KR101928865B1 - Eco-friendly addititives containing lyocell dipped cord improved fatigue properties - Google Patents

Abstract

The present invention provides an industrial lyocell filament obtained by dissolving cellulose by using a NMMO hydrate as a solvent and adding an additive of soybean oil to the NMMO hydrate and appropriately adjusting the spinning, washing, emulsifying and drying conditions of the solution And to provide a lyocell heat treatment cord having improved fatigue resistance particularly suitable for a tire cord by performing a twist and heat treatment using the same.
According to a preferred embodiment of the present invention, there is provided a radial pneumatic tire using the lyocell heat-treated cord in a carcass layer or a cap ply layer in a one-layer or two-layer structure.

Description

[0001] The present invention relates to a lyocell heat-treatment cord containing an eco-friendly additive,

The present invention relates to a lyocell heat-treated cord prepared by immersing a lyocell raw cord made of at least two lyocell multifilaments in a dipping liquid and curing the lyocell heat-treated cord, wherein the additive of soybean oil is added during the preparation of cellulose dope And more particularly, to a method of providing a lyocell heat treatment code with improved fatigue resistance. The heat-treated cord according to the present invention may preferably be a heat treated cord for a lyocell for a tire cord, dissolving the cellulose in N-methylmorpholine N-oxide (hereinafter NMMO) / water, . ≪ / RTI >

Generally, a large amount of tire cord is used as a skeleton inside a tire. This is considered to be an important factor in tire shape maintenance and ride comfort. There are many types of cord materials currently used, such as polyester, nylon, aramid, rayon and steel. It does not fully satisfy the various functions required by the code. (3) fatigue resistance; (4) dimensional stability; (5) mechanical properties of rubber and rubber; and (5) , And the like. Therefore, it has been used according to the specific properties of each cord material.

Among these, the greatest merit of rayon tire cord is heat resistance and shape stability, and the elastic modulus is maintained even at high temperature. Therefore, such low shrinkage ratio and excellent shape stability have been mainly used for radial tires for high-speed driving of passenger cars and the like. However, rayon tire cords have drawbacks of weak strength due to moisture absorption due to chemical and physical structure which is low in strength and modulus and easy to absorb moisture.

On the other hand, the lyocell fiber, which is a man-made fiber made of cellulose, has low elongation and heat shrinkage as compared with rayon fiber, has high strength and modulus and is not only excellent in form stability, but also has low moisture content, It has high characteristics. Therefore, it can be considered as an alternative to the above requirement because it has a relatively small morphological change as compared with rayon (60%). However, low fatigue due to radioactive and low elongation and high crystallization for tire cord .

Cellulose has a very high affinity with other materials, but it is difficult to dissolve in a general solvent due to a crystal structure formed by a strong hydrogen bond in a molecular chain or a chain. NMMO is widely used as a solvent capable of producing a solution by destroying this structure .

The production method of the lyocell fiber by NMMO is a pollution-free process due to the total recovery and reuse of the solvent and the advantage that the produced fiber and film have high mechanical strength, and thus it is widely used in the manufacturing process of the product made of cellulose do.

In order to solve the problems of low strength and low initial modulus of conventional viscose rayon tire cords, NMMO hydrate is dissolved directly in a solvent using a solvent, and the spinning, washing, emulsion treatment and drying conditions of the solution are appropriately The present invention provides a lyocell heat-treated cord suitable for use in a tire cord by obtaining an industrial lyocell filament and controlling the twist yarn and heat treatment by using the same.

Particularly, in the conventional lyocell tire cord, the shape change is less than that of rayon, and the degree of fatigue is low due to low elongation. However, in order to solve the problem, the lyocell fiber is added to the soybean oil To provide the lyocell fiber improved in fatigue resistance.

According to an embodiment of the present invention, there is provided a lyocell heat-treated cord produced by immersing a lyocell raw cord made of at least two lyocell multifilaments in a dipping liquid, wherein the lyocell multifilament has a cross-sectional porosity of 1 to 30 %, The additive of soybean oil is 5% or less, and the fatigue resistance of the heat-treated cord is 10% or more.

According to another embodiment of the present invention, the additive for the soybean oil includes at least 3 and at most 15 epoxy groups in the molecular structure, and at least three alkyl group chains having at least 10 carbon atoms The branch structure.

According to another embodiment of the present invention, there is provided a belt structure comprising a pair of parallel bead cores, at least one radial carcass layer wound around the bead cores, a belt layer laminated on the outer circumferential side of the carcass layer, Wherein the carcass layer comprises a lyocell heat treated cord according to any one of claims 1 to 2 and wherein the carcass layer comprises one or two layers Is used as the radial pneumatic tire.

According to another embodiment of the present invention, there is provided a belt structure comprising a pair of parallel bead cores, at least one radial carcass layer wound around the bead cores, a belt layer laminated on the outer circumferential side of the carcass layer, Wherein the cap ply, which is the belt reinforcing layer, comprises a lyocell heat treated cord according to any one of claims 1 to 2, wherein the cap ply comprises one or two layers Layer radial pneumatic tire is provided.

According to a preferred embodiment of the present invention, the NMMO hydrate is dissolved in an organic solvent by dissolving cellulose using a solvent and adding an additive of soybean oil and then appropriately adjusting the spinning, washing, A lyocell heat treatment cord is provided which has improved fatigue resistance particularly suitable for tire cords by obtaining lyocell filaments and performing twisting and heat treatment using the lyocell filaments.

According to a preferred embodiment of the present invention, there is also provided a belt comprising: a pair of parallel bead cores; at least one radial carcass layer wound around the bead cores; a belt layer laminated on the outer circumferential side of the carcass layer; Radial pneumatic tires comprising a belt reinforcing layer in the direction of the carcass layer or the cap ply layer, wherein the lyocell heat treatment cord is applied to the carcass layer or the cap ply layer in a one- or two-layer structure.

FIG. 1 schematically shows a manufacturing process of a lyocell heat-treated cord according to the present invention.
2 is a partial cross-sectional view of the structure of a tire manufactured using the lyocell cord according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. The present invention is not limited to the scope of the present invention, but is merely an example, and various modifications can be made without departing from the technical gist of the present invention.

In order to produce homogeneous lyocell fibers in which degradation of cellulose is minimized and unhulled cellulose particles are not present, it is necessary to uniformly mix the cellulose powder with the liquid phase of NMMO at a low temperature within a short time to sufficiently penetrate the NMMO into the cellulose powder A swelling process is indispensable.

In order to accomplish the above object, the present invention provides a method for producing a highly homogeneous cellulose solution for a lyocell, which uses a cellulose molecule having a high degree of polymerization to induce a high orientation structure and a high crystallinity, thereby achieving high strength and elasticity. In order to produce high-quality cellulose fibers, it is preferable to use cellulose having a high? -Cellulose content. The prepared cellulose sheet is passed through a dryer and then pulverized to obtain powdered cellulose containing 1 to 10 wt% or less, more preferably 1 to 5 wt% or less of water, and concentrated liquid NMMO in an amount of 50 to 100 At a rotating speed of 100 to 250 rpm, and swelling and dissolving the cellulose solution to prepare a cellulose solution for a lyocell.

If the moisture content is less than 1 wt%, the economical efficiency is deteriorated. If the moisture content is more than 10 wt%, the mechanical properties are deteriorated.

The cellulosic solution may comprise an additive of soybean oil. The additive of soybean oil plays a role in increasing fatigue resistance.

The present invention also provides a lyocell heat treatment cord produced by immersing a lyocell raw cord made of at least two lyocell multifilaments in a dipping liquid and curing the lyocell multifilament, wherein the lyocell multifilament comprises: (a) Preparing a solution of N-methylmorpholine N-oxide (NMMO); (b) drying and pulverizing the cellulose sheet to prepare a cellulose powder maintained at a constant water content; (c) measuring the additives of the liquid NMMO solution, cellulose powder and soybean oil, respectively, and injecting the mixture into a biaxial extruder, swelling and dissolving the cellulose to prepare a cellulose solution; (d) spinning the cellulose solution to prepare a cellulose filament.

More specifically, the highly homogeneous cellulose solution according to the present invention comprises

(a) concentrating 25% by weight of NMMO hydrate collected from wash liquor with 86.5% by weight of liquid NMMO (monohydrate) by means of a thin film drawdown condenser;

(b) After passing through a dryer while passing through a cellulose sheet on a roll, the cellulose sheet is treated to adjust the drying temperature so that the cellulose sheet has a moisture content of 7%. The cellulose sheet is immediately cooled with dry air and injected into a pulverizer. Preparing powdered cellulose;

(c) feeding the liquid NMMO and the cellulose powder prepared in (a) and (b) above to a twin-screw extruder adjusted to a temperature ranging from 50 to 100 ° C by adding an additive of soybean oil and dissolving Lt; / RTI > In particular, the twin-screw extruder prepared at this time minimizes the decomposition of the cellulose by arranging the screw to have a narrow residence time distribution.

Hereinafter, a highly homogeneous cellulose solution for a lyocell according to the present invention and a method for producing the fiber will be described in more detail.

When the cellulose pulp sheet is pulled by the nip roller and fed to the pulverizer, the pulp sheet is then passed through a drying chamber adjusted to a constant temperature and then cooled with dry air to maintain it at 25 ° C. The drying temperature of the drying chamber is controlled so that the water content does not exceed 7% by using a contact type moisture meter before passing through the nip roller. Generally, the pulp supplied has a moisture content of about 8 to 10%, but exhibits a variation in the moisture content of the powdered cellulose stored in the storage tank after crushing according to seasonal humidity and temperature changes. If the water content is high, it is likely that the pulp is agglomerated and it is difficult to obtain a homogeneous solution. Also, since the compositional deviation of the NMMO / cellulose / water is shown, the thickness of the fiber radiated through the nozzle is also varied, and the uniform quality can not be obtained. The length of the powdered cellulose can be adjusted according to the size of the screen sieve mounted inside the mill equipped with the knife. It is preferable to use a powder having a size of 500 탆 or less, preferably 300 탆 or less. When the thickness is 500 μm or more, the pulp agglomeration tends to occur when mixed with NMMO, which is an inhibiting factor for producing a homogeneous solution. The powdered cellulose having passed through the screen of the pulverizer is supplied to the bag filter through the air blower to discharge the air to the outside and the powdered cellulose is supplied to the powdered cellulose reservoir through the rotary valve. This powdered cellulose is fed into the extruder through a precision weighing device.

A 25 wt% NMMO aqueous solution is prepared from a regeneration bath recovered from a coagulation bath and a water bath, the regeneration bath and the coagulation bath are continuously exchanged and maintained in concentration by pure water and 50 wt% NMMO. The 25 wt% NMMO aqueous solution thus prepared is supplied to a purification column using an ion exchange resin to remove ionic substances and carbonized impurities and stored in a feed tank of the concentrating column. And then again supplied from the concentrating tower feed tank to three thin film descending type concentrating tower in a sequential manner to prepare a final 86.5 wt% NMMO aqueous solution. NMMO concentrated to 86.5% by weight is fed into a jacketed reservoir maintained at 90 ° C and fed into the extruder through a gear pump.

The additive of soybean oil is a structure having at least 3 and at most 15 epoxy groups in the molecular structure and having at least three alkyl groups having at least 10 carbon atoms, Lt; RTI ID = 0.0 > 5% < / RTI > An additive comprising an alkyl group having less than 3, more than 15, or less than 10 carbon atoms in the epoxy group or containing less than 3 alkyl chain is undesirable because it lowers the strength of the cellulose fiber, Are also undesirable because they degrade the strength of the cellulose fibers. The internal temperature of the twin-screw extruder is adjusted from 50 ° C to 100 ° C to dissolve after complete swelling by temperature rise and shear force. The dissolved cellulose solution passes through the filter, and the solution discharged through the nozzle is washed, washed and then formed into cellulose fibers.

The cellulosic fibers produced according to the present invention are characterized in that the cross-sectional porosity of the yarn is 0.5 to 50%, more preferably 1 to 30%. As the porosity increases, the turnover increases and fatigue increases. When the porosity is less than 1%, the fatigue is decreased and it is not appropriate. When the porosity is more than 30%, the strength of the fiber is decreased, which is not suitable.

The manufacturing process of the lyocell filament is as follows. The solution extruded from the spinneret passes through an air gap in the vertical direction and solidifies in the coagulating bath. The air gap is preferably 10 to 300 mm in length to obtain dense and uniform fibers and to provide a smooth cooling effect.

The filament passing through the coagulation bath passes through the water bath. The temperature of the coagulation bath and water bath is preferably about 10 to 25 DEG C in order to prevent deterioration of physical properties due to abrupt desolvation.

The fibers that have passed through the water bath pass through a squeeze roller to remove moisture and then pass through a primary tanning apparatus.

Thereafter, the filament yarn that has passed through the primary tanning apparatus is dried while passing through the drying apparatus. The drying temperature, the drying method, and the drying tension greatly affect the post-processing and physical properties of the filament. In the present invention, the drying temperature is controlled so that the process water content becomes 7 to 13%.

The filaments passing through the drying device are finally wound in a winder through a secondary emulsion treatment device.

The fineness of the lyocell filaments wound around the winding machine is not particularly limited, but the single filament fineness is preferably 0.01 to 10 denier. In order to maintain the high strength properties of the lyocell filaments, the single fiber fineness is preferably 0.5 to 10 denier, more preferably 0.7 to 3 denier, and most preferably 0.7 to 2 denier. Although the total fineness is not particularly limited, it is preferably 5 to 30,000 denier in general, and 100 to 5000 denier in industrial materials.

The lyocell heat-treated cord of the present invention is subjected to a step of producing a raw cord by giving a twist to the cord as a previous stage of cord manufacturing (twisting process).

The twist yarns are manufactured by applying ply twist to a lyocell yarn followed by joining by applying a cable twist. Generally, the upper and lower yarns are subjected to the same softening (level of twist) or different softening water if necessary.

In the present invention, the soft water of the lyocell dipped cord has a value of 200/200 TPM (Twist Per Meter) or 600 to 600 TPM at the same value of the upper and lower sides. When the upper and lower edges are made to have the same numerical value, the manufactured dipped cords do not show any rotation or twist, and are easily maintained in a straight line, thereby maximizing physical property development. In this case, when the number of years of the upper / lower ends is less than 200/200 TPM, the yield of the cord is reduced and the fatigue resistance tends to decrease. When the temperature is more than 600 to 600 TPM, the strength is lowered.

The raw cord is composed of at least two lyocell multifilaments. If they are two, they will perform the stage while adding the bottom line, and if there are three, they can place a straight line on the bottom line and put on the bottom line. If it exceeds 3, the strength drop is large and it is not suitable for tire cord.

The produced 'Raw Cord' is woven into the fabric using a weaving machine and the fabric soaked in the dipping solution. Thereafter, the fabric is cured to produce a 'dip cord' for tire cords with a resin layer on the surface of the cord.

The raw cord, which is woven with the fabric and heat-treated, is immersed in the dipping solution, and then the fabric is cured to produce a dip cord for a tire cord having a resin layer on the surface of the raw cord.

Dipping in the above process means impregnating a resin layer called RFL (Resorcinol Formaline Latex) on the surface of the fiber. This is carried out in order to improve the disadvantage of the tire cord fabric which is originally poor in adhesion to rubber.

In the present invention, an adhesive liquid for bonding a cord to a rubber can be produced by the following method.

Method of manufacturing adhesive liquid

29.4 wt% resorcinol 45.6 parts by weight;

255.5 parts by weight of distilled water;

37% formalin 20 parts by weight; And

10 wt% sodium hydroxide 3.8 parts by weight

Is prepared and reacted with stirring at 25 ° C for 5 hours, and the following components are added.

40 wt% VP-latex 300 parts by weight

Distilled water 129 parts by weight

28% ammonia water 23.8 parts by weight.

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

After drying the cord, the adhesive liquid is applied. A stretch of 0 to 4% is required to adjust the adhesion amount of the adhesive liquid, and preferably 1 to 2% of the elongation can be achieved. 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.

The adhesion amount of the adhesive is preferably 1.5 to 3.5% based on the weight of the fibers on a solid basis. After passing through the adhesive solution, the dip cord is dried at 120-170 ° C. The drying time can be from 180 seconds to 220 seconds, and the dipping cord can be streched by 1 to 2% during the drying process. If the elongation ratio is low, the tensile strength and elongation of the cord may increase, which may result in a property that is difficult to apply to a tire cord. On the other hand, if the elongation ratio is more than 3%, the level of the medium is adequate but the turnover may be too small to reduce the fatigue resistance.

After drying, heat treatment is performed at a temperature range of 130 to 240 캜. The elongation ratio during the heat treatment is maintained between -2 and 2.0%, 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 more than 90 seconds, the hardness of the adhesive solution becomes high and the fatigue resistance of the cord may be decreased have.

The lyocell dipped cord prepared according to the method described above can be advantageously used as a tire cord for a passenger car. The dip code can be used for the fabrication of the cap ply layer. And the high performance radial tire manufactured according to the present invention includes such a cap ply layer.

2 is a partial cross-sectional view of the structure of a tire for a passenger car manufactured using a lysole dipped cord according to the present invention as a cap ply.

2, the bead region 35 of the tire 31 becomes an annular bead core 36 that is non-stretchable. The bead core 36 is preferably made of a single filament wire wound continuously. In a preferred embodiment, the high strength steel wire having a diameter of 0.95 mm to 1.00 mm has 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 0.0 > angle. ≪ / 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 include any number of plys, and may preferably be located in the range of 16 to 24 degrees. 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 can be made using a deep cord made of high strength yarn 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 described in FIG. 2, denote the carcass layer 32 and the fly-turn 34. And reference numeral 33 denotes a carcass layer reinforcing cord 33. [

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the following Examples.

In the following Examples and Comparative Examples, physical properties were evaluated or evaluated as follows.

(a) Tire cord strength (kgf) and elongation at break (%)

Dried at 107 DEG C for 2 hours, and then measured at a sample length of 250 mm and a tensile rate of 300 m / min using a low speed elongation tensile tester manufactured by INSTRON. The elongation at specific load was measured at a load of 4.5 kg.

(b) Dry Heat Shrinkage (%, Shrinkage)

The ratio of the length (L0) measured at a constant load of 0.05 g / d and the length (L1) after treatment at a constant load of 0.05 g / d for 30 minutes at 150 ° C To show dry heat shrinkage ratio.

S (%) = (L0 - L1) / L0 100

(c) tire code E-S 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.

E-S = moderate elongation (%) + dry heat shrinkage (%)

(d) My fatigue

The residual fatigue strength was measured by using a Belt Fatigue Tester, which is commonly used for fatigue test of tire cords, and fatigue resistance was compared. Fatigue test conditions were 28 ~ 30 EPI (Ends Per Inch) spaced cord with rubber overlaying, and then vulcanized at 160 ℃ for 20 minutes to make specimens. The load was 70kg in a flex fatigue tester The test was repeated 60,000 times at room temperature. After the fatigue test, the rubber and cord were separated and the residual strength was measured. The residual strength was measured by a conventional tensile strength tester after drying at 107 占 폚 for 2 hours in accordance with the above method (a).

(e) Tire cord polymerization degree (DP) Lowering rate (%)

The intrinsic viscosity [IV] of the dissolved cellulose was measured in a concentration range of 0.1 to 0.6 g / dl at 25 DEG C with a 0.5 M cupriethylenediamine hydroxide solution prepared according to ASTM D539-51T using a Ube load viscometer. The intrinsic viscosity is obtained by extrapolating the non-viscosity according to the concentration and substituting this into the Mark-Houwink equation to determine the degree of polymerization.

[IV] = 0.98 ^{- 2} DPw ^{0 .9}

First, the DP (Do) of the raw cord before the heat treatment is measured, the DP (D ₁ ) of the heat-treated cord is measured after the heat treatment, and the rate of decrease is calculated by the following equation.

DP reduction rate (%) = (Do - D ₁ ) / Do x 100

≪ Examples 1-2 >

A cellulose solution prepared using Buckeye's V-81 pulp with DPW of 1200 (? -Cellulose content: 97%), NMMO ₂ O and 0.045 wt% propyl gallate was used. At this time, the concentration of cellulose was 11.5%, and soybean oil having 10 epoxy groups in the molecular structure and three alkyl chain having 15 carbon atoms was added as an additive. The proportion of the additive was 0.6 to 3.0 wt% based on the total solution, the number of orifices was 1,000, and the diameter of the orifice was 200 mu m. The solution discharged from the nozzle was cooled with a length of 100 mm as an air gap, the spinning speed was 150 m / min, and the final filament fineness was 1,500 denier. The coagulation temperature was 23 ℃, the concentration was 80%, and the concentration of NMMO was 20%. The temperature and concentration of the coagulation solution were continuously monitored using a refractometer. Filaments exiting the coagulation bath remove the remaining NMMO by washing. After the primary emulsion treatment device, it was dried and then subjected to secondary emulsion treatment and wound. Twenty 400 TPM twists were given to each of the two lyocell yarns, and they were folded together to give a twist of 400 TPM to produce the raw cord. The obtained raw 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.

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 the following components were added:

300 parts by weight of 40 wt% VP-latex, 129 parts by weight of distilled water, 28% ammonia water, 23.8 parts by weight After the components were added, they were aged at 25 캜 for 20 hours to maintain a solid content concentration of 19.05%.

After the adhesive solution was applied and dried at 150 캜 for 2 minutes, the adhesive treatment was terminated by heat treatment at 170 캜 for 60 seconds. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

≪ Comparative Example 1 &

A raw cord and a dip cord were prepared in the same manner as in Example 1, except that 0 wt% of an additive was added to the cellulose solution. The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

division Processing Code Properties Power (kg) My fatigue (%) Additive ratio (wt%) Example 1 16.4 43.3 0.6 Example 2 14.2 18.0 3.0 Comparative Example 1 17.0 9.5 -

≪ Example 3 >

A radial tire manufactured by using the dip 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 cords were as shown in the following Table 2, and they were aligned at an angle of 90 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 portion 35 has a bead core 36 having a high strength steel wire 4 having a diameter of 0.95 to 1.00 mm and a bead filler 37 having a hardness of 40 or more and a shore A hardness of 40 or more. The belt 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 so that the cap ply cords in the cap ply 39 are parallel to the circumferential direction of the tire Respectively.

<Example 4>

A tire was produced in the same manner as in Example 3, except that the cord material for tire fabrication was a dip cord manufactured in accordance with Example 2.

&Lt; Comparative Example 2 &

A tire was produced in the same manner as in Example 3, except that the cord material for tire fabrication was a dip cord manufactured by Comparative Example 1.

Example 3 Example 4 Comparative Example 2 Kakas Material PET PET PET Specification (d / summing speaker) 1500d / 2 1500d / 2 1500d / 2 Power (kg) 24 24 24 Modulus of elasticity (g / d) 60 60 60 Cap fly Material The dip code of Example 1 The dip code of Example 2 The dip code of Comparative Example 1 tire Flat rate 0.60 0.60 0.60 Number of carcass layers One One One Cap fly layer number One One One

&Lt; Example 5 >

A radial tire manufactured using the dip cord 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 two layers. The specifications of the cap ply and carcass cord were as shown in Table 3 below, and tires were produced in the same manner as in Example 3. [

&Lt; Example 6 >

A tire was produced in the same manner as in Example 3, except that the cord material for tire fabrication was a dip cord manufactured in accordance with Example 2.

&Lt; Comparative Example 3 &

A tire was produced in the same manner as in Example 3, except that the cord material for tire fabrication was a dip cord manufactured by Comparative Example 1.

Example 5 Example 6 Comparative Example 3 Kakas Material The dip code of Example 1 The dip code of Example 2 The dip code of Comparative Example 1 Cap fly Material Nylon 6,6 Nylon 6,6 Nylon 6,6 Specification (d / summing speaker) 1260D / 2P 1260D / 2P 1260D / 2P Power (kg) 22.4 22.4 22.4 tire Flat rate 0.60 0.60 0.60 Number of carcass layers 2 2 2 Cap fly layer number One One One

The 205/65 R15 V tire manufactured according to Examples 3, 4, 5, 6 and Comparative Examples 2 and 3 was mounted on a 2000cc class passenger car, and the noise generated in the vehicle was measured while traveling at a speed of 60 km / h The values of the audible frequency range are expressed in terms of noise (dB). The steerability and ride quality are evaluated by a skilled driver on a test course in five points on a scale of 100, and the results are shown in Table 4 below. The durability was measured in accordance with the P-metric tire endurance test of FMVSS 109 at a temperature of 38 ° C (Celsius), 85, 90 and 100% of the rated tire load, at a running speed of 80 km / h And it was judged as OK (OK) when no traces such as bead separation, cord cutting, belt separation were found in any part such as tread, sidewall, carcass cord, inner liner and bead.

division Tire weight
(kg) Ride comfort Steering stability durability Uniformity Noise (dB) Example 3 9.54 100 100 OK 100 61.2 Example 4 9.70 100 100 OK 100 61.4 Comparative Example 2 9.60 96 95 OK 96 63.5 Example 5 9.64 100 100 OK 100 60.4 Example 6 9.70 100 100 OK 100 61.0 Comparative Example 3 9.60 93 94 OK 92 64.3

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. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

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 (4)

A lyocell heat-treated cord comprising a lyocell multifilament made from a cellulose solution,
Wherein the cellulose solution comprises 0.6 to 5% by weight of an additive of soybean oil relative to the whole cellulose solution,
The additive of the soybean oil is a structure having at least 3 and at most 15 epoxy groups in the molecular structure and at least three alkyl group chains having at least 10 carbon atoms,
The lyocell multifilament has a cross-sectional porosity of 1 to 30%
The lyocell heat treatment cord is manufactured by immersing a lyocell raw cord made of at least two lyocell multifilaments in a dipping solution and curing the lyocell cord,
Wherein the fatigue strength of the lyocell is 10% or more.
delete A pair of parallel bead cores and at least one radial carcass layer wound around the bead cores, a belt layer laminated on the outer circumferential side of the carcass layer, and a radial air layer including a circumferential belt reinforcing layer formed on the outer circumferential side of the belt layer In the mouth tires,
Wherein the carcass layer comprises a lyocell heat treated cord according to claim 1, wherein the carcass layer is used as one or two layers.
A pair of parallel bead cores and at least one radial carcass layer wound around the bead cores, a belt layer laminated on the outer circumferential side of the carcass layer, and a radial air layer including a circumferential belt reinforcing layer formed on the outer circumferential side of the belt layer In the mouth tires,
Wherein the cap ply as the belt reinforcing layer comprises the lyocell heat treated cord according to claim 1, wherein the cap ply is used as one or two layers.

Images