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
• • 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
• • 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
  • 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)

Applications Claiming Priority (2)

Publications (2)

Family

ID=67952425

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (12)

• 2017
  • 2017-12-07 TR TR2017/19814A patent/TR201719814A2/tr unknown
• 2018
  • 2018-11-28 WO PCT/TR2018/050741 patent/WO2019182539A2/en active Search and Examination
  • 2018-11-28 KR KR1020207018779A patent/KR20200088894A/ko not_active Application Discontinuation
  • 2018-11-28 CN CN201880088923.3A patent/CN111670275A/zh active Pending
  • 2018-11-28 EP EP18910982.0A patent/EP3720998A4/de not_active Withdrawn

Also Published As

Similar Documents

Legal Events