%, and the heat treatment time is suitably from 50 to 90 seconds. If the heat treatment is performed for less than 50 seconds, the reaction time of the adhesive solution is insufficient and the adhesive force is lowered. If the heat treatment is performed for 90 seconds or more, the hardness of the adhesive solution may increase and the fatigue resistance of the cord may be decreased .

The hybrid dipped cord produced through such a process is applied as a carcass ply and a cap ply and is used for manufacturing tires for passenger cars.

1 shows a structure of a tire for a passenger car in which a hybrid dipped cord according to the present invention is applied as a carcass ply or a cap ply.

1, the bead region 35 of the tire 31 becomes an annular bead core 36 which is non-stretchable. The bead core 36 is preferably made of a single filament wire wound continuously. Preferably, a high strength steel wire having a diameter of 0.95 mm to 1.00 mm may be formed in a 4x4 structure or a 4x5 structure.

In an embodiment of the tire cord according to the present invention, the bead region 35 may have a bead filler 37, the bead filler 37 should have a hardness above a certain level, preferably a Shore A hardness Shore A hardness) Hardness of 40 or more.

According to the invention, the crown portion can be reinforced by the belt structure 38 and the cap ply 39. The belt structure 38 includes a cut belt ply 40 comprised of two belt cords 41 and 42 and the belt cords 41 of the belt ply 40 comprise about 20 Lt; / RTI > One belt cord 41 of the belt ply 40 may be disposed opposite the direction of the belt cord 42 of the other belt ply 40 in a direction opposite the circumferential center plane. However, the belt structure 38 may comprise any number of plys, and may preferably be arranged in the range of 16 to 24 psi. The belt structure 38 serves to provide lateral stiffness to minimize the rise of the tread 33 from the road surface during operation of the tire 31. [ The belt cords 41, 42 of the belt structure 38 can be made of steel cords and have a 2 + 2 structure, but can be made of any structure. The cap ply 39 and the edge ply 44 are reinforced on the upper portion of the belt structure 38 so that the cap ply cords 45 of the cap ply 39 are reinforced in parallel with the circumferential direction of the tire, The cap ply cords 45 of the cap ply 39 having a large heat shrinking stress at a high temperature are used. The cap ply cords 45 of the cap ply 39 may be prepared using hybrid dip cords made of polyketone yarns and poly (p-phenylene terephthalamide) yarns made according to the method of the present invention. One layer of cap ply 39 and one layer of edge ply 44 may be used, and preferably one or two layers of cap ply and one or two layers of edge ply may be reinforced.

Reference numerals 32 and 34, which are not illustrated in FIG. 1, represent the carcass layer 32 and the fly turn 34. And reference numeral 33 denotes a carcass layer reinforcing cord 33. [

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to examples. The characteristics of the hybrid dip cords in Examples and Comparative Examples were evaluated in the following manner.

How to measure property

(a) Hybrid dip cord strength (kgf) and moderate elongation (%)

Dried at 107 DEG C for 2 hours, and then measured using a low-speed elongation tensile tester manufactured by INSTRONG Co. under the conditions of a sample length of 250 mm and a tensile rate of 300 m / min. The elongation was measured at a load of 6.8 kg.

(b) Dry Heat Shrinkage (%, Shrinkage)

On the 25 ℃, 65% RH for 24 hours, allowed to stand, of a length measured in a 0.05g / d static load (L ₀₎ and a 150 ℃ after treatment in static load for 30 minutes. 0.05g / d length (L ₁₎ The ratio of dry heat shrinkage is expressed by the following formula.

S (%) = [(L ₀ - L ₁ ) / L ₀ ] × 100

(c) Shrinkage force (N)

The test piece was allowed to stand at 25 ° C and 65% RH for 24 hours and treated at 177 ° C for 2 minutes under a static load (F ') of 0.05 g / d using a Testrite machine. And so on.

S (N) = F '- F

(d) hybrid dip code ES value

The term "elongation under a constant load" is referred to as "elongation (E)" in the present invention. "S" means the dry heat shrinkage rate in the above (b), and the sum of the elongation at break (E) Respectively.

ES = elongation at break (%) + dry heat shrinkage (%)

(e) My fatigue

The fatigue strength was measured by using a belt fatigue tester (fatigue tester) commonly used for tire cord fatigue test, and the fatigue resistance was compared. The fatigue test conditions were 40 ℃, 70kg load and 34.58% compression. After the fatigue test, the rubber was swelled by immersing in tetrachlorethylene solution for 24 hours, and then the rubber and cord were separated and the residual strength was measured. The residual strength was measured by the method (a) described above using a conventional tensile strength tester after drying at 107 DEG C for 2 hours.

[Example]

Example 1

Poly (p-phenylene terephthalamide) yarn and polyketone fibers were respectively obtained according to the above-described method for producing tire reinforcing fibers. One polyketone yarn (1500D) and one poly (p-phenylene terephthalamide) not imparted with a twist were attached to one polyketone yarn (1500D) (1000) were each twisted at 450 TPM to prepare a twisted yarn. The twisted twisted yarn was doubled to produce a twisted yarn at 450 TPM. The obtained hybrid cord was dried at 100 DEG C for 130 seconds, and then passed through an adhesive liquid prepared by the following method to give an adhesive liquid. A 2% stretch was applied during drying to prevent unevenness of raw cord due to heat shrinkage.

29.4 wt% resorcinol 45.6 parts by weight; 255.5 parts by weight of distilled water; 37% formalin 20 parts by weight; And 3.8 parts by weight of 10 wt% sodium hydroxide were prepared and reacted with stirring at 25 DEG C for 5 hours, and 300 parts by weight of 40 wt% VP-latex; 129 parts by weight of distilled water; 23.8 parts by weight of 28% ammonia water were added. After the components were added, the mixture was aged at 25 DEG C for 20 hours to maintain the solid concentration at 19.05%.

After the adhesive liquid was applied and dried at 150 ° C for 2 minutes, heat treatment was performed at 170 ° C for 1 minute to finish the adhesive treatment. The physical properties of the thus-prepared hybrid dip cords were evaluated and are shown in Table 1.

Example 2

Experiments were carried out in the same manner as in Example 1 except that the polyketone was led to 80 TPM to prepare raw cord and treated cord. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Example 3

A twist of 390 TPM and 450 TPM was applied to one polyketone yarn and one poly (p-phenylene terephthalamide) yarn to prepare a twisted yarn, and the twisted twist yarns were piled up to 450 TPM The treated cord was fabricated by performing an experiment in the same manner as in Example 1, except that the raw cord was prepared by applying the top coat. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Example 4

A twist of 330 TPM and 450 TPM was applied to one polyketone yarn and one poly (p-phenylene terephthalamide) yarn to prepare a twisted yarn, To prepare a raw cord, and the experiment was conducted in the same manner as in Example 1 to prepare a treated cord. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

[Comparative Example]

Comparative Example 1

Experiments were carried out in the same manner as in Example 1 except that polyketone fibers were preliminarily treated with 0 TPM to prepare raw cord and treated cord. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Comparative Example 2

Experiments were carried out in the same manner as in Example 1 except that the polyketone fibers were preliminarily treated with 10 TPM to prepare raw cord and treated cord. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Comparative Example 3

Experiments were carried out in the same manner as in Example 1 except that the polyketone fibers were preliminarily stretched at 210 TPM to prepare raw cord and treated cord. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Comparative Example 4

A twist of 440 TPM and 450 TPM was applied to one polyketone yarn and one poly (p-phenylene terephthalamide) yarn to produce a twisted yarn, and the twisted twist yarn was doubled to 450 TPM The treated cord was fabricated by performing an experiment in the same manner as in Example 1, except that the raw cord was prepared by applying the top coat. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

Comparative Example 5

A twist of 240 TPM and 450 TPM was applied to one polyketone yarn and one poly (p-phenylene terephthalamide) yarn to prepare a twisted yarn, and the twisted twist yarns were piled up to 450 TPM The treated cord was fabricated by performing an experiment in the same manner as in Example 1, except that the raw cord was prepared by applying the top coat. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

division
Processing Code Properties Remarks
Strength (g / d) Intermediate stretch
6.8kg (%) Shrinkage (%) ES value (%) Shrinkage (N) My fatigue (%) Example 1 13.0 2.1 10. 3.1 4.1 82.3 Strength excellent,
Excellent fatigue Example 2 13.8 2.3 1.2 3.5 4.4 85.1 Strength excellent,
Excellent fatigue Example 3 13.1 2.2 1.1 3.3 4.2 83.1 Strength excellent,
Excellent fatigue Example 4 13.5 2.4 1.2 3.6 4.4 84.5 Strength excellent,
Excellent fatigue Comparative Example 1 11.0 2.0 1.0 3.0 4.0 69.2 Low intensity,
My fatigue is very low Comparative Example 2 11.7 2.0 1.0 3.0 4.1 70.3 Low intensity,
My fatigue is low Comparative Example 3 10.7 2.1 1.1 3.2 4.2 73.7 Low intensity,
My fatigue is low Comparative Example 4 12.1 2.2 1.2 3.4 3.5 71.5 Low contractility,
My fatigue is low Comparative Example 5 10.8 2.3 1.2 3.5 3.9 76.1 Low intensity,
My fatigue is low

In the case of the hybrid dipped cord according to the present invention (Examples 1, 2, 3 and 4), the hybrid dipped cord (Comparative Example 1) using a polyketone yarn to which no lead wire was added The strength, shrinkage force and fatigue resistance are significantly improved.

Further, hybrid dipped cords (Comparative Examples 4 and 5) using hybrid dip cords (Comparative Examples 2 and 3) using polyketone yarns imparted with lead 10 TPM and 210 TPM and polyketone yarns imparted with 440 TPM and 240 TPM And the fatigue resistance is low.

Example 5

A radial tire manufactured using the hybrid dipped cord manufactured by Example 1 of the present invention as a cap ply has a carcass layer having a radially outer side fly-turn, and the carcass layer is provided so as to include one layer. At this time, the specifications of the carcass cord were as shown in the following Table 2 and aligned at an angle of 9 degrees with respect to the circumferential middle surface of the tire. The fly-turn 34 has a height of 40% to 80% with respect to the maximum cross-sectional height of the tire. The bead region 35 has a bead core 36 having a 4 x 4 high strength steel wire having a diameter of 0.95 mm to 1.00 mm and a bead filler 37 having a hardness of 40 or more shore A hardness. The belt structure 38 is reinforced by a belt reinforcing layer consisting of one layer of cap ply 39 and one layer of edge ply 44 at the top and the cap ply cords 45 in the cap ply 39 extend in the circumferential direction of the tire As shown in Fig.

Example 6

A tire was prepared in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 2. [

Example 7

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 3.

Example 8

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 4.

Comparative Example 6

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was a dip cord manufactured by Comparative Example 1.

Example 5 Example 6 Example 7 Example 8 Comparative Example 6 Kakas Material Polyethylene
Terephthalate
It Polyethylene
Terephthalate
It Polyethylene
Terephthalate
It Polyethylene
Terephthalate
It Polyethylene
Terephthalate
It Specification (d / joint) 1000d / 2 1000d / 2 1000d / 2 1000d / 2 1000d / 2 Strong (Kg) 14 14 14 14 14 Modulus of elasticity (g / d) 60 60 60 60 60 Cap fly Material Example 1
Hybrid
Deep code Example 2
Hybrid
Deep code Example 3
Hybrid
Deep code Example 4
Hybrid
Deep code Comparative Example 1
Hybrid
Deep code tire Flat rate 0.60 0.60 0.60 0.60 0.60 Number of carcass layers One One One One One Cap fly layer number One One One One One

Example 9

A radial tire manufactured using the hybrid dip code manufactured by Example 1 of the present invention has a carcass layer having a radially outer side fly-turn, and the carcass layer is provided so as to include one layer. At this time, specifications of the cap fly and carcass cord were as shown in the following Table 3, and tires were produced in the same manner as in Example 5.

Example 10

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 2.

Example  11

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 3.

Example 12

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was the hybrid dipped cord prepared in Example 4.

Comparative Example 7

A tire was produced in the same manner as in Example 5, except that the cord material for tire fabrication was a dip cord manufactured by Comparative Example 1.

Example 9 Example 10 Example 11 Example 12 Comparative Example 7 Kakas Material Example 1
hybrid
Deep code Example 2
hybrid
Deep code Example 3
hybrid
Deep code Example 4
hybrid
Deep code Comparative Example 1
hybrid
Deep code Cap fly Material Nylon 66 Nylon 66 Nylon 66 Nylon 66 Nylon 66 Specification (d / summing speaker) 840D / 2p 840D / 2P 840D / 2P 840D / 2P 840D / 2P Strong (Kg) 15.0 15.0 15.0 15.0 15.0 tire Flat rate 0.60 0.60 0.60 0.60 0.60 Number of carcass layers 2 2 2 2 2 Cap fly layer number One One One One One

The 225/40 R17 Y tire manufactured according to Examples 5, 6, 7, 8, 9, 10, 11 and 12 and Comparative Examples 6 and 7 was mounted on a car of 2500cc class, (DB) in the audible frequency range by measuring the noise generated in the vehicle. The steered driver rides the test course and evaluates the driving stability and riding comfort in five points on the scale of 100 points. The results are shown in Table 4 below. The durability was measured according to the P-metric tire endurance test method of FMVSS 109 at a measurement temperature of 38 ° C (± 3 ° C), 85%, 90%, and 100% 80 km / h for a total of 34 hours, and it was judged to be acceptable when no traces of bead separation, cord cutting, belt separation, etc. were found in any part such as tread, sidewall, carcass cord, inner liner and bead.

division Example 5 Example 6 Example 7 Example 8 Comparative Example 6 Tire Weight (kg) 9.54 9.70 9.55 9.69 9.60 Ride comfort 100 100 100 100 96 Steering stability 100 100 100 100 95 durability OK OK OK OK OK Uniformity 100 100 100 100 95 Noise (dB) 61.2 61.4 61.4 61.3 64.2

division Example 9 Example 10 Example 11 Example 12 Comparative Example 7 Tire Weight (kg) 9.64 9.70 9.63 9.71 9.60 Ride comfort 100 100 100 100 94 Steering stability 100 100 100 100 93 durability OK OK OK OK OK Uniformity 100 100 100 100 94 Noise (dB) 60.4 61.0 60.3 61.1 65.3

As a result of the test of Table 4, the tires (Examples 5, 6, 7, and 8) using the hybrid cord according to the present invention were prepared in the same manner as the Comparative Example using the cord that hybridized with polytetrafluoroethylene 6, the effect on noise reduction and steering stability was excellent, and the unity of the tire was also improved. In addition, from the results of the tests in Table 5, it can be seen that the tires (Examples 9, 10, 11, and 12) using the hybrid cord according to the present invention were compared with polyketone yarns The noise reduction and steering stability were superior to Example 7, and the tire uniformity was also improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. To those of ordinary skill in the art.

31: Tire 32: Carcass layer
33: Carcass layer reinforcement cord 34: Fly turn-up
35: bead region 36: bead core
37: bead filler 38: belt structure
39: cap fly 40: belt fly
41, 42: belt cord 43: tread
44: edge fly 45: cap fly cord

Claims (3)

A method of manufacturing a hybrid dipped cord for a radial pneumatic tire,
Preparing a linear polytetrafluoroethylene yarn by applying an S-directional twist of 30 to 200 TPM yarns to one polyketone yarn;
Preparing a single polyketone linear yarn and a single poly (p-phenylene terephthalamide) yarn not provided with twist to give a Z direction twist of 300 to 500 TPM yarns respectively to produce a twisted yarn;
Folding the lower twist yarn in two, and applying a S-direction uprising of 300 to 500 TPM soft yarns to produce a raw cord; And
Immersing the raw cord in a dipping liquid to prepare a hybrid dip cord,
Wherein the hybrid dipped cord has a strength of 13.0 to 13.8 g / d, an ES value (modulus of elongation + dry heat shrinkage) of 3.1 to 3.5%, and an internal fatigue of 82.3 to 85.1%. A method of manufacturing a hybrid dipped cord for a radial pneumatic tire,
The polyketone yarn is twisted by 30 to 200 TPM lower than that of poly (p-phenylene terephthalamide) yarn to one polyketone yarn and one poly (p-phenylene terephthalamide) yarn, Fabricating a Z-direction underside of the TPM yarn;
Folding the lower twist yarn in two, and applying a S-direction uprising of 300 to 500 TPM soft yarns to produce a raw cord; And
Immersing the raw cord in a dipping liquid to prepare a hybrid dip cord,
Wherein the hybrid dipped cord has a strength of 13.1 to 13.5 g / d, an ES value (modulus of elongation + dry heat shrinkage) of 3.3 to 3.6%, and an internal fatigue of 83.1 to 84.5%. A radial pneumatic tire comprising a pair of bead cores, a carcass ply, a belt layer laminated on the outer circumferential side of a carcass ply, and a belt reinforcing layer in a circumferential direction formed on an outer circumferential side of a belt layer, A carcass layer or a belt reinforcing layer made of a deep cord, and the noise is 60.3 to 61.4 dB.

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