WO2019182539A2 - High performance polyester tire cords - Google Patents

High performance polyester tire cords Download PDF

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Publication number
WO2019182539A2
WO2019182539A2 PCT/TR2018/050741 TR2018050741W WO2019182539A2 WO 2019182539 A2 WO2019182539 A2 WO 2019182539A2 TR 2018050741 W TR2018050741 W TR 2018050741W WO 2019182539 A2 WO2019182539 A2 WO 2019182539A2
Authority
WO
WIPO (PCT)
Prior art keywords
cord
ply
twist
high performance
cords
Prior art date
Application number
PCT/TR2018/050741
Other languages
French (fr)
Other versions
WO2019182539A3 (en
Inventor
Sadettin Fidan
Original Assignee
Kordsa Teknik Tekstil A.S.
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 A.S. filed Critical Kordsa Teknik Tekstil A.S.
Priority to CN201880088923.3A priority Critical patent/CN111670275A/en
Priority to KR1020207018779A priority patent/KR20200088894A/en
Priority to EP18910982.0A priority patent/EP3720998A4/en
Publication of WO2019182539A2 publication Critical patent/WO2019182539A2/en
Publication of WO2019182539A3 publication Critical patent/WO2019182539A3/en

Links

Classifications

    • 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
    • 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
    • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
    • 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
    • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
    • B60C2009/0092—Twist structure
    • 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
    • B60C9/02—Carcasses
    • B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
    • B60C2009/0416—Physical properties or dimensions of the carcass 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
    • B60C9/02—Carcasses
    • B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
    • B60C2009/0416—Physical properties or dimensions of the carcass cords
    • B60C2009/0425—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
    • B60C9/02—Carcasses
    • B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
    • B60C2009/0416—Physical properties or dimensions of the carcass cords
    • B60C2009/0466—Twist structures
    • 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
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D02G3/28—Doubled, plied, or cabled threads
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • the present invention relates to two or three-ply polyester textile (multifil) cords having residual twist in ply yarns in cord which are used as reinforcement in radial passenger and light truck tires.
  • the conventional textile tire reinforcement cords are comprised of pre-twisted yarns (plies) in one direction (Z or S) which are altogether twisted again in opposite direction(cable or cord twist in S or Z direction).
  • those cords have a balanced twisted structure in which yam or ply twists are equal to the cable or cord twist.
  • the residual or resultant yarn twist in cords becomes zero due to untwisting during cord or cable twisting in opposite direction.
  • the zero twisted or untwisted ply yarns in cord have loose parallel filament bundles which have open structure.
  • yams(plies) are twisted lower levels than cord twist (resulting internal cord torques) and alternating S and Z twisted cords in tire cord fabric has been proposed to solve curling or tip rise problems in calendered fabric.
  • yam twist is always less than cord twist and the residual yam(ply) twist is in the same direction with the cord twist leading to high torsional instabilities.
  • yam twist is always higher than cord twist.
  • the high performance(HP) textile cord structures according to invention comprise a sufficient level of residual ply yam twist in opposite direction of cord twist.
  • the ply(yam) twist is higher than that of cord twist but in opposite direction.
  • the major conventional carcass reinforcements in passenger and light truck tires are polyester cords(e.g. PET, PEN).
  • the filament bundles in polyester cord plies are not open (zero twist), but compacted under residual twist and have closed bundle structure.
  • adhesive dip solution(RFL or predip) can not penetrate into the depth of cord plies, but be accumulated on the cord surface, which results in low bending stiffness after drying and heat-setting steps, which is important for improved fatigue resistance and breaking strength retention.
  • the residual twist levels in the plies of the textile cords according to the invention are equal to each other but in opposite direction of cord twist ( Figure- 1 and Figure-2).
  • the plies of the high performance textile cords according to the invention have circular (figure-3, 9 and 10, Figure-5 19, 20 and 21) or oval (12 and 13 in figure- 4, 23, 24 and 25 in figure-6)cross-sections instead of cresent shaped (6 and 7 in figures-3 an4 ) or triangular cross-sections of 2and 3-ply conventional cords.
  • the circumference of the high performance cords are much higher than that of the conventional cords.
  • the high performance cords have much higher contact surface(adhesive interface) with rubber matrix in tire. Such an increase in contact surface enables more efficient stress transfer between cord plies andrubber matrix under dynamic conditions leading to the enhanced tire durability.
  • the plies of the high performance cords with residual twist become more closed and compact during heat- setting process due to their thermal contraction in lateral direction which improves ply stability.
  • Figure- 1 is the comparison of prior art and according to invention S twisted cords, wherein
  • Figure-2 is the comparison of prior art and according to invention Z twisted cords, wherein
  • Cord ply Basic yarn components of a cord
  • Dtex The gram weight of yam having 10,000 meter length.
  • Linear density Weight per unit length as g/dtex or g/d(denier)
  • PET Polyethyleneterephthalate
  • PEN polyethylenenaphthalate
  • Residual twist Resultant twist of the ply yams of a cord (ply twist-cord twist)
  • Total linear density The sum of the nominal linear densities of 5 the ply yarns of the cord
  • Two-ply cord Cord prepared by twisting together two plied yams
  • Three-ply cord Cord prepared by twisting together three plied yams
  • Twist Number of turns per meter (t/m or tpm) The residual twist can be calculated accoring to following formula:
  • the total linear density of the high performance cord according to the invention is greater than l500dtex and less than 8000.
  • the linear densities of the cord plies according to the invention are equal.
  • the maximum linear density difference between the plies of the cord according to the invention is less than 10%.
  • the ply yams in high performance cord according to the invention is PET.
  • the ply yams in high performance cord according to the invention is PEN.
  • the high performance cord according to the invention is used as carcass reinforcement in passenger and light tmck tires.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Tires In General (AREA)

Abstract

The present invention relates to two or three-ply polyester cords having residual twist in ply yarns in cord which are used as carcass reinforcement in passenger and light truck tires.

Description

HIGH PERFORMANCE POLYESTER TIRE CORDS
Field of the invention
The present invention relates to two or three-ply polyester textile (multifil) cords having residual twist in ply yarns in cord which are used as reinforcement in radial passenger and light truck tires.
Background of the invention
The conventional textile tire reinforcement cords are comprised of pre-twisted yarns (plies) in one direction (Z or S) which are altogether twisted again in opposite direction(cable or cord twist in S or Z direction). In general, those cords have a balanced twisted structure in which yam or ply twists are equal to the cable or cord twist.
In such cord structures, the residual or resultant yarn twist in cords becomes zero due to untwisting during cord or cable twisting in opposite direction. The zero twisted or untwisted ply yarns in cord have loose parallel filament bundles which have open structure.
The main advantage of such a cord structure is its simplicity to produce, and its high breaking
Strength (due to parallel filaments in cord plies. The breaking strength advantage is valid only for greige or undipped cord. After dipping process, such cords are subjected to a significant reduction in breaking strength due to adhesive dip penetration between the interstices (void chanels ) of the filament bundles.
According to US 4,877,073, two-ply nylon 6.6 cord in which the first and second plies (yarns)having different twists from each other, has been proposed as low angle overlay (cap ply), which improves uniformity due to ist high initial extensibility (low modulus). Such cords enable high process expansion during moulding and curing without excessive tight cord formation, but their effectiveness to prevent tire growth under high speed conditions is poor because of their low modulus. Additionally, such cords have asymmetric structure causing non-uniform stress distribution(load sharing) between the cord plies and also have tendency to buckle under axial compression leading to early cord breaks.
According to US 6,959,534, in order to reduce twisting costs, yams(plies) are twisted lower levels than cord twist (resulting internal cord torques) and alternating S and Z twisted cords in tire cord fabric has been proposed to solve curling or tip rise problems in calendered fabric. Based on this patent, yam twist is always less than cord twist and the residual yam(ply) twist is in the same direction with the cord twist leading to high torsional instabilities. In the present invention, yam twist is always higher than cord twist.
Summary of the invention The conventional textile cords which are used as tire reinforcement having balanced ply and cord twists with several hundreds of individual parallel filaments have open ply structures in greige form before dipping process.
As explained before, such cords are subjected to the high level of dip(adhesive) penetration into the interstices between the filaments in each ply of the cord even under high cord tensions applied to the cord during dipping in adhesive(RFL or pre-dip) solution .
Two major drawbacks of such highly dip penetrated cord s are their high bending stiffness and reduced breaking strength after dipping and hot stretching process. The cords having higher bending stiffness are subjected to the filament damage under cyclic tension and compression which results in reduced retained strength. On the other hand, less initial cord strength requires higher cord density(epdm) or thicker cords in carcass layer in order to provide sufficient burst strength in tire. Higher cord densty(epdm) means lower cord-to-cord distance(narrow rivet area) in tire, which has high crack initiating potential between the cords due to high shear stresses under dynamic conditions. On the other hand, thicker cords needs higher rubber gauge giving rise to increased rolling resistance in tire.
The high performance(HP) textile cord structures according to invention comprise a sufficient level of residual ply yam twist in opposite direction of cord twist. In other words, in the preparation step, the ply(yam) twist is higher than that of cord twist but in opposite direction. The major conventional carcass reinforcements in passenger and light truck tires are polyester cords(e.g. PET, PEN).
According to invention, the filament bundles in polyester cord plies are not open (zero twist), but compacted under residual twist and have closed bundle structure.
Detailed description of the invention
During dipping process of such greige cords having compact and closed filament bundles as plies in cord, adhesive dip solution(RFL or predip) can not penetrate into the depth of cord plies, but be accumulated on the cord surface, which results in low bending stiffness after drying and heat-setting steps, which is important for improved fatigue resistance and breaking strength retention.
The residual twist levels in the plies of the textile cords according to the invention are equal to each other but in opposite direction of cord twist (Figure- 1 and Figure-2).
The plies of the high performance textile cords according to the invention have circular (figure-3, 9 and 10, Figure-5 19, 20 and 21) or oval (12 and 13 in figure- 4, 23, 24 and 25 in figure-6)cross-sections instead of cresent shaped (6 and 7 in figures-3 an4 ) or triangular cross-sections of 2and 3-ply conventional cords.
As can be seen from the figures-3, 4, 5 and 6, the circumference of the high performance cords are much higher than that of the conventional cords. In other words, compared to the conventional cords having the same total cord dtex and ply number, the high performance cords have much higher contact surface(adhesive interface) with rubber matrix in tire. Such an increase in contact surface enables more efficient stress transfer between cord plies andrubber matrix under dynamic conditions leading to the enhanced tire durability.
The plies of the high performance cords with residual twist, become more closed and compact during heat- setting process due to their thermal contraction in lateral direction which improves ply stability.
The cord structure sand their ply-components according to the invention are illustrated
In the accompanying figures, in which:
Figure- 1 is the comparison of prior art and according to invention S twisted cords, wherein
1- Prior art S-twisted cord(balanced twisted, Z twist of the ply yams are equal to the S twist of the cord)
2- S-twisted cord according to the invention(unbalanced twisted, Z twist of the ply yarns
are greater than the S twist of the cord) with residual Z twist.
Figure-2 is the comparison of prior art and according to invention Z twisted cords, wherein
3- Prior art Z-twisted cord(balanced twisted, S twist of the ply yarns are equal to the Z twist of the cord)
4- Z-twisted cord according to the invention(unbalanced twisted, S twist of the ply yarns
are greater than the Z twist of the cord) with residual S twist.
Figure-3 Cross-sectional views of 2-ply cords, wherein,
5- 2-ply prior art cords with balanced twist having round shape
6- and 7- are cresent-shaped cord plies
8- cross-section view of the 2-ply cord according to the invention
9- and 10- the plies with residual twist having circular cross-sections in cord according to the invention
Figure-4 cross-sectional views of 2-ply cords, wherein, 11- cross-sectional view of the 2-ply cord according to the invention(treated under high tension)
12- and 13- the plies with residual twist having oval cross. sections in cord according to the invention
Figure-5 cross-sectional views of 3-ply cords, wherein;
14- 3 -ply prior art cord with balanced twist with round shape
15, 16 and 17 triangular shaped plies of prior art cord
18. cross-sectional view of the 3-ply cord according to the invention
19, 20, and 21. the plies with residual twist having circular cross-sections in cord according to the invention
Figure-6 cross-sectional views of 3-ply cords, wherein;
22. Is cross-sectional view of the 3-ply cord according to the invention(treated under high tension),
23, 24 and 25 the plies with residual twist having oval cross-sections in cord according to the invention
Definitions
Cord: The reinforcement element formed by twisting together two or more plied yarns
Cord ply: Basic yarn components of a cord
Dtex: The gram weight of yam having 10,000 meter length.
Linear density: Weight per unit length as g/dtex or g/d(denier)
PET : Polyethyleneterephthalate
PEN: polyethylenenaphthalate
Residual twist: Resultant twist of the ply yams of a cord (ply twist-cord twist) Total linear density: The sum of the nominal linear densities of 5 the ply yarns of the cord
Two-ply cord: Cord prepared by twisting together two plied yams
Three-ply cord: Cord prepared by twisting together three plied yams
Twist: Number of turns per meter (t/m or tpm) The residual twist can be calculated accoring to following formula:
Residual twist(tpm)= (ply twist-cord twist) (1)
The total linear density of the high performance cord according to the invention is greater than l500dtex and less than 8000.
The linear densities of the cord plies according to the invention are equal. The maximum linear density difference between the plies of the cord according to the invention is less than 10%.
The ply yams in high performance cord according to the invention is PET.
The ply yams in high performance cord according to the invention is PEN. The high performance cord according to the invention is used as carcass reinforcement in passenger and light tmck tires.

Claims

1. A two or three ply high performance polyester tire cord is characterized in that,
- the residual ply-yarn twists in cord is higher than 30 tpm and less than 120 tpm.
- and cord twist in opposite direction oft he residual twist is higher than 200 tpm and less than 400 tpm.
2. A two or three ply high performance polyester tire cord of claim 1 in which the total nominal linear density of the said cord is higher than 1500 dtex and less than 8000 dtex.
3. A two or three ply high performance polyester tire cord of claim 1 in which the maximum linear density difference between the said ply-yarns is less than 10%.
4. A two or three ply high performance polyester tire cord of claim 1 in which the ply yams in said cord are PET.
5. A two or three ply high performance polyester tire cord of claim 1 in which the ply yams in said cord are PEN.
6. A two or three ply high performance polyester tire cord of claim 1 in which the said cord is used as carcass reinforcement in passenger car tires.
7. A two or three ply high performance polyester tire cord of claim 1 in which the said cord is used as carcass reinforcement in light truck tires.
PCT/TR2018/050741 2017-12-07 2018-11-28 High performance polyester tire cords WO2019182539A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201880088923.3A CN111670275A (en) 2017-12-07 2018-11-28 High performance polyester tire cord
KR1020207018779A KR20200088894A (en) 2017-12-07 2018-11-28 High performance polyester tire cord
EP18910982.0A EP3720998A4 (en) 2017-12-07 2018-11-28 High performance polyester tire cords

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2017/19814A TR201719814A2 (en) 2017-12-07 2017-12-07 HIGH PERFORMANCE POLYESTER TIRE CORD
TR2017/19814 2017-12-07

Publications (2)

Publication Number Publication Date
WO2019182539A2 true WO2019182539A2 (en) 2019-09-26
WO2019182539A3 WO2019182539A3 (en) 2019-12-05

Family

ID=67952425

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2018/050741 WO2019182539A2 (en) 2017-12-07 2018-11-28 High performance polyester tire cords

Country Status (5)

Country Link
EP (1) EP3720998A4 (en)
KR (1) KR20200088894A (en)
CN (1) CN111670275A (en)
TR (1) TR201719814A2 (en)
WO (1) WO2019182539A2 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB526163A (en) * 1938-10-25 1940-09-12 Wingfoot Corp Improvements in and relating to cords for reinforcing tyres, belting, hose and other articles
US3422873A (en) * 1967-07-24 1969-01-21 Firestone Tire & Rubber Co Tire cord
US3603071A (en) * 1970-04-22 1971-09-07 Goodyear Tire & Rubber Cords for annular reinforcing tire belts
US4877073A (en) * 1988-02-17 1989-10-31 The Goodyear Tire & Rubber Company Cables and tires reinforced by said cables
JPH01213489A (en) * 1988-02-19 1989-08-28 Sumitomo Electric Ind Ltd Twisting method of metal wire and device therefor
JP3118152B2 (en) * 1993-11-30 2000-12-18 株式会社ブリヂストン Pneumatic tire
US5855704A (en) * 1996-10-04 1999-01-05 The Goodyear Tire & Rubber Company Pneumatic tire with polyester belt cord
EP1477333B1 (en) * 2002-01-24 2018-06-20 Bridgestone Corporation Pneumatic radial tire
JP2004210194A (en) * 2003-01-07 2004-07-29 Bridgestone Corp Radial tire
US7780560B2 (en) * 2006-10-27 2010-08-24 Veyance Technologies, Inc. Power transmission belt
KR101307440B1 (en) * 2013-01-28 2013-09-12 주식회사 텍스랜드앤넥스코 A method for manufacturing a cord yarn having improved stability
FR3032150A1 (en) * 2015-02-03 2016-08-05 Michelin & Cie RADIAL TIRE HAVING IMPROVED BELT STRUCTURE

Also Published As

Publication number Publication date
KR20200088894A (en) 2020-07-23
TR201719814A2 (en) 2019-06-21
EP3720998A4 (en) 2021-09-01
CN111670275A (en) 2020-09-15
WO2019182539A3 (en) 2019-12-05
EP3720998A2 (en) 2020-10-14

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