EP3509873A1 - Fil câblé de nappe sommet en polyester bi-élastique - Google Patents

Fil câblé de nappe sommet en polyester bi-élastique

Info

Publication number
EP3509873A1
EP3509873A1 EP16836127.7A EP16836127A EP3509873A1 EP 3509873 A1 EP3509873 A1 EP 3509873A1 EP 16836127 A EP16836127 A EP 16836127A EP 3509873 A1 EP3509873 A1 EP 3509873A1
Authority
EP
European Patent Office
Prior art keywords
cap ply
ply cord
polyester
cord
tase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16836127.7A
Other languages
German (de)
English (en)
Inventor
Mehmet Sadettin Fidan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kordsa Teknik Tekstil AS
Original Assignee
Kordsa Teknik Tekstil AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kordsa Teknik Tekstil AS filed Critical Kordsa Teknik Tekstil AS
Publication of EP3509873A1 publication Critical patent/EP3509873A1/fr
Withdrawn legal-status Critical Current

Links

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 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.
  • 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.
  • 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.
  • 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.
  • nylon 6.6 and aramid/nylon 6.6 hybrid cords there are also some polyester (polyethylene terephthalate, PET) applications as cap ply.
  • PET polyethylene terephthalate
  • 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).
  • 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.
  • hybrid cords 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.
  • 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.
  • cords being made of materials including nylon and aramid.
  • 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.
  • PET polyethylene terephthalate
  • 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.
  • 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 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.
  • Cord ply Plied single yarns within cord.
  • Dtex The gram weight of yarn having 10.000 meter length.
  • Greige cord Twisted cord before dipping and heat- setting
  • Heat-setting The process of conferring dimensional stability and heat resistance to the
  • 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)
  • 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)
  • Figure- 1 is a lateral view of conventional (prior art) two ply polyester cords in which, 1- Lateral view of the conventional polyester cord
  • Figure-2 is a lateral view of a two-ply cord according to invention in which,
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente invention concerne un nouveau renfort de fil câblé de pneu en polyester qui a des propriétés de traction différentes par intermittence au niveau de ses différentes parties le long du câble. Un tel nouveau fil câblé de pneu en polyester bi-élastique améliore l'aptitude au traitement, la durabilité à grande vitesse, supprime l'aplanissement et permet des accrochages élevés pendant des processus de construction et de cuisson de pneu lorsqu'il est utilisé en tant que nappe sommet à degré zéro enroulée en spirale dans des pneus radiaux.
EP16836127.7A 2016-12-28 2016-12-28 Fil câblé de nappe sommet en polyester bi-élastique Withdrawn EP3509873A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2016/050546 WO2018124982A1 (fr) 2016-12-28 2016-12-28 Fil câblé de nappe sommet en polyester bi-élastique

Publications (1)

Publication Number Publication Date
EP3509873A1 true EP3509873A1 (fr) 2019-07-17

Family

ID=58016769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16836127.7A Withdrawn EP3509873A1 (fr) 2016-12-28 2016-12-28 Fil câblé de nappe sommet en polyester bi-élastique

Country Status (2)

Country Link
EP (1) EP3509873A1 (fr)
WO (1) WO2018124982A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU634484B2 (en) * 1988-07-05 1993-02-25 Performance Fibers, 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
JP4397207B2 (ja) 2003-10-06 2010-01-13 株式会社ブリヂストン 空気入りラジアルタイヤ
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 (de) * 2009-01-19 2010-07-22 Continental Reifen Deutschland Gmbh Kord zur Verwendung als Festigkeitsträger in einer Gürtelbandage eines Fahrzeugluftreifens
KR101260390B1 (ko) 2011-07-25 2013-05-21 한국타이어 주식회사 아라미드 코드와 나일론 66과의 하이브리드 코드 및 이를 보강 코드로 사용하는 공기입 타이어
KR101859075B1 (ko) * 2012-12-25 2018-06-28 코드사 테크닉 테크스틸 아노님 시르케티 타이어 강화 물질
DE102013223573A1 (de) * 2013-11-19 2015-05-21 Continental Reifen Deutschland Gmbh Dünner Hybridfestigkeitsträger für elastomere Erzeugnisse, insbesondere für die Gürtelbandage eines Fahrzeugluftreifens, sowie Verfahren zur Herstellung
TR201606722T1 (tr) * 2013-12-25 2016-11-21 Kordsa Teknik Tekstil As Pnömati̇k radyal lasti̇k

Also Published As

Publication number Publication date
WO2018124982A1 (fr) 2018-07-05

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