WO2018124985A1 - Câble de nappe sommet en polyester - Google Patents

Câble de nappe sommet en polyester Download PDF

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Publication number
WO2018124985A1
WO2018124985A1 PCT/TR2016/050552 TR2016050552W WO2018124985A1 WO 2018124985 A1 WO2018124985 A1 WO 2018124985A1 TR 2016050552 W TR2016050552 W TR 2016050552W WO 2018124985 A1 WO2018124985 A1 WO 2018124985A1
Authority
WO
WIPO (PCT)
Prior art keywords
cord
polyester
cap ply
ply cord
ply
Prior art date
Application number
PCT/TR2016/050552
Other languages
English (en)
Inventor
Mehmet Sadettin Fidan
Original Assignee
Kordsa Teknik Tekstil Anonim Sirketi
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 Anonim Sirketi filed Critical Kordsa Teknik Tekstil Anonim Sirketi
Priority to PCT/TR2016/050552 priority Critical patent/WO2018124985A1/fr
Priority to EP16836128.5A priority patent/EP3512719A1/fr
Publication of WO2018124985A1 publication Critical patent/WO2018124985A1/fr

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
    • B60C9/2204—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 obtained by circumferentially narrow strip winding
    • 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
    • B60C2009/2074—Physical properties or dimension of the belt cord
    • B60C2009/208—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
    • B60C2009/2257—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
    • B60C2009/2276—Tensile strength
    • 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 which has different tensile and thermal properties at top and bottom side of 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 circumferentially 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 bi-elastic 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.
  • 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 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 different tensile and thermal properties at top and bottom side of the cord.
  • Such cords show bi-elastic tensile properties, because each ply within this cord comprises alternately high and low modulus parts.
  • the production principle of the transformation of more or less linear tensile behaviour of the polyester cord to bi-elastic characteristic is based on the thermal relaxation of one side of the pre-stretched polyester cord along its axis. That means, the polyester cord according to the invention comprises high modulus top side and low modulus bottom side (or vice versa) along its axis.
  • Each of the single plies of such a polyester cord contains intermittent zones (parts) having high and low modulus with bi-elastic tensile behaviour.
  • Cord ply Plied single yarns within cord.
  • Dtex The gramm weight of yarn having lO.OOOmeter 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) BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure- 1 is a lateral view of conventional (prior art) two ply polyester cords and its individual plies in which,
  • Figure-2 is a lateral view of a two-ply polyester cord under tension during heat- setting process (prior art process)
  • Figure-3 is a lateral view of a pre-stretched two-ply polyester cord under tension during heat- setting process according to invention
  • Figure-4 is a lateral view of partially relaxed two-ply polyester cord
  • 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 current tire process technology for radial passenger, SUV and light truck tires requires bi-elastic cap ply for zero degree belt reinforcement applications.
  • 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 conventional polyester cords are uniformly heat-set in high temperature ovens having constant temperature along the oven (Tl) under a given tension (F) ( Figure 1 and 2).
  • Such cords have uniform and constant physical properties in radial and axial directions.
  • two or more ply polyester cords without any low modulus component ply like nylon can be produced with bi-elastic tensile properties.
  • Such a novel bi-elastic polyester cords can be used 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 bi-elastic polyester cord is to relax one side (e.g. bottom side) of the cord at high temperature while maintaining the original high modulus at another side (e.g. top side).
  • 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 (Figure- 3)
  • a polyester cord having relaxed side means, the individual cord plies comprise high and low modulus parts (zones) as repeated units alternately along its length axis.
  • Such a cord elongates initially more than the original non-relaxed high modulus cord upon subjecting to a load. That means it has bi-elastic tensile behaviour.
  • the already hot-stretched (pre- hot stretched) polyester cord is exposed to high temperature from the bottom side under a tension which is lower than the thermal shrink force at that temperature which leads to partial relaxation at the bottom side of the polyester cord.
  • each of the cords plies are relaxed (lowered modulus) at the bottom side, while maintaining non-relaxed state (high modulus) at the top side.
  • the polyester cord comprising plies with high and low modulus parts shows bi-elastic tensile behaviour which is required for cap ply applications ( Figure-4 and 5)
  • the tensile bielasticity characteristic of the polyester cord can be changed with the degree of relaxation.
  • the 3% TASE value is measured in accordance with ASTM D885-16 and this value for the polyester cord according to the invention is less than 1.5cN/dtex.
  • 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.
  • the total nominal cord linear density is higher than 3000dtex and less than 8,000 dtex.
  • the cords having less than 3000 dtex can not be partially relaxed and the cords having higher than 8,000 dtex are too thick.
  • the preferable polyester polymer types are polyethylene terephthalate and polyethylene naphthlate.

Abstract

La présente invention concerne un câble à pneus en polyester qui présente des propriétés de traction et thermiques différentes sur le côté supérieur et le côté inférieur du câble. Ledit câble à pneus en polyester bi-élastique améliore l'aptitude au traitement, la durabilité à grande vitesse, élimine l'aplanissement et permet des accrochages élevés pendant des processus de construction et de durcissement de pneu lorsqu'il est utilisé en tant que bandelette talon sommet à degré zéro enroulée en spirale dans des pneus radiaux.
PCT/TR2016/050552 2016-12-28 2016-12-28 Câble de nappe sommet en polyester WO2018124985A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/TR2016/050552 WO2018124985A1 (fr) 2016-12-28 2016-12-28 Câble de nappe sommet en polyester
EP16836128.5A EP3512719A1 (fr) 2016-12-28 2016-12-28 Câble de nappe sommet en polyester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2016/050552 WO2018124985A1 (fr) 2016-12-28 2016-12-28 Câble de nappe sommet en polyester

Publications (1)

Publication Number Publication Date
WO2018124985A1 true WO2018124985A1 (fr) 2018-07-05

Family

ID=58016770

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2016/050552 WO2018124985A1 (fr) 2016-12-28 2016-12-28 Câble de nappe sommet en polyester

Country Status (2)

Country Link
EP (1) EP3512719A1 (fr)
WO (1) WO2018124985A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
WO2015097655A2 (fr) * 2013-12-25 2015-07-02 Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Pneu radial
WO2015137901A1 (fr) * 2014-03-12 2015-09-17 Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Pneu radial a bandage pneumatique a renfort de câbles hybrides

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
WO2015097655A2 (fr) * 2013-12-25 2015-07-02 Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Pneu radial
WO2015137901A1 (fr) * 2014-03-12 2015-09-17 Kordsa Global Endustriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Pneu radial a bandage pneumatique a renfort de câbles hybrides

Also Published As

Publication number Publication date
EP3512719A1 (fr) 2019-07-24

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