KR101594150B1 - Polyester fiber, method for preparing the same and tire cord including the same - Google Patents
Polyester fiber, method for preparing the same and tire cord including the same Download PDFInfo
- Publication number
- KR101594150B1 KR101594150B1 KR1020140124291A KR20140124291A KR101594150B1 KR 101594150 B1 KR101594150 B1 KR 101594150B1 KR 1020140124291 A KR1020140124291 A KR 1020140124291A KR 20140124291 A KR20140124291 A KR 20140124291A KR 101594150 B1 KR101594150 B1 KR 101594150B1
- Authority
- KR
- South Korea
- Prior art keywords
- weight
- polyester fiber
- tire cord
- treatment liquid
- diisocyanate
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/395—Isocyanates
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/55—Epoxy resins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
Abstract
Description
The present invention relates to a polyester fiber treated with a diisocyanate and an epoxy compound having a lowered dissociation temperature to a polyester fiber as a primary treatment liquid, a method for producing the polyester fiber, and a tire cord comprising the polyester fiber, And the fatigue resistance of the tire can be improved to improve the processability of the tire manufacturing and also to manufacture a high performance tire cord capable of preventing the peeling phenomenon between the rubber and the fiber occurring at the time of high speed traveling.
Generally, a polyester fiber reinforcement represented by polyethylene terephthalate has excellent mechanical strength, elastic modulus, dimensional stability and heat resistance, which are important characteristics of a rubber reinforcing material. Therefore, a rubber synthetic material such as a tire, a belt, It is widely used as a reinforcing material for hoses and the like. Particularly, in the field of tire reinforcing materials, there has been a need for a reinforcing material having a higher performance in accordance with the high performance of automobiles, the development of traveling roads, and the severe use of rubber synthetic materials. However, since the surface of the polyester fiber is inactive, the adhesive strength to the rubber is poor. Therefore, a method of improving the adhesiveness of the fiber to rubber by treating epoxy and diisocyanate compound on the surface of the fiber has been studied for a long time.
In the case of an adhesive mainly comprising an epoxy and a diisocyanate compound, the fiber for tire cord is treated with a primary treatment liquid composed of a mixture of diisocyanate and epoxy compound blocked with caprolactam, phenol, resorcinol, etc., and RFL A method of secondary treatment with an adhesive liquid has been proposed and used.
U.S. Patent No. 4,446,307 discloses an adhesive treatment method in which an epoxy equivalent of at least 130 is added up to 5 parts by weight to exhibit an adhesive strength. However, this method can exhibit an initial adhesive strength improvement, but epoxy decomposition at a high temperature Or the like may be deteriorated.
U.S. Patent Nos. 6,774,172 B1 and 2007/0243375 A1 disclose a polyethylene terephthalate tire in which a polyethylene terephthalate fiber is first treated with a mixture of epoxy and blocked isocyanate and then subjected to a secondary treatment with an ordinary RFL adhesive solution to improve the adhesive strength However, this method may cause deviation of adhesive force depending on the type and reactivity of epoxy and isocyanate.
U.S. Patent Nos. 3,730,892, 4,054,634 and 4,108,781 synthesize an organofunctionalized silane with an epoxy group and treat it with 0.2-1.5 parts by weight of the polyethylene terephthalate fiber, followed by a secondary treatment with an ordinary RFL adhesive solution However, since the excessive use of epoxy silane results in the stiffness of the final polyethylene terephthalate tire cord being lower than that of the conventional polyethylene terephthalate tire cord, Which may lead to deterioration of workability and fatigue characteristics, and it is disadvantageous that an excessive use of the epoxy silane increases the price of the final product.
In addition, U.S. Patent No. 6,686,301 and International Publication No. WO99 / 046324 disclose the use of a mixture of an amino functionalized silane and an organo-functionalized silane, Although this method also shows an improvement in the initial adhesion, the adhesive strength and fatigue resistance between the polyethylene terephthalate tire cord and the rubber are remarkably reduced due to the aminolysis of the aminosilane at a high temperature It has disadvantages.
The present invention relates to a polyester fiber obtained by treating an adhesive liquid on the surface of a polyester fiber, a process for producing the polyester fiber, and a tire cord comprising the same, wherein reactivity is imparted to the surface of the polyester fiber having no reactivity, , A polyester fiber capable of producing a high performance tire cord capable of reducing the stiffness of a tire cord, improving heat resistance and fatigue resistance, and preventing peeling of rubber and fiber during high-speed traveling of a tire, a method for producing the same, A tire cord is provided.
In order to accomplish the above object, the present invention provides a process for producing a polyurethane foam, comprising the steps of: preparing a primary treatment solution containing blocked diisocyanate and an epoxy compound; Passing the polyester twisted cord through the primary treatment liquid while applying tensile force to the polyester twisted cord; Drying and heat treating the fibers having passed through the primary treatment liquid; Passing the thermally treated polyester fiber through a resorcinol formalin latex (RFL) solution as a secondary treatment solution; And drying and stabilizing the fibers that have passed through the secondary treatment liquid. The present invention also provides a method for producing a polyester fiber.
The blocked diisocyanate and the epoxy compound are preferably used in a weight ratio of 1: 1 to 3: 1.
Also, the dissociation temperature of the blocked diisocyanate is 140 to 180 ° C.
The present invention also provides a polyester tire cord comprising a polyester fiber produced by the above production method.
(1) the initial adhesion strength to rubber measured by H-test is 16kgf or more, the heat-resistant adhesive strength is 10kgf or more, (2) the stiffness measured by the stiffness tester is 4g / cord or less, (3) After the fatigue test as measured using a fatigue tester, the fiber has a strong residual ratio of 80% or more
The polyester fiber according to the present invention can be treated with a mixture of a diisocyanate and an epoxy compound having a lowered dissociation temperature as a primary treatment liquid to exhibit a high heat-resistant adhesive force, rubber coverage and excellent fatigue resistance with low rigidity, This makes it possible to manufacture high-performance tires.
In addition, the diisocyanate used in the present invention is in powder form and has no problem of property change due to long-term storage. Since the dissociation temperature of the blocked diisocyanate is low, the heat treatment temperature can be lowered, It has a high degree of dissociation due to its low content and has the advantage of exhibiting uniform adhesive force.
Hereinafter, the present invention will be described.
The present invention provides a polyester fiber, a method of producing the same, and a tire cord comprising the polyester fiber.
The method for producing a polyester fiber of the present invention comprises the steps of: preparing a primary treatment solution containing blocked diisocyanate and an epoxy compound; Passing the polyester twisted cord through the primary treatment liquid while applying tensile force to the polyester twisted cord; Drying and heat treating the fibers having passed through the primary treatment liquid; Passing the thermally treated polyester fiber through a resorcinol formalin latex (RFL) solution as a secondary treatment solution; And drying and stabilizing the fibers that have passed through the secondary treatment liquid.
The present invention treats a primary treatment solution comprising a diisocyanate and an epoxy compound which lowers the dissociation temperature of the blocked diisocyanate in order to impart reactivity to the polyester fiber and increase the heat-resistant adhesive strength, processability and stiffness. Then, a secondary treatment liquid containing RFL adhesive as a main component is used for adhesion between the polyester fiber and the rubber.
First, 0.5 to 4.0% by weight of blocked diisocyanate, 0.3 to 1.5% by weight of an epoxy compound, 0.5 to 1.5% by weight of vinylpyridine latex, a heat resistant additive 0.3 to 0.6% by weight, and the balance water.
The blocked diisocyanate is diisocyanate (hereinafter referred to as " InstantDip ") manufactured by U.S. Patent Publication No. 2012-0115993, which is a diisocyanate blocked by minimizing the content of caprolactam used for blocking diisocyanate Is lowered by 30 to 40 占 폚.
The blocked diisocyanate comprises from 35 to 95% by weight of partially blocked low molecular weight isocyanate and comprises from 0.1 to 10% by weight of a wetting agent and comprises from 5 to 40% by weight of a binder, up to 5% By weight of a catalyst and 10% by weight or less of an additive.
Also, the dissociation temperature of the blocked diisocyanate is 140 to 180 ° C.
The epoxy compound is not particularly limited as long as it is commonly used in this field, but its content is controlled because the physical properties of the fiber obtained vary depending on the content of the epoxy compound.
Accordingly, the epoxy compound of the present invention is preferably contained in an amount of 0.3 to 1.5% by weight based on 100% by weight of the primary treatment liquid. When the content of the epoxy compound is less than 0.3% by weight, sufficient reactivity is imparted to the fibers and it is difficult to exhibit the adhesive force with the rubber. When the content exceeds 1.5% by weight, the processability is deteriorated due to high rigidity, And the manufacturing cost is also increased.
At this time, the blocked diisocyanate and the epoxy compound are preferably in a weight ratio of 1: 1 to 3: 1. If it is out of the above range, not only a sufficient adhesion force is manifested but also the rigidity is too high, so that the fatigue resistance, which is one of the main required characteristics of the tire cord, is lowered, resulting in a decrease in tire durability.
On the other hand, the diisocyanate and the epoxy compound contained in the primary treatment liquid during the fiber treatment using the primary treatment liquid give a reactivity to the surface of the fiber through chemical reaction during the drying and heat treatment process. The addition of the vinylpyridine latex The compatibility of the diisocyanate and the epoxy compound with the RFL as the secondary treatment liquid can be increased.
The content of the vinylpyridine latex is preferably 0.5 to 1.5% by weight based on 100% by weight of the primary treatment liquid. When the content of the vinylpyridine latex is out of the above range, the reactivity and dispersion stability of the obtained fiber are lowered, And the defects of the final product are increased.
The process of treating the polyester fiber according to the present invention with the primary treatment solution and the RFL will be described as follows.
The polyester fiber produced through the spinning process is twisted and woven, and the heat treatment is performed as follows. The manufactured yarn for a tire cord is twisted in the lower direction in the Z direction and the upper direction in the S direction using a direct twisted yarn, and is weaved using a weaving machine to produce a raw fabric. The thus-produced raw tire for tire cord is treated with the primary treatment liquid during the heat treatment process. Thereafter, the moisture is removed from the drying zone, and the drying temperature is preferably 140 to 180 DEG C, and is dried for 20 to 150 seconds. Then, the blocked diisocyanate is dissociated through heat treatment at 160 to 250 ° C for 20 to 150 seconds to have reactivity, thereby giving reactivity to the fiber surface through chemical reaction with epoxy.
The step of passing the fiber for tire cord, which has been first treated with the diisocyanate and epoxy mixture according to the present invention, through the RFL solution as the secondary treatment liquid and drying and stabilizing the fiber is described as follows. The raw material for the tire cord processed in the primary treatment liquid passes again through the secondary treatment solution containing the RFL adhesive as a main component and the raw tire material for tire code passing through the secondary treatment solution is dried again, And heat treatment is applied to stabilize the surface of the tire cord.
The polyester fiber thus prepared is used as a primary treatment liquid with an epoxy and a diisocyanate (InstantDip) which minimizes the content of the blocking agent and lowers the dissociation temperature of the diisocyanate by 30 ° C or more, A tire cord having high rigidity and high fatigue resistance can be manufactured, and a low content of blocking agent can increase the degree of dissociation of diisocyanate to produce a tire cord having high adhesion properties. In addition, since the heat treatment temperature can be lowered, the manufacturing cost can be reduced.
Hereinafter, the present invention will be described concretely with reference to Examples. However, the following Examples and Experimental Examples are merely illustrative of one form of the present invention, and the scope of the present invention is not limited by the following Examples and Experimental Examples .
Example 1
The primary treatment solution was prepared by adjusting the content of the composition as shown in Table 1 below. The secondary treatment liquid was prepared by ordinary RFL. Polyester fiber for tire cord 1500 denier 2 ply was twisted at 37 ± 2.0 (twist / 10 cm) and 37 ± 2.0 (twist / 10 cm) And dried in a drying zone at 160 캜 for 2 minutes and then heat-treated at 245 캜. The heat-treated polyester fiber was impregnated with RFL adhesive solution, which was a secondary treatment solution, dried at 160 ° C, and stabilized at 245 ° C to produce a polyester tire cord.
Examples 2 to 4, Comparative Examples 1 and 2
A polyester tire cord was prepared in the same manner as in Example 1, except that the content of the primary treatment liquid composition, the drying temperature and the heat treatment temperature were adjusted as shown in Table 1 below.
Heat treatment temperature (캜)
Furtherance
(weight%)
additive
Experimental Example
The properties of the polyester tire cords prepared in Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated by the following methods, and the results are shown in Table 2 below.
(a) Adhesion (kgf) Evaluation method: H-test (H-test)
The cords were vulcanized at 160 ° C for 20 minutes (initial) or 170 ° C for 60 minutes (heat resistance) at a pressure of 50 kgf / cm 2 in a rubber block, The adhesive strength is measured at a tensile speed of 200 m / min using a low elongation tensile tester. The same test was conducted 10 times to obtain an average value. The other method was carried out according to ASTM D4776-98.
(b) Stiffness evaluation method
As a method of representing the rigid characteristics of the heat treatment cords, the cords are taken and attached to a stiffness tester, and the rigidity is measured by measuring the load that the cords are bent by applying a load. The same test was conducted 5 times to obtain an average value.
(c) Evaluation method of fatigue resistance
As a measure showing the resistance value against the external stress of the heat treatment cords, the tire running condition is simulated. In the present invention, the shoe-shine type and the disk type were tested by the endothelium. In case of the shoe shine type, the rubber was topped with a code of 30 EPI (Ends Per Inch) After curing at 160 ° C for 20 minutes, a specimen was prepared. A load of 70 kg was applied to the specimen by a flexural fatigue tester. The specimens were subjected to a repeated load of 50,000 times and then cords were taken therefrom. The tensile strength was measured using a low speed tensile tester Strength is measured at 300 m / min to determine the strong residual ratio against fatigue power. The strength of the cord was measured by taking 10 cords before and after fatigue. The fatigue test was carried out with three endotoxins and the mean value was obtained. The code strength measurement method was carried out in accordance with ASTM D885.
In addition, the evaluation of the in-disk fatigue was carried out using UEShima Seisakusho Co., Ltd. FT-6110. The fatigue test conditions were 6% of tension and 12% of compression. After 8 hours of fatigue at 2500rpm at 120 ℃, the cords were taken and the strength was measured to determine the strong residual strength against fatigue strength. The strength of the cord was measured in the same manner as the shoe fatigue measuring method.
(Pull-out, kgf)
(Pull-out, kgf)
Shoe-shine
Disk
Claims (4)
Passing the polyester twisted cord through the primary treatment liquid while applying tensile force to the polyester twisted cord;
Drying and heat treating the fibers having passed through the primary treatment liquid;
Passing the thermally treated polyester fiber through a resorcinol formalin latex (RFL) solution as a secondary treatment solution; And
Drying and stabilizing the fibers that have passed through the secondary treatment liquid,
The primary treatment liquid preferably contains 0.5 to 4.0% by weight of blocked diisocyanate, 0.3 to 1.5% by weight of epoxy compound, 0.5 to 1.5% by weight of vinylpyridine latex, 0.3 to 0.6% by weight of heat resistant additive % And the remainder comprises water,
The blocked diisocyanate comprises 35 to 95 wt% partially blocked low molecular weight isocyanate, 0.1 to 10 wt% wetting agent, 5 to 40 wt% binder, up to 5 wt% catalyst and up to 10 wt% ≪ / RTI &
Wherein the dissociation temperature of the blocked diisocyanate is 140 to 180 ° C.
(1) the initial adhesion strength to rubber measured by H-test is 16kgf or more, the heat-resistant adhesive strength is 10kgf or more, (2) the stiffness measured by the stiffness tester is 4g / cord or less, (3) After the fatigue test as measured using a fatigue tester, the fiber has a strong residual ratio of 80% or more
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140124291A KR101594150B1 (en) | 2014-09-18 | 2014-09-18 | Polyester fiber, method for preparing the same and tire cord including the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140124291A KR101594150B1 (en) | 2014-09-18 | 2014-09-18 | Polyester fiber, method for preparing the same and tire cord including the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101594150B1 true KR101594150B1 (en) | 2016-02-17 |
Family
ID=55457693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020140124291A KR101594150B1 (en) | 2014-09-18 | 2014-09-18 | Polyester fiber, method for preparing the same and tire cord including the same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101594150B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0811506A (en) * | 1994-06-30 | 1996-01-16 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire and manufacture of belt cord thereof |
| US6774172B1 (en) * | 1998-12-28 | 2004-08-10 | Bridgestone Corporation | Adhesive composition, resin material, rubber article and pneumatic tire |
| JP2009203573A (en) * | 2008-02-27 | 2009-09-10 | Toray Ind Inc | Method for producing polyester fiber cord for reinforcing rubber and rubber hose |
| KR20110073985A (en) * | 2009-12-24 | 2011-06-30 | 주식회사 효성 | Method for producing polyester tire cords |
-
2014
- 2014-09-18 KR KR1020140124291A patent/KR101594150B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0811506A (en) * | 1994-06-30 | 1996-01-16 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire and manufacture of belt cord thereof |
| US6774172B1 (en) * | 1998-12-28 | 2004-08-10 | Bridgestone Corporation | Adhesive composition, resin material, rubber article and pneumatic tire |
| JP2009203573A (en) * | 2008-02-27 | 2009-09-10 | Toray Ind Inc | Method for producing polyester fiber cord for reinforcing rubber and rubber hose |
| KR20110073985A (en) * | 2009-12-24 | 2011-06-30 | 주식회사 효성 | Method for producing polyester tire cords |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101602605B1 (en) | Hybrid Tire Cord and Method for Manufacturing The Same | |
| KR100849087B1 (en) | Cord for reinforcing rubber and preparing method thereof | |
| KR101807613B1 (en) | Polyester fiber, method for preparing the same and tire cord including the same | |
| KR102498390B1 (en) | Cord Comprising Multifilament Para-Aramid Yarn Containing Non-Circular Filaments | |
| JP2006274528A (en) | Polyester tire cap ply cord and method for producing the same | |
| JP4563624B2 (en) | Polyketone twisted cord | |
| KR101594150B1 (en) | Polyester fiber, method for preparing the same and tire cord including the same | |
| KR101594147B1 (en) | Polyester fiber, method for preparing the same and tire cord including the same | |
| KR101602390B1 (en) | Polyester fiber, method for preparing the same and radial tire including the same | |
| JP2006274530A (en) | Polyester fiber material that has improved adhesion with rubber, and method for producing the same | |
| JP3891357B2 (en) | Polyester cord for rubber reinforcement and method for producing the same | |
| JP2007169833A (en) | Polyester tire cap ply cord and method for producing the same | |
| KR20220092849A (en) | Hybrid Tire Cord and Method for Manufacturing The Same | |
| EP3854918B1 (en) | Hybrid tire cord having strong adhesion to rubber and excellent fatigue resistance characteristics, and manufacturing method therefor | |
| KR20120069338A (en) | Method of adhesion for tire cords | |
| JP2006322083A (en) | Method for producing polyester fibrous material for tire cap ply cord | |
| KR20120089898A (en) | Method for producing polyethylene naphthalate tire cords | |
| KR20120073961A (en) | Producing method of aramid filament for rubber reinforcement | |
| KR101705630B1 (en) | A Hybird Dipped cord and Radial tire Using the Same | |
| KR20120073957A (en) | Producing method of hybrid filament for rubber reinforcement | |
| JP7402337B2 (en) | How to process cords for reinforcing layers of pneumatic tires | |
| KR20110073985A (en) | Method for producing polyester tire cords | |
| KR20120071812A (en) | Producing method of polyolefinketone filament for rubber reinforcement | |
| KR101310136B1 (en) | Aramid multi-filament and method of manufacturing | |
| KR20230040167A (en) | Manufacturing method for tire cord having high performance and tire cord produced by the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20190115 Year of fee payment: 4 |