EP3720999A2 - High performance nylon tire cords - Google Patents

High performance nylon tire cords

Info

Publication number
EP3720999A2
EP3720999A2 EP18915257.2A EP18915257A EP3720999A2 EP 3720999 A2 EP3720999 A2 EP 3720999A2 EP 18915257 A EP18915257 A EP 18915257A EP 3720999 A2 EP3720999 A2 EP 3720999A2
Authority
EP
European Patent Office
Prior art keywords
cord
ply
twist
high performance
cords
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Withdrawn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
EP18915257.2A
Other languages
German (de)
French (fr)
Other versions
EP3720999A4 (en
Inventor
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 EP3720999A2 publication Critical patent/EP3720999A2/en
Publication of EP3720999A4 publication Critical patent/EP3720999A4/en
Withdrawn legal-status Critical Current

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
    • B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite 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
    • 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
    • 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
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/02—Tyres specially adapted for particular applications for aircrafts
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/14—Tyres specially adapted for particular applications for off-road use
    • 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
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides

Definitions

  • the present invention relates to two or three-ply nylon textile (multifil) cords having residual twist in ply yarns in cord which are used as reinforcement in bias and radial aircraft and off the road tires.
  • the conventional textile tire reinforcement cords are comprised of pre-twisted yarns(plies) in
  • yarn 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.
  • 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 cords. After dipping process, such cords are subjected to a significant reduction in breaking strength due to adhesive dip penetration between the interstices(void channels ) of the filament bundles.
  • 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
  • SUBSTITUTE SHEETS (RULE 26) 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.
  • yarn twist is always higher than cord twist.
  • the high performance (HP) textile cord structures according to invention comprise a sufficient level of residual ply yarn twist in opposite direction of cord twist.
  • the ply (yarn) twist is always higher than that of cord twist but in opposite direction.
  • the major carcass reinforcements in aircraft and off the road tires are nylon cords (e.g. nylon 6 and nylon 6.6 ).
  • the filament bundles in such nylon cord plies are not open(zero twist), but compacted under residual twist and have closed bundle structures.
  • adhesive dip solution(RFL) 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 maximum residual twist difference between the cord plies is less than 15%.
  • 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
  • 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.
  • cord structures and their ply-components according to the invention are illustrated.
  • 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)
  • Nylon 6.6 Polyhexamethylene adipamide
  • Nylon 6 Polycaprolactam
  • Nylon 4.6 polytetramethylene adipamide
  • 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
  • the residual twist and twist multiplier can be calculated accoring to following formulas:
  • the total linear density of the high performance cord according to the invention is greater than 2500 dtex and less than 9000 dtex in opposite direction of the cord twist direction.
  • 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 comprising of nylon 6.6, nylon 6, nylon 4.6 or mixtures thereof.
  • the high performance cord according to the invention is used as carcass reinforcement in radial and bias aircraft and off the road tires.

Landscapes

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

Abstract

The present invention relates to two or three-ply nylon textile (multifil) cords having residual twist in ply yarns in cord which are used as reinforcement in bias and radial aircraft and off the road tires.

Description

HIGH PERFORMANCE NYLON TIRE CORDS
Field of the invention
The present invention relates to two or three-ply nylon textile (multifil) cords having residual twist in ply yarns in cord which are used as reinforcement in bias and radial aircraft and off the road 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
yarn 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 cords. After dipping process, such cords are subjected to a significant reduction in breaking strength due to adhesive dip penetration between the interstices(void channels ) 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
1
SUBSTITUTE SHEETS (RULE 26) 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 yarn(ply) twist is in the same direction with the cord twist leading to high torsional instabilities.
In our invention, yarn 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) dip solution .
Two major drawbacks of such highly dip penetrated cords 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
2
SUBSTITUTE SHEETS (RULE 26) 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 yarn twist in opposite direction of cord twist. In other words, in the preparation step, the ply (yarn) twist is always higher than that of cord twist but in opposite direction. The major carcass reinforcements in aircraft and off the road tires are nylon cords (e.g. nylon 6 and nylon 6.6 ).
According to invention, the filament bundles in such nylon cord plies are not open(zero twist), but compacted under residual twist and have closed bundle structures.
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) 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 maximum residual twist difference between the cord plies is less than 15%. 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
3
SUBSTITUTE SHEETS (RULE 26) 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 structures and 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,
4
SUBSTITUTE SHEETS (RULE 26) 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)
Nylon 6.6: Polyhexamethylene adipamide
Nylon 6: Polycaprolactam
Nylon 4.6: polytetramethylene adipamide
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
5
SUBSTITUTE SHEETS (RULE 26) Twist: Number of turns per meter (t/m or tpm)
The residual twist and twist multiplier can be calculated accoring to following formulas:
Residual twist(tpm)= (ply twist-cord twist) (1)
The total linear density of the high performance cord according to the invention is greater than 2500 dtex and less than 9000 dtex in opposite direction of the cord twist direction.
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 comprising of nylon 6.6, nylon 6, nylon 4.6 or mixtures thereof.
The high performance cord according to the invention is used as carcass reinforcement in radial and bias aircraft and off the road tires.
6
SUBSTITUTE SHEETS (RULE 26)

Claims

1. A two or three ply high performance nylon 6.6 tire cord is characterized in that,
- the residual ply-yam twist in cord is higher than 30 tpm and less than 120 tpm.
- and cord twist in opposite direction of the residual twist is higher than 200 tpm and less than 400 tpm.
2. A two or three ply high performance nylon 6.6 tire cord of claim 1 in which the total nominal linear density of the said cord is higher than 2500 dtex and less than 9000 dtex.
3. A two or three ply high performance nylon 6.6 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 nylon 6.6 tire cord of claim 1 in which the ply yarns in said cord are nylon 6.
5. A two or three ply high performance nylon 6.6 tire cord of claim 1 in which the ply yarns in said cord are nylon 4.6
6. A two or three ply high performance nylon 6.6 tire cord of claim 1 in which the said cord is used as carcass reinforcement in bias and radial aircraft tires.
7. A two or three ply high performance nylon 6.6 tire cord of claim 1 in which the said cord is used as carcass reinforcement bias and radial off-the road tires.
7
SUBSTITUTE SHEETS (RULE 26)
EP18915257.2A 2017-12-07 2018-11-28 High performance nylon tire cords Withdrawn EP3720999A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2017/19810A TR201719810A2 (en) 2017-12-07 2017-12-07 HIGH PERFORMANCE NYLON TIRE CORD
PCT/TR2018/050740 WO2019203743A2 (en) 2017-12-07 2018-11-28 High performance nylon tire cords

Publications (2)

Publication Number Publication Date
EP3720999A2 true EP3720999A2 (en) 2020-10-14
EP3720999A4 EP3720999A4 (en) 2021-09-01

Family

ID=67952701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18915257.2A Withdrawn EP3720999A4 (en) 2017-12-07 2018-11-28 High performance nylon tire cords

Country Status (5)

Country Link
EP (1) EP3720999A4 (en)
KR (1) KR20200088893A (en)
CN (1) CN111670276A (en)
TR (1) TR201719810A2 (en)
WO (1) WO2019203743A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113550037A (en) * 2021-06-29 2021-10-26 三角轮胎股份有限公司 Nylon cord and tire thereof

Family Cites Families (10)

* 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
US3921691A (en) * 1968-10-11 1975-11-25 Ici Ltd Macrofilamentary yarns and rubber structures reinforced therewith
JP3118152B2 (en) * 1993-11-30 2000-12-18 株式会社ブリヂストン Pneumatic tire
EP1477333B1 (en) * 2002-01-24 2018-06-20 Bridgestone Corporation Pneumatic radial tire
JP2003226112A (en) * 2002-02-06 2003-08-12 Yokohama Rubber Co Ltd:The Pneumatic radial tire for heavy load
JP2004210194A (en) * 2003-01-07 2004-07-29 Bridgestone Corp Radial tire
DE102010017786A1 (en) * 2010-07-07 2012-01-12 Continental Reifen Deutschland Gmbh Elastomer product containing a linear textile structure for reinforcement
US20120211139A1 (en) * 2011-02-17 2012-08-23 Shulong Li Adhesion Composition and Textile Materials and Articles Treated Therewith
KR101260390B1 (en) * 2011-07-25 2013-05-21 한국타이어 주식회사 Hybride cord comprised of Aramid cord and Nylon 66, and Pneumatic Tire Using it as a Reinforcing Cord
FR3032150A1 (en) * 2015-02-03 2016-08-05 Michelin & Cie RADIAL TIRE HAVING IMPROVED BELT STRUCTURE

Also Published As

Publication number Publication date
TR201719810A2 (en) 2019-06-21
EP3720999A4 (en) 2021-09-01
KR20200088893A (en) 2020-07-23
CN111670276A (en) 2020-09-15
WO2019203743A3 (en) 2020-01-16
WO2019203743A2 (en) 2019-10-24

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