WO2018124982A1 - Bi-elastic polyester cap ply cord - Google Patents
Bi-elastic polyester cap ply cord Download PDFInfo
- Publication number
- WO2018124982A1 WO2018124982A1 PCT/TR2016/050546 TR2016050546W WO2018124982A1 WO 2018124982 A1 WO2018124982 A1 WO 2018124982A1 TR 2016050546 W TR2016050546 W TR 2016050546W WO 2018124982 A1 WO2018124982 A1 WO 2018124982A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cap ply
- ply cord
- polyester
- cord
- tase
- Prior art date
Links
- 229920000728 polyester Polymers 0.000 title claims abstract description 43
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 10
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 10
- -1 polyethylene terephthalate Polymers 0.000 claims description 6
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims 1
- 239000011112 polyethylene naphthalate Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 239000004677 Nylon Substances 0.000 description 15
- 229920001778 nylon Polymers 0.000 description 15
- 239000004760 aramid Substances 0.000 description 7
- 229920003235 aromatic polyamide Polymers 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0042—Reinforcements made of synthetic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2257—Diameters of the cords; Linear density thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2261—Modulus of the cords
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2285—Twist structures
Definitions
- the length of high 3% TASE zone is at least 5 and maximum 20 mm, and the length of low 3% TASE zone is also at least 5 and maximum 20 mm.
- the lengths of high and low TASE zones can be equal or different.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The present invention relates to a novel polyester tire cord reinforcement which has intermittently different tensile properties at its different parts along the cord. Such a novel bi-elastic polyester tire cord improves processability, high speed durability, eliminates flatspotting and enables high liftings during tire building and curing processes when used as spirally wound zero degree cap strip in pneumatic radial tires.
Description
BI-ELASTIC POLYESTER CAP PLY CORD
FIELD OF THE INVENTION
The present invention relates to a novel polyester tire cord reinforcement which has different tensile and thermal properties intermittently at its different parts along the cord. Such a novel bi-elastic polyester tire cord improves processability, high speed durability, eliminates flatspotting and enables high liftings during tire building and curing processes when used as spirally wound zero degree cap strip in pneumatic radial tires.
DESCRIPTION OF THE RELATED ART
Under high speed conditions, the outer diameter of the tire increases due to centrifugal forces generated by steel cord belt package and tread. Such a diameter increase or tire growth increases the pantographic movements of the belt edge cords leading to the crack initiations, crack propagations and at the end belt edge separations.
The cap ply layer which is spirally wound on belt package prevents excessive tire growth under high speed conditions by applying compressive forces (restraining force) on heavy belt package made of cross ply steel cord layers.
Currently, most widely used cap ply materials are nylon 6.6 and hybrid cords which are spirally wound on belt package at 0 to 5 degrees to equatorial plane of the tire. In addition to nylon 6.6 and aramid/nylon 6.6 hybrid cords, there are also some polyester (polyethylene terephthalate, PET) applications as cap ply. But due to high initial modulus of PET, there is a risk of tight cord formation after lifting which means contact with steel cords of the top belt layer leading to cord breaks under dynamic conditions.
Nylon cords have excellent fatigue resistance under bending and axial compression, and bielastic tensile characteristic enabling easy processing during tire building. Additionally, shrink force generation with increasing service temperature under high speed conditions improves belt edge separation resistance and high speed durability. But low glass transition temperature of nylon causes flatspot problems in tire during parking after high speed driving. Other potential drawback of multilayer nylon cap ply assembly is its high rubber gauge which cause to increase the rolling resistance of the tire by hysteresis (heat build up).
As mentioned above, the hybrid cords comprising high and low modulus yarns having bi-elastic tensile behaviour are also used as cap ply in high speed tires. The
low modulus component of hybrid cord enables easy belt package lifting without tight cord formation due to its high extensibility and the high modulus component becomes effective in service conditions. By using hybrid cords as cap ply, the total thickness of the cap ply layer and rubber content can be reduced, and the high modulus component of the hybrid cord enhances the restraining force and improves the high speed durability. But existence of nylon causes also some flatspot. As cap ply, hybrid cord containing aramid is an expensive solution.
On the other hand, cap ply cords made of ultra high modulus yarns having high twist have been also used as tire reinforcement to eliminate flatspot and improve high speed performance, but high level of cord twist results in drastic modulus and breaking strength (tenacity) losses.
US Patent No. 6,799,618 describes a textile cap ply structure which is superimposed radially outwardly to the belt assembly is reinforced with cords being made of materials including nylon and aramid. At initial elongation of the cords, the primary load bearing yarns are nylon yarns, and after appreciable elongation the primary load bearing yarns are the aramid yarns.
US Patent No. 7,584,774 describes a belt reinforcing layer (cap ply) disposed outside the belt in the radial direction, characterized in that the belt reinforcing layer is formed by continuously and spirally winding a polyethylene terephthalate (PET) cord in a circumferential direction of the tire, and this cord has an elastic modulus of not less than 2.5mN/dtex.% under a load of 29.4N measured at 160°C. Due to high initial modulus of the PET cord, lifting must be less than 2% in this applications to prevent excessive tight cord formations.
US Patent No. 2013/0025758 describes a high performance pneumatic radial tire for passenger cars which uses a hybrid cord composed of two ply aramid yarn and single ply nylon yarn having different twist counts for the first twist and different twist counts for the second twist, as a cap ply, and thereby has improved high speed durability and steering stability.
SUMMARY OF THE INVENTION
The invention provides a two or more ply polyester cord reinforcement having bi- elastic tensile properties. Namely, low initial modulus and high modulus after initial elongation. In order to prevent modulus and breaking strength loss, high level of cord twisting has been avoided.
The production principle of the transformation of more or less linear tensile behaviour of the polyester cord to bielastic characteristic (initial modulus reduction and enhancing initial extensibility with low forces) is based on the intermittent
thermal relaxation of the polyester cord along its axis. That means, the polyester cord according to the invention comprises high and low modulus parts alternately along its axis. Such a polyester cord containing intermittent zones (parts) with two different properties shows bi-elastic behaviour.
Definitions:
Cord: The product formed by twisting together two or more plied yarns
Cord ply: Plied single yarns within cord.
Dtex: The gram weight of yarn having 10.000 meter length.
Flatspotting: Cords in tire having low Tg and high thermal shrikforce is subjected to shrinkage at footprint. When cooled in this position, the cord maintains flatspot until it again reaches its Tg in use.
Greige cord: Twisted cord before dipping and heat- setting
Heat-setting: The process of conferring dimensional stability and heat resistance to the
yarns, cords or fabrics by means of either moist or heat.
Heat-set cord: Cord exposed to high temperature (e.g. 120°C to 260°C under tension)
Linear density: Weight per unit length as g/dtex or g/d(denier)
TASE at 3% elongation: Stress at 3% elongation as cN/dtex
Tenacity: Breaking force(N) divided by linear density(dtex)
Tg: Glass transition point of polymer
Thermal relaxation: Thermal shrinkage causing modulus reduction
Total nominal cord dtex: Sum of nominal yarn linear densities (3340 dtex for 1670x2 cord)
Twist: Number of turns about its axis per meter of a yarn or cord (t/m or tpm)
BRIEF DESCRIPTION OF THE DRAWINGS
Figure- 1 is a lateral view of conventional (prior art) two ply polyester cords in which,
1- Lateral view of the conventional polyester cord
2- Constant TASE(modulus) zone(all conventional cords have uniform and constant distribution of physical properties over the length)
Figure-2 is a lateral view of a two-ply cord according to invention in which,
3- Lateral view of the polyester cord according to invention
4- High TASE(high modulus) zone
5- Low TASE(low modulus) relaxed zone
DETAILED DESCRIPTION OF THE INVENTION
PET with its high modulus and low thermal shrinkage is a dimensionally stable material. In twisted form as two or three-ply cord, it can be used as carcass and cap ply reinforcement in radial passenger and light truck tires.
The cord twisting improves bending and compression fatigue resistance of the PET, but at the same time reduces the modulus and strength too.
Current tire process technology for radial passenger, SUV and light truck tires requires bi-elastic cap ply for zero degree belt reinforcement applications.
In zero degree cap ply applications in pneumatic radial tires, the high modulus is needed for restraining force to prevent belt edge separations under high speed conditions, but initial extensibility with low forces (initial low modulus) is also needed for processability during lifting of belt package in tire building and curing processes to avoid cord cuttings through the belt skim compound.
Nylon and aramid/nylon hybrid cords fulfill bi-elasticity requirement which is needed due to high lifting ratios during tire building process.
As well known aramid/nylon hybrid cords are expensive and their transition points from low modulus to high modulus should conform with lifting process parameters. Otherwise the hybrid cords may cause tight or loose cords in cap ply.
Two or three-ply nylon 6.6 cords are well known reinforcements as cap ply in radial passenger car and light truck tires, but flatspot and low level of modulus are their major drawbacks.
The PET and all other polymeric cords which are used as tire reinforcement have a given physical properties along the cord. Namely, those cords have uniform and constant property distribution along its length (Figure- 1).
According to the present invention, two or more ply polyester cords without any low modulus component ply like nylon, can be produced with bielastic tensile
properties. Such a novel bi-elastic polyester cords can be used as as zero degree cap ply in radial tires to improve high speed durability and do not show any significant flatspotting.
According to invention, the basic production principle of the bielastic polyester cord is to relax the intermittent parts of the cord at high temperature while maintaining the original high modulus of some other parts (Figure-2). The relaxed parts of the polyester cord become more extensible under a given force, and the rest of the cord maintaining the original high modulus keeps its low extensibility.
According to invention, , such a cord comprising alternately repeated low and high modulus zones along its length (axis), elongates initially more than the original non- relaxed high modulus cord upon subjecting to a load.
In order to obtain a bielastic tensile characteristics, the already hot-stretched (pre- hot stretched) polyester cord is exposed to high temperature intermittently under a tension which is lower than the thermal shrinkforce at that temperature which leads to partial relaxation at the zones exposed to high temperature.
The tensile bi-elasticity characteristic of the polyester cord can be changed with the degree of relaxation and the percentage of the relaxed part (length) compared to the non-relaxed part.
The 3% TASE values are measured in accordance with ASTM D885-16 and this value for high modulus zone is higher than 2.0cN/dtex.
The ratio of high 3% LASE/low 3% LASE is less than 0.70 and higher than 0.30. If this ratio is higher than 0.70, sufficient bi-elasticity can not be obtained and processability during tire building and curing becomes difficult. If this ratio is lower than 0.30, very high relaxations might be necessary which may lead to cord strength loss (tenacity drop).
According to invention, the number of high 3% TASE parts is at least 25 and maximum lOOzones/meter cord, and the number of low 3% TASE parts is also at least 25 and maximum lOOzones/meter cord.
According to invention, the length of high 3% TASE zone is at least 5 and maximum 20 mm, and the length of low 3% TASE zone is also at least 5 and maximum 20 mm. The lengths of high and low TASE zones can be equal or different.
According to invention, the twist factor of the cord is higher than 10,000 and less than 20,000 which is determined based on the following formula;
Twist factor = cord twist(tpm)x square root of total nominal cord dtex (1)
The cords with lower than 10,000 twist factor have insufficient fatigue resistance under bending and the cords with higher than 20,000 twist factor have significant modulus reductions.
According to invention, the total nominal cord linear density is higher than 500 dtex and less than 8,000 dtex.
The cords having less than 500 dtex are not effective enough, and the cords having higher than 8,000 dtex are too thick.
The preferable polyester polymer types are polyethylene terephthlate and polyethylene naphthlate.
Claims
1. At least two ply dipped and heat-set polyester cap ply cord which is spirally wound on the top belt layer of a radial pneumatic tire is characterized in that,
said cap ply cord has intermittent parts with different 3% TASE values,
- the higher 3% TASE value is higher than 2.0 cN/dtex
- the ratio of lower 3% TASE/higher 3% TASE is less than 0.70 and higher than 0.30.
2. A polyester cap ply cord according to claim 1 which is characterized in that the number of lower 3% TASE parts of the said polyester cap ply cord is at least 25 zones /meter and maximum 100 zones/meter.
3. A polyester cap ply cord according to claim 1 which is characterized in that the number of higher 3% TASE parts of the said polyester cap ply cord is at least 25 zones/meter and maximum 100 zones/meter.
4. A polyester cap ply cord according to claim 1 which is characterized in that the length of higher 3% TASE zone of the said polyester cap ply cord is at least 5 and maximum 20 mm.
5. A polyester cap ply cord according to claim 1 which is characterized in that the length of lower 3% TASE zone of the said polyester cap ply cord is at least 5 and maximum 20 mm.
6. A polyester cap ply cord according to claim 1 which is characterized in that the lengths of high and low 3% TASE zones of the said polyester cap ply cord are equal to each other.
7. A polyester cap ply cord according to claim 1 which is characterized in that the lengths of high and low 3% TASE zones of the said polyester cap ply cord have different values than each other.
8. A polyester cap ply cord according to claim 1 which is characterized in that twist factor of the said polyester cap ply cord is higher than 10,000 and lower than 20,000 which is calculated according to the following formula;
Twist factor = cord twist(tpm)x square root of total nominal cord dtex
9. A polyester cap ply cord according to claim 1 which is characterized in that total nominal linear density of the said polyester cap ply cord is higher than 500 dtex and lower than 8,000 dtex.
10. A polyester cap ply cord according to claim 1 which is characterized in that the said polyester is polyethylene terephthalate.
11. A polyester cap ply cord according to claim 1 which is characterized in that the said polyester is polyethylene naphthalate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/TR2016/050546 WO2018124982A1 (en) | 2016-12-28 | 2016-12-28 | Bi-elastic polyester cap ply cord |
| EP16836127.7A EP3509873A1 (en) | 2016-12-28 | 2016-12-28 | Bi-elastic polyester cap ply cord |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/TR2016/050546 WO2018124982A1 (en) | 2016-12-28 | 2016-12-28 | Bi-elastic polyester cap ply cord |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018124982A1 true WO2018124982A1 (en) | 2018-07-05 |
Family
ID=58016769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2016/050546 WO2018124982A1 (en) | 2016-12-28 | 2016-12-28 | Bi-elastic polyester cap ply cord |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3509873A1 (en) |
| WO (1) | WO2018124982A1 (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423213A1 (en) * | 1988-07-05 | 1991-04-24 | Allied Signal Inc | Dimensionally stable polyester yarn for high tenacity treated cords. |
| US6799618B2 (en) | 2002-12-18 | 2004-10-05 | The Goodyear Tire & Rubber Company | Pneumatic tire having an overlay reinforcement |
| US20070243375A1 (en) * | 2004-05-18 | 2007-10-18 | Toyo Boseki Kabushiki Kaisha | Polyester Cord for Reinforcement of Rubber and a Method for Producing the Same |
| US7584774B2 (en) | 2003-10-06 | 2009-09-08 | Bridgestone Corporation | Pneumatic radial tire with polyethylene terephthalate cord belt reinforcing layer |
| DE102009003359A1 (en) * | 2009-01-19 | 2010-07-22 | Continental Reifen Deutschland Gmbh | Cord for use as reinforcement in belt bandage of vehicle pneumatic tire, has yarn made of filaments with polyester and non-pre-shrinkable materials, where cord is subjected to relaxation process after rotating yarns with each other |
| US20130025758A1 (en) | 2011-07-25 | 2013-01-31 | Hankook Tire Co., Ltd. | Hybrid cord composed of aramid cord and nylon 66 cord, and pneumatic tire using the same as reinforcing cord |
| WO2014102672A1 (en) * | 2012-12-25 | 2014-07-03 | Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi | A tire reinforcement material |
| WO2015097655A2 (en) * | 2013-12-25 | 2015-07-02 | Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi | Pneumatic radial tire |
| US20160288577A1 (en) * | 2013-11-19 | 2016-10-06 | Continental Reifen Deutschland Gmbh | Hybrid reinforcement |
-
2016
- 2016-12-28 WO PCT/TR2016/050546 patent/WO2018124982A1/en unknown
- 2016-12-28 EP EP16836127.7A patent/EP3509873A1/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423213A1 (en) * | 1988-07-05 | 1991-04-24 | Allied Signal Inc | Dimensionally stable polyester yarn for high tenacity treated cords. |
| US6799618B2 (en) | 2002-12-18 | 2004-10-05 | The Goodyear Tire & Rubber Company | Pneumatic tire having an overlay reinforcement |
| US7584774B2 (en) | 2003-10-06 | 2009-09-08 | Bridgestone Corporation | Pneumatic radial tire with polyethylene terephthalate cord belt reinforcing layer |
| US20070243375A1 (en) * | 2004-05-18 | 2007-10-18 | Toyo Boseki Kabushiki Kaisha | Polyester Cord for Reinforcement of Rubber and a Method for Producing the Same |
| DE102009003359A1 (en) * | 2009-01-19 | 2010-07-22 | Continental Reifen Deutschland Gmbh | Cord for use as reinforcement in belt bandage of vehicle pneumatic tire, has yarn made of filaments with polyester and non-pre-shrinkable materials, where cord is subjected to relaxation process after rotating yarns with each other |
| US20130025758A1 (en) | 2011-07-25 | 2013-01-31 | Hankook Tire Co., Ltd. | Hybrid cord composed of aramid cord and nylon 66 cord, and pneumatic tire using the same as reinforcing cord |
| WO2014102672A1 (en) * | 2012-12-25 | 2014-07-03 | Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi | A tire reinforcement material |
| US20160288577A1 (en) * | 2013-11-19 | 2016-10-06 | Continental Reifen Deutschland Gmbh | Hybrid reinforcement |
| WO2015097655A2 (en) * | 2013-12-25 | 2015-07-02 | Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi | Pneumatic radial tire |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3509873A1 (en) | 2019-07-17 |
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