WO2024096824A1 - Tissu câblé pour pneu - Google Patents

Tissu câblé pour pneu Download PDF

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Publication number
WO2024096824A1
WO2024096824A1 PCT/TR2022/051232 TR2022051232W WO2024096824A1 WO 2024096824 A1 WO2024096824 A1 WO 2024096824A1 TR 2022051232 W TR2022051232 W TR 2022051232W WO 2024096824 A1 WO2024096824 A1 WO 2024096824A1
Authority
WO
WIPO (PCT)
Prior art keywords
cords
paired
cord
cord fabric
tire
Prior art date
Application number
PCT/TR2022/051232
Other languages
English (en)
Inventor
Hazal OZCAN
Mehmet Sadettin Fidan
Caner IHTIYAR
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 PCT/TR2022/051232 priority Critical patent/WO2024096824A1/fr
Publication of WO2024096824A1 publication Critical patent/WO2024096824A1/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
    • B60C9/18—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

Definitions

  • the present invention relates to a reinforcement ply of a pneumatic tire wherein the paired cords are used instead of single cords as warp.
  • the cord reinforcements used as the carcass and the cap ply have twisted structures and circular cross-sections as it is shown in Figure 1 .
  • the twist directions of yams and cords are expressed with letters S and Z.
  • S twisted S-like twist
  • Z twisted Z-like twist
  • mbber matrix causes heat buildup and rolling resistance under dynamic conditions because of its viscoelastic behavior.
  • the ply thickness is calculated according to a cord diameter having required breaking strength for a given ply strength and optimized number of cords per unit length (epdm).
  • epdm number of cords per unit length
  • the cord diameter can be reduced by increasing the epdm (cord count) without changing the unit ply strength.
  • the increase in epdm also means a reduction in spacing between the cords which may cause poor bending and compression fatigue resistance in tire. For this reason, it is a very limited possibility to increase epdm without sacrificing tire durability.
  • Patent document numbered GB243705 present in the state of the art related with tire reinforcement fabric having side by side cords (warps) having opposite twist directions.
  • the possible goal could be balancing residual cord torques which may result in tip rise or curling in fabric during processing. Nevertheless, it does not mention the potential advantage of side-by-side cords with opposite twisting direction in tire performance, especially bending and compression fatigue resistance.
  • the other drawback of this document is the lack of the spacing (rivet) between the paired strips. Such fabrics without any rivet do not function in bias or radial tires and results in cord breaks under bending and compression.
  • FIG. 1 side view and top sectional view of prior art
  • FIG. 2 (a) side view and top sectional view of the tire cord fabric having paired cords with similar twists (b) side view and top sectional view of the single paired cord having similar twists.
  • FIG. 3 (a) side view and top sectional view of the tire cord fabric having paired cords with opposite twists (b) side view and top sectional view of the single paired cord having opposite twists.
  • FIG. 4 (a) view of the angular movements of the similar twisted cords under compression (b) view of the angular movements of the opposite twisted cords under compression.
  • FIG. 5 (a) view of the surface strain directions of the similar twisted cords under compression (b) view of the surface strain directions of the opposite twisted cords under compression.
  • FIG. 6 (a) view of the angular movements of the similar twisted cords under tension (b) view of the angular movements of the opposite twisted cords under compression.
  • FIG. 7 (a) view of the surface strain directions of the similar twisted cords under tension (b) view of the surface strain directions of the opposite twisted cords under compression.
  • FIG. 8 (a) view of the cord structure having Z yam twist/S cord twist (b) view of the cord structure having S yam twist/Z cord twist.
  • the objective of the present invention is to provide afire cord fabric having opposite twisted paired cords, namely S and Z twisted cords as pairs.
  • the invention is providing a tire cord fabric with reduced shear strain within and between the paired cords under dynamic conditions.
  • Further objective of the present invention is to provide a tire cord fabric which enables to use less rubber and higher content of cords in a given cord-rubber composite volume (thinner cords) resulting lighter pneumatic tire.
  • the tire cord fabric (1) according to the invention enables using less mbber and higher cord content in a given cord-mbber composite volume, and it can be used in vehicle tires as reinforcement by using the paired cords (2) connected to each other as warps.
  • the tire cord fabric (1) according to the invention is made of paired cords (2) to be used as reinforcement in pneumatic tires.
  • the paired cords (2) may have similar cord twists (5) such as S- S or Z-Z as shown in Figure 2 (a) and 2 (b).
  • opposite cord twists (6) such as S-Z or Z-S are used. This is shown in Figure 3(a) and 3(b).
  • the paired cord (2) structure is made of two cords (6) having opposite cord twists, namely S-Z or Z-S.
  • the shear strain between the mutual faces of the cords (6) having opposite cord twists (SZ or ZS) is less than the conventional SS or ZZ cords (5).
  • View of the angular movements of the similar or opposite twisted cords under compression is shown in Figure 4.
  • View of surface strain directions of the similar or opposite twisted cords under compression are shown in Figure 5.
  • View of the angular movements of the similar or opposite twisted cords under tension is shown in Figure 6.
  • View ofthe surface strain directions ofthe similar or opposite twisted cords under tension is shown in Figure 7.
  • the adhesive (7) fdling the spacing between the cords (3, 4) in paired cord (2) is the RFL (Resorcinol Formaldehyde Latex) film layer formed because of dipping the paired cord fabric (2) into RFL solution.
  • RFL Resorcinol Formaldehyde Latex
  • each paired cord (two cords) (2) is interconnected to each other with a suitable RFL film.
  • said paired cord fabric (2) structure there is a desired spacing between the paired cord (2) strips for rubber penetration to provide sufficient rubber adhesion and tire durability.
  • the ply stiffness is an important parameter controlling the tire performance. In case of cap ply, the ply stiffness controls the tire growth and belt-edge separation resistance(durability) under highspeed conditions.
  • strips containing paired cords comprises higher number of cords with the same rivet area(spacing) between paired cords of the reference strip.
  • Higher number of cords means higher ply stiffness. If ply stiffness increase higher than 12% of the reference, the tire performance improvement becomes significant. Higher ply stiffness means higher contractional force of the cap ply preventing tire growth and belt edge separation of the belt package under high-speed conditions.
  • cap ply strips with paired cords can be gauge(thickness) reduction by using thinner cords but by keeping ply stiffness constant.
  • the angular shear strain between the faces of SZ or ZS opposite twisted cord (6) type paired cords (3, 4) is less than the conventional applications.
  • the single cords having different twist directions (SZ or ZS) within pairs do not create any shear strains at contact interface within the pairs leading to the improved paired-cords stability. Therefore, the suitable cord spacing between the paired cords (2) can be narrower than that of the current tire cord reinforcements (O) having all cords the similar twisting direction (for example S-S twisted cord pairs (5).
  • SZ or ZS opposite twist cord pairs (6) have surface contact (parallel contact) between the mutual paired cords (2), whereas SS cord (3) or ZZ cord pairs (5) have point contact (cross contact).
  • the paired cords (2) have same balanced twists, but they are arranged in opposite directions.
  • the paired cord strips (2) (S-S, Z-Z (5) or S-Z (6) cord twist combinations) contain unbalanced twisted cords applying residual torque to each other.
  • the twists towards each other within the paired cord (2) increase separation resistance and stability in paired cords (2).
  • one of the cords within the paired cord (2) has unbalanced twist applying residual torque towards the other cord, whereas the other cord (the one which does not have residual torque anymore) has balanced twist.
  • the cords used in the paired cord (2) strip is made from a polymeric material selected from a group comprising Polyethylene terephthalate (PET), aramid, rayon, Polyethylene naphthalate (PEN), Nylon 66, Nylon 46 or PET/nylon and aramid/nylon blends.
  • PET Polyethylene terephthalate
  • PEN Polyethylene naphthalate
  • Nylon 66 Nylon 46 or PET/nylon and aramid/nylon blends.
  • the linear density of the cords (3, 4) used in the paired cord (2) is between 200 and 10.000 dtex.
  • the said value may be specifically between 1000 and 5.000 dtex, and more specifically 1500 and 4000.
  • the tire cord fabric (1) according to invention can be used as carcass reinforcement in passenger vehicle and light truck tires.
  • the number of the paired cords (2) in 10 cm changes between 25 to 110 (50 to 220 cords/ 10 cm).
  • the invention is a tire cord fabric of polymeric reinforcement for a pneumatic radial tire as spirally wound strips having a width of 5 to 25mm with 0 to 10 degrees to the circumferential plane of the tire, comprising paired cords used as warps, in which the single cords are connected to each other as pairs by adhesive dip.
  • the number of the paired cords in the said tire cord fabric in 10cm is minimum 25 and maximum 110(50 to 220 single cords/ 10cm).
  • the twist of each cord in each pair is in opposite direction like SZ or ZS.
  • the ply strength and ply stiffness of the paired cord fabric is at least 12% higher than that of the conventional cord fabric comprising the same single cords with the same cord-to-cord distance.
  • Paired cords are prepared from at least one polymeric material selected from the group comprising nylon 66, nylon 46, PET, PEN, or aramid. Paired cords have a total linear density between 200 and lO.OOOdtex.
  • Rivet - - - epdm-1 -
  • ply strength of fabric with paired cord is 124X where ply strength of regular fabric with single cord is 104X.
  • ply strength of fabric with paired cord is %19 higher.
  • the total ply strength of the paired cord fabric at the same dtex and the same rivet area is min 12% higher than the regular designed fabric.
  • Tire cord fabric of the invention is preferably manufactured from a totally or partially recycled polymer or totally or partially bio-based polymer.

Landscapes

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

Abstract

La présente invention concerne une nappe de renforcement d'un pneu, les câblés appariés étant utilisés à la place de câblés uniques en tant que chaîne.
PCT/TR2022/051232 2022-11-02 2022-11-02 Tissu câblé pour pneu WO2024096824A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/TR2022/051232 WO2024096824A1 (fr) 2022-11-02 2022-11-02 Tissu câblé pour pneu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR2022/051232 WO2024096824A1 (fr) 2022-11-02 2022-11-02 Tissu câblé pour pneu

Publications (1)

Publication Number Publication Date
WO2024096824A1 true WO2024096824A1 (fr) 2024-05-10

Family

ID=90931191

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2022/051232 WO2024096824A1 (fr) 2022-11-02 2022-11-02 Tissu câblé pour pneu

Country Status (1)

Country Link
WO (1) WO2024096824A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014060822A2 (fr) * 2012-10-18 2014-04-24 Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Tissu câblé pour pneu
EP3882050A1 (fr) * 2020-03-17 2021-09-22 The Goodyear Tire & Rubber Company Pneumatique et nappe de caoutchouc pour pneumatique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014060822A2 (fr) * 2012-10-18 2014-04-24 Kordsa Global Endüstriyel Iplik Ve Kord Bezi Sanayi Ve Ticaret Anonim Sirketi Tissu câblé pour pneu
EP3882050A1 (fr) * 2020-03-17 2021-09-22 The Goodyear Tire & Rubber Company Pneumatique et nappe de caoutchouc pour pneumatique

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