KR100530703B1 - Process for preparing lyocell tire cord for passenger tire-cap ply - Google Patents

Abstract

The present invention relates to a manufacturing method and a dipping method of a lyocell tire cord for application to a cap ply for a passenger car, wherein the lyocell tire cord manufactured by the above method is excellent in high temperature form stability, elongation characteristics and fatigue resistance.

Description

Process for preparing lyocell tire cord for passenger car tire cap fly {Process for preparing lyocell tire cord for passenger tire-cap ply}

Conventional radial tires consist of a carcass ply reinforced with rubber with fiber cords such as polyester or rayon, and a belt structure reinforced with rubber with steel cords. In addition, the bead wire is reinforced in the contact portion between the tire and the rim to prevent the tire from falling off the rim and to maintain stability, which also serves to fix the carcass ply.

In the first pneumatic tire, cotton canvas was used as a carcass material, and along with the development of artificial fibers, fiber cords such as rayon, nylon, and polyester have been used as materials for carcass plies. Etc. are used.

In general, polyester is commonly used as a carcass ply material for pneumatic radial tires, and more specifically, pneumatic radial tires having a flat ratio of 0.65-0.82. In addition, high speeds having a flat ratio of less than flatness and more specifically less than 0.6 are used. Rayon is relatively used as a carcass ply reinforcement for pneumatic radial tires. Recently, some high-speed, low-flat ratio radial tires use polyester, but their application is limited because of their low temperature properties and shape stability compared to rayon.

In recent years, the performance of tires has been continuously improved according to the improvement of the road environment and the performance of the vehicle, and in particular, it is recognized that safety is more important as the quality of the tire as the weight of the vehicle increases and the limit speed increases. In line with the demand for increasing tire safety, tire safety standards are also changing, and the tire industry is actively researching methods for providing tire safety.

A method of imparting a cap fly to a tire for a passenger car has also been widely used as one of the methods for imparting safety to a tire. In particular, in recent years, a tire having such a cap fly has been generalized and widely applied. The cap flap is a part that maintains the shape stability of the tire by winding it continuously in the circumferential direction of the tire between the tire tread and the part and the steel cord layer for belt reinforcement. It is common to reinforce using. When the vehicle is running, a load is applied in the axial direction of the tire cord, and the tire cord is repeatedly deformed and recovered in the axial direction by this load, and in this deformation-recovery, the tension-load at the time of deformation and recovery. The curve occurs along the other curve, where the work loss of the tire cord itself occurs due to the deformation caused by the tensile load and the difference in the recovery curve when the load is removed. This work loss contributes to the temperature rise of the tire and the tire cord. In addition, the work loss causes energy loss while the tire rotates, resulting in energy loss while driving. This energy loss leads to the rolling resistance of the vehicle, and in general, when using materials having high energy loss characteristics, the fuel efficiency of the vehicle is increased due to the increased rolling resistance of the tire and the temperature of the tire is increased due to driving. do. The role of the cap ply material is to prevent the size of the tire from increasing while the cap ply contracts when the temperature of the tire increases due to the driving of the vehicle. In such a case, since the tire does not increase in size, an increase in tire rotational inertia is prevented. As a result, an increase in fatigue life and an increase in durability can be imparted to the tire by suppressing heat generation of the tire along with a decrease in energy consumption.

In general, the most widely used material for the cap ply material is nylon 66, which is known to be due to the high shrinkage force of nylon 66. The part where the cap ply reinforces is known as the part with the highest temperature during driving on the tire. In addition to the heat shrinkage force, a material having a property of low heat resistance, that is, a decrease in physical properties due to heat, is required. Must be used. Nylon 66 is the material used for tire cords with these properties. The research on applying to cap plies using other materials such as PET or PEN is also underway, but these materials are weak to heat, and in particular, the material has a limitation in being applied to cap plies due to a large decrease in adhesive strength due to heat.

Other materials used in the cap ply are aramid, but the use of aramid is different from that of nylon 66. Aramid fibers are aromatic polyamide fibers, polyamide fibers having a benzene ring in a repeating unit. It is a material that shows stable physical properties even at high temperatures. When applied to a tire cap ply, the contraction force at high temperatures cannot be expected. However, since the physical property deterioration is very low even at high temperatures, deformation itself is suppressed and thus a similar effect to the result of applying nylon cap ply. It has the feature to The use of such aramid fibers is also increasing, but in the case of aramid fibers, there is a problem of low fatigue resistance, the price is very expensive, there is a problem that is limited to use.

The present invention has been invented to solve the above problems, to provide a lyocell tire cord for applying to the cap ply of a pneumatic radial tire for a passenger car.

In order to achieve the above object, the present invention provides a cap fly cord for a passenger car tire through the following processes.

First, as a preliminary step for manufacturing a lyocell cap fly cord, the preparation of a lyocell multifilament is manufactured using the following process.

 i) dissolving cellulose in an N-methylmorpholine N-oxide (hereinafter NMMO) / water mixed solvent to prepare a spinning stock solution (Dope); ii) an orifice having a diameter of 100 to 300 µm and a length of 200 to 2,400 µm, the spinneret including an orifice having a ratio of diameter to length (L / D) of 2 to 8 times and an interval between 2.0 and 5.0 mm between orifices; Extruding the spinning stock solution through the fibrous spinning stock solution to allow the fibrous spinning stock solution to pass through an air layer to reach a conical upper coagulation bath, and then coagulate to obtain a multifilament; iii) introducing the obtained multifilament back into the lower coagulation bath, changing the direction of travel thereof, and introducing it into a water washing bath to wash it; And iv) drying and emulsifying the washed multifilament.

Hereinafter, the lyocell multifilament process of the present invention will be described in more detail step by step.

In the method according to the present invention, in step iii), cellulose is dissolved in N-methylmorpholine N-oxide (hereinafter, NMMO) / water mixed solvent to prepare a spinning stock solution (Dope).

In order to manufacture the lyocell multifilament for tire cords according to the present invention, pulp having high purity of cellulose should be used. In general, lignin has an amorphous structure and hemicellulose (hemicelluose) is known to have a low crystalline structure, so in order to produce high quality cellulose fibers, it is preferable to minimize such components and use a high content of α-cellulose. By using high cellulose molecules with high orientation structure and high crystallization, excellent physical properties can be expected. Preferably, DP 800 or 1,200, soft wood pulp (soft wood pulp) of 93% or more α-cellulose content is used.

In the process according to the invention, N-methylmorpholine N-oxide (NMMO) / water mixed solvent is used as a solvent in the spinning stock solution, NMMO is more preferably 13 wt% in the water content of 10 to 20 wt% range Use NMMO hydrate adjusted to%.

In the method according to the present invention, preparing a high homogeneous high concentration spinning stock solution by increasing the penetration of the solvent is an essential element for producing a fiber having excellent physical properties, for this purpose, a device capable of imparting high shear stress is required. Appropriate dissolution temperatures in the range of 80 to 130 ° C. should be formed. If the dissolution temperature is higher than 130 ℃, there is a problem that the molecular chain end groups increase due to the molecular weight decrease by the thermal decomposition of cellulose, which lowers the mechanical properties and causes the decomposition of NMMO, if less than 80 ℃ time required for sufficient dissolution And an increase in energy and a low concentration of cellulose solution.

In addition, in order to prepare a homogeneous spinning stock solution in which undissolved cellulose particles do not exist, a step of uniformly mixing cellulose with liquid NMMO before the dissolution process and then infiltrating and swelling the liquid NMMO inside the cellulose powder is essential.

In the present invention, a method for producing a highly homogeneous cellulose solution may be used. However, as an example of using a kneader, the powdered cellulose is injected into a kneader together with the concentrated liquid NMMO, and then in the kneader. Mixing is repeated for dispersing, shearing, pressing, stretching, and overlapping, followed by pasting the swollen cellulose powder and injecting it continuously into an extruder connected to the kneader to dissolve.

Another method for producing cellulose solution in the present invention is the swelling and homogenization of the supplied solid NMMO and powdered cellulose through a twin screw extruder arranged with screws to disperse, mix, shear, kneading, dissolving and metering performance. It is made of a cellulose solution.

In step ii) of the method according to the present invention, an orifice having a diameter of 100 to 300 µm and a length of 200 to 2.400 µm, wherein the ratio (L / D) of the diameter to the length is 2 to 8 times and the spacing between the orifices is 2.0 to The spinning stock solution is extruded through a spinning nozzle including a plurality of orifices of 5.0 mm, so that the fibrous spinning stock passes through the air layer to reach a conical upper coagulation bath, and then coagulates to obtain a multifilament.

FIG. 1 schematically shows a spinning process according to the present invention. When the cellulose solution is quantitatively supplied from the gear pump 1 in FIG. 1, the radiation source solution extracted through the spinning nozzle 2 is an air layer in a vertical direction. Pass 3) to reach the interface of the coagulating solution. The spinning nozzle 2 used is usually circular in shape, having a nozzle diameter of 50 to 160 mm, more preferably 80 to 130 mm. If the nozzle diameter is less than 50 mm, the distance between the orifices is too short to reduce the cooling efficiency of the solution and adhesion may occur before the discharged solution is solidified, while if the nozzle diameter is too large, peripheral devices such as the spinning pack and the nozzle become large, which is disadvantageous in terms of equipment. Do. In addition, if the diameter of the nozzle orifice is less than 100 µm, a large number of trimmings occur during spinning, which adversely affects radioactivity. If the nozzle orifice exceeds 300 µm, the solidification rate of the solution in the coagulation bath after spinning is slow, Is hard. If the length of the nozzle orifice is less than 200 μm, the orientation of the solution is poor, and thus the physical properties are bad. If the length of the nozzle orifice is more than 2,400 μm, excessive cost and effort are required to manufacture the nozzle orifice.

Considering the tire cord and the industrial in terms of use, considering the orifice spacing for uniform cooling of the solution, the number of orifices is 500 to 1,500, more preferably 800 to 1,200. Until now, the development of industrial lyocell fibers has been attempted, but there have been no reports on the development of high strength filaments such as tire cords, because the more the number of filaments radiated, the greater the impact on radioactivity and high spinning technology is required. In order to solve this problem, the present invention employs a spinneret 2 including an orifice that satisfies the above-described specific condition within the above range. If the number of orifices is less than 500, the fineness of each filament becomes thick, so that NMMO is not sufficiently released in a short time, so that solidification and washing are not completed. If the number of orifices is more than 1,500, it is easy to produce close filaments and close-ups in the air layer section, and the stability of each filament decreases after spinning. Can cause.

When the fibrous spinning stock solution passing through the spinning nozzle 2 solidifies in the upper coagulating solution, the larger the diameter of the fluid, the greater the difference in the coagulation rate between the surface and the inside, so that it is difficult to obtain a dense and uniform fiber. It gets hard. Therefore, even when the cellulose solution is spun, the same discharge amount can be obtained into the coagulating solution with a smaller diameter by maintaining the appropriate air layer 3. Too short air gap distances increase the rate of micropores generated during rapid surface layer solidification and desolvation, which hinders the increase in elongation ratio, while too long air gap distances are associated with the effects of filament adhesion, ambient temperature, and humidity. It is difficult to maintain process stability by receiving a lot. The air layer is preferably 20 to 300 mm, more preferably 30 to 200 mm.

When passing through the air layer (3), the filament is cooled and solidified to prevent fusion and at the same time to supply cooling air to increase the penetration resistance to the coagulating liquid, to supply the cooling air to grasp the atmosphere of the air layer (3) A sensor 5 is attached between the inlet of the device 6 and the filament to monitor temperature and humidity to adjust the temperature and humidity. In general, the temperature of the supplied air is maintained in the range of 5 ℃ to 20 ℃. If the temperature is less than 5 ° C is filament solidification is accelerated to disadvantage the high-speed spinning, if the temperature is higher than 20 ° C, the penetration resistance to the coagulation liquid interface is poor, and trimming may occur.

In addition, the moisture content in the air is an important factor that can affect the filament coagulation process, the relative humidity in the air layer (3) should be adjusted to RH 10% to RH 50%. More specifically, RH 10% to 30% of dried air near the nozzle and RH 30% to 50% of wet air near the coagulating liquid improve stability in terms of filament solidification rate and fusion of the spinneret surface. Can be. Cooling air is blown horizontally on the side of the filament discharged vertically, the wind speed is advantageously in the range of 1 to 10 m / sec, more preferably in the range of 2 to 7 m / sec. If the wind speed is too low, the cooling air cannot prevent other atmospheric conditions around the filament discharged to the air layer, and it is difficult to produce a uniform filament by causing a difference in solidification rate and trimming of the filament where the cooling air reaches the latest on the spinning nozzle. If it is too high, the filament yarn shakes, which hinders the risk of sticking and the uniform coagulating fluid flow, thus impairing the radiation stability.

The composition of the upper coagulation bath used in the present invention is such that the concentration of the NMMO aqueous solution is 5-20%.

When the filament passes through the upper coagulation bath 4, if the spinning speed increases by 50 m / min or more, the shaking of the coagulation solution is severed by friction between the filament and the coagulation solution. In order to improve productivity by extending the excellent physical properties and spinning speed through the stretching orientation, such a phenomenon is a factor that impairs process stability, it is necessary to minimize it. Therefore, a donut-shaped mesh network 7 is installed on the surface of the upper coagulation bath 4 and the coagulation bath is designed to flow the coagulating liquid downward in the same direction as the direction of the filament, so that the stretching orientation is natural. Allow it to proceed.

In the step iii) of the method according to the invention, the obtained multifilament is introduced again into the lower coagulation bath 8, the direction of travel thereof is introduced into the water washing bath, and the lower coagulation bath 8 is the upper coagulation bath ( In 4), the coagulating liquid 10 flowing down along with the filament is collected, and a roller 9 for converting in the horizontal direction is installed inside the lower coagulation bath 8. The roller 9 is rotated to reduce the frictional resistance. The concentrations of the upper coagulation bath 4 and the coagulation liquid are equal or equal to or less than 0.5%. A control bath is installed separately to circulate, so that the concentrations of the upper coagulation bath 4 and the lower coagulation bath 8 are the same. Or within 0.5%. As the filament passes through the upper coagulation bath (4) and the lower coagulation bath (8), the desolvent and the stretching are performed at the same time, which has a great influence on the formation of physical properties. The filament that has passed through the lower coagulation bath 8 is washed in the washing bath. The washing method follows a conventional method known in the art.

In the step iii) of the method according to the invention, the multifilament having been washed with water is dried and wound by winding. Drying, tanning and winding processes are in accordance with known conventional methods. After drying and winding process, it is supplied as tire cord and industrial filament yarn.

The multifilament produced by the process according to the invention is a lyocell multifilament with a total denier range of 1,000 to 2,500 and a cutting load of 9.0 to 15.0 kg. The multifilament is composed of 500 to 1500 individual filaments having a fineness of 0.5 to 4.0 denier.

In the present invention, in manufacturing a lyocell cord using the lyocell multifilament yarn, a step of giving a lead to the cord as a previous step of the deep cord manufacturing. In order to achieve the purpose of providing a cord for a lyocell cap fly, it is necessary to adjust the tension in the softening step to have a range of 150 to 250 g per head to have sufficient fatigue resistance even after the cap fly cord is manufactured. If the tension exceeds 250g per head, the density of the lyocell tire cord is sufficient, but the fiber is damaged due to the large load applied to the cord in the twisting process, thus reducing the strength and reducing the stiffness. Will occur. If the yarn tension is less than 150g per head, it shows sufficient cutting after heat treatment, but if the density of the cord is so low that the DPU is immersed in the heat treatment solution, the DPU is too high to secure sufficient fatigue resistance.

As a post-twisting step, it is possible to provide a lyocell cap fly cord which achieves the above object only by heat treatment under appropriate conditions.

In the present invention, the adhesive treated for adhesion may use all conventionally used one-ray adhesive for rayon, one-bath adhesive for nylon, or two-bath adhesive for PET, and when using the adhesive liquid, The object of the present invention can be achieved only by performing adhesive treatment using the following conditions.

Such adhesion treatment can be performed under the following conditions when using a conventional two-bath dipping machine. That is, the untreated lyocell cord is transferred to a dipping machine and dried for 90 to 150 seconds at about 100 degrees in the step before applying the dipping liquid. If the drying time is longer than 150 seconds, the strength of the tire cord is increased but the stiffness is decreased. If the drying time is short, the drying time is not enough to prevent the reaction with the adhesive liquid. The result is a decrease.

Figure 2 is an example schematically showing a dipping process according to the present invention.

Hereinafter, FIG. 2 will be described in more detail as follows.

In the present invention, the adhesive liquid for adhesion of the lyocell cord and rubber is prepared using the following method.

29,4 wt% resorcinol 45.6

Pure 255.5

37% formalin 20

10wt% sodium hydroxide 3.8

After preparing the reaction, the reaction was stirred at 25 ° C for 5 hours, and then the following components were added.

40wt% VP-Latex 300

Pure 129

28% ammonia water 23.8

After the ingredient is added, the mixture is aged at 25 degrees for 20 hours to maintain a solid concentration of 19.05%.

After the drying, the adhesive liquid is imparted. In order to adjust the adhesion amount of the adhesive liquid, it is preferable to add a stretch of 0-3%, and more preferably, a stretch of 1-2% is required. If the stretch is too high, the adhesion amount of the adhesive solution can be controlled, but the result is a decrease in the elongation, resulting in a decrease in fatigue resistance, and if the stretch is too low, for example, less than 0%, the lyocell Dip fluid penetrates into the cord, making it impossible to control the DPU. The adhesive amount is preferably 4% -6% by weight of the fiber based on the solid content. After passing through the adhesive liquid is dried at 120-150 degrees. The drying is carried out for 180 seconds to 220 seconds, and when the cord is dried, it is also important to dry the cord with a stretch of about 1% -2% to achieve the object of the present invention. In the case of lack of stretch, the core body and the length of the cord increase, which is insufficient to be applied to the cap ply. If the stretch is more than 3%, the middle body level is appropriate, but the length of the body is too low. Will occur. After drying, heat treatment is performed in a temperature range of 130 to 170 degrees. The stretch during the heat treatment is maintained between -2-0%, the heat treatment time is appropriate 50 seconds-90 seconds. If the heat treatment is less than 50 seconds, the reaction time of the adhesive liquid is insufficient, resulting in low adhesive strength. If the heat treatment is longer than 90 seconds, the hardness of the adhesive liquid is increased, resulting in a decrease in fatigue resistance of the cord. Will be imported.

The present invention mainly describes the case of dipping using a two-bath dipping machine, but those skilled in the art will be able to perform heat treatment under the same conditions using a one-bath dipping machine.

Figure 3 is an example schematically showing the structure of a tire for a passenger car manufactured by using a lyocell deep cord according to the present invention in a cap fly cord.

3 will be described below in more detail.

The bead regions 15 of the tire 11 each have an annular bead core 16 that is inextensible. The bead core is preferably made of a single or single filament steel wire wound continuously. In a preferred embodiment, high strength steel wires of 0.95 mm-1.00 mm diameter form a 4x4 structure, and it is also possible to form a 4x5 structure.

In certain embodiments of the present invention, the bead region also has a bead filler 17, in the case of the bead filler, it is necessary to have a hardness of at least a certain level, preferably Shore A hardness of 40 or more is preferred.

In the present invention, the tire 11 is reinforced by the crown portion by the belt 18 and the cap ply 19 structure. The belt structure 18 comprises two cutting belt plies 20 and the cords 21 of the belt plies are oriented at an angle of about 20 degrees with respect to the circumferential central surface of the tire. The cord ply 21 of the belt ply is arranged opposite to the direction of the cord 22 of the other belt ply in a direction opposite the circumferential central plane. However, the belt 18 may comprise any number of plies and may preferably be arranged in the range of 16-24 °. The belt 18 serves to provide lateral rigidity to minimize the rise of the tread 23 from the road surface during operation of the tire 11. The cords 21 and 22 of the belt 18 are made of steel cords, and have a 2 + 2 structure, but may be made of any structure. The cap ply 21 and the edge ply 24 are reinforced on the upper portion of the belt 18.

The cap fly cord 25 in the cap fly 19 is reinforced in parallel to the circumferential direction of the tire to suppress the size change in the circumferential direction due to the high speed rotation of the tire, and the cap fly cord having a large heat shrinkage stress at a high temperature. (25) is used.

In the present invention, the capply cord is manufactured from a lyocell deep cord excellent in high temperature form stability, elongation characteristics, and fatigue resistance described above.

One layer of cap ply 19 and one layer of edge ply 21 may be used, but preferably, 1-2 layers of cap ply and also 1-2 layers of edge ply are reinforced.

[Examples and Comparative Examples]

In order to achieve the object of the present invention, it becomes more apparent from the description of the following examples. However, the present invention is not limited to the following examples.

<Example 1>

In order to prepare the fiber for tire reinforcement, cellulose was dissolved in a tertiary amine solvent as described above, and then lyocell filament fibers were obtained through wet and dry spinning. When the obtained lyocell fibers were twisted at 1650 denier / 2 gops, the yarn tension was maintained at 200 g per head. The number of years was 470 TPM, and the same condition was performed.

The obtained lyocell record was dried at 100 degrees for 130 seconds, and then passed through an adhesive solution prepared by the following method to give an adhesive solution. During drying, 2% of stretch was added to prevent non-uniformity of the record due to heat shrinkage.

29,4 wt% resorcinol 45.6

Pure 255.5

37% formalin 20

10wt% sodium hydroxide 3.8

After preparing the reaction, the reaction was stirred at 25 ° C for 5 hours, and then the following components were added.

40wt% VP-Latex 300

Pure 129

28% ammonia water 23.8

After the ingredient is added, the mixture is aged at 25 degrees for 20 hours to maintain a solid concentration of 19.05%.

After giving an adhesive liquid, it dried for 2 minutes at 150 degreeC, and heat-processed for 1 minute at 170 degreeC, and the adhesive process was complete | finished.

H-test was performed to measure the initial adhesive strength of the prepared deep cord rubber. H-test measures the maximum load that the rubber-cord separation occurs by pulling both rubbers while keeping both ends of the deep cord embedded in 9.5mm rubber lumps and keeping the distance between the rubber lumps at both ends 9mm. It is a method of evaluating adhesive force. In addition, by vulcanizing at a temperature of 160 degrees and 25 kg / cm ² for 20 minutes before adhesive force evaluation, sufficient strength is given to a rubber and it measures. The rubber composition used in the test was 100 parts of natural rubber, 3 parts of zinc oxide, 28.9 parts of carbon black, 2 parts of stearic acid, 7.0 parts of pintar, 1.25 parts of MBTS, 3 parts of sulfur, 0.15 parts of diphenyl guanidine and phenylbeta naphthylamine 1.0 part is mix | blended.

In addition, the elongation test, fatigue resistance test and shrinkage stress were measured to evaluate whether the physical properties of the prepared deep cords are suitable for capply use. The elongation test was performed using a cord grip at a gripping distance of 25 cm and a tensile speed of 300 mm / min using a general universal tensile tester. After drying for 2 hours at 107 degrees, the temperature was reduced by leaving it in a desiccator for 30 minutes. Measured. The shrinkage stress was measured at 177 ° C for 2 minutes using a Testrite oven, and the weight given to fix the cord was 0.05g / d load.

As a method for evaluating fatigue resistance, a belt fatigue fatigue tester was used. The belt fatigue fatigue tester is a fatigue tester having a structure shown in FIG. 2, which is a device for repeatedly applying a bending deformation and evaluating the fatigue resistance of a tire cord according to bending. The fatigue resistance test conditions were made by measuring the strength after 100,000 cycles of fatigue with a roller diameter of 12.5 mm, a test temperature of 80 degrees, and an rpm of 200.

Table 1 shows the detailed results according to the example.

<Example 2>

In yarn yarn lyocell fibers in 1650 denier / double sum, the yarn tension was maintained at 200g per head. The number of years was 470 TPM, and the same condition was performed.

After drying the cord with the obtained lyocell for 120 second at 100 degree | times, it passed through the adhesive liquid prepared by the following method, and provided the adhesive liquid. During drying, 1% of stretch was added to control the non-uniformity of the record due to heat shrinkage.

29,4 wt% resorcinol 45.6

Pure 255.5

37% formalin 20

10wt% sodium hydroxide 3.8

After preparing the reaction, the reaction was stirred at 25 ° C for 5 hours, and then the following components were added.

40wt% VP-Latex 300

Pure 129

28% ammonia water 23.8

After the ingredient is added, the mixture is aged at 25 degrees for 20 hours to maintain a solid concentration of 19.05%.

After applying an adhesive liquid, it dried for 180 second at 150 degree | times, and heat-processed for 90 second at 170 degree | times, and the adhesive process was complete | finished.

The detailed results are shown in Table 1.

Comparative Example 1

For comparison, a dip was performed using a dipping method of rayon fibers which is widely used now. The drying / heat treatment temperature after drying / dip solution was equally 140 degrees, and a 2% stretch was given upon drying before dipping liquid application. Each treatment condition was treated for 120 seconds to obtain a lyocell cord treated.

Comparative Example 2

For comparison, a lyocell cord was prepared by performing heat treatment without imparting a stretch during drying. All of the conditions were the same as those of Example 1, but the result was a reduction in the resulting fatigue resistance as the dip solution penetrated into the cord due to not giving a stretch during drying.

<Comparative Example 3>

The deep cord was prepared by applying the same conditions as those of Example 1, but adding 4% of the stretch during drying after applying the dip solution. As a result, the cut was too small and fatigue resistance was significantly reduced.

Comparative Example 4

For comparison, the yarn was subjected to the yarn in the tension condition of 400g level by increasing the tension during the yarn to prepare a lyocell cord for cap fly. Except for the tension with Example 1 were the same, but as a result showed a decrease in the length / strength / fatigue.

Table 1 Examples and Comparative Examples According to the Invention

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Yarn Denier 1650 ← ← ← ← ← Twist (top / bottom) 470/470 ← ← ← ← ← Yarn strength (Kg) 11.5 ← ← ← ← ← Speaker power 200 g 200 g 200 g 200 g ← 400 g Drying time 130 seconds 120 seconds ← 130 seconds ← ← Primary drying temperature 100 degrees ← 140 degrees 100 degrees ← ← Primary dry stretch (%) 2% One% 2% 0% 4% 2% Dip Liquid Type PET 2 bath solution ← ← PET 2 bath solution ← ← Secondary drying temperature 150 degrees ← 140 degrees 150 degrees ← ← 2nd drying time 120 seconds 180 seconds 120 seconds 120 seconds ← ← Secondary dry stretch (%) One% ← ← One% ← ← Heat treatment temperature 170 degrees ← 140 degrees 170 degrees ← ← Heat treatment time 60 seconds 90 sec 120 seconds 60 seconds ← ← Heat Treatment Stretch (%) 0% ← ← 0% ← ← Cord strength (Kg) 17.3 15.5 14.3 15.7 16.0 14.2 God of Code (@ 4.5Kg) 1.7% 2.0% 1.9% 2.5% 1.5% 2.2% Body cut (%) 7.0% 7.3% 5.9% 6.1% 5.0% 6.4% Retraction force (177 degrees x 2 minutes) 0.15 g / d 0.14 g / d 0.05g / d 0.02 g / d 0.20 g / d 0.14 g / d Adhesion 14.0 14.3 12.4 13.9 13.4 12.0 Fatigue fatigue strength retention rate 88% 87% 70% 73% 55% 48%

The present invention relates to a manufacturing method and a dipping method of a lyocell tire cord for application to a cap ply for a passenger car, wherein the lyocell tire cord manufactured by the above method is excellent in high temperature form stability, elongation characteristics and fatigue resistance.

While the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims. .

1 is an example schematically showing a spinning process according to the present invention.

Figure 2 is an example schematically showing a dipping process according to the present invention.

Figure 3 is an example schematically showing the structure of a tire for a passenger car manufactured by using a lyocell deep cord according to the present invention in a cap fly cord.

Claims (6)

In the method for manufacturing a lyocell deep cord using lyocell multifilament, After the lyocell multifilament is twisted with a twister to prepare a raw cord, it is first dried for 90 seconds to 150 seconds at 90 to 110 ° C. and 1 to 3% stretch condition, and then the adhesive is applied, and 120 to 150 ° C. and 1 to After drying 180 to 220 seconds at 2% stretch conditions, 150 to 170 ℃, -1-0% stretch conditions, a method for producing a lyocell deep cord, characterized in that the heat treatment for 50-90 seconds. A lyocell deep cord manufactured by the method of claim 1, wherein the lyocell dip cord is 7% or more. The method of claim 2, Lyocell deep cord, characterized in that the adhesive strength of more than 14kg. The method of claim 2, Lyocell deep code, characterized in that the strong retention after fatigue is more than 80%. The method of claim 3, wherein Lyocell deep code, characterized in that the strong retention after fatigue is more than 80%. A radial tire for a passenger car in which the lyocell deep cord according to any one of claims 2 to 5 is applied to a capplier.