EP4352290A2 - A novel polyester carcass reinforcement - Google Patents

A novel polyester carcass reinforcement

Info

Publication number
EP4352290A2
EP4352290A2 EP22828900.5A EP22828900A EP4352290A2 EP 4352290 A2 EP4352290 A2 EP 4352290A2 EP 22828900 A EP22828900 A EP 22828900A EP 4352290 A2 EP4352290 A2 EP 4352290A2
Authority
EP
European Patent Office
Prior art keywords
dtex
cord
heat
carcass reinforcement
yam
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.)
Pending
Application number
EP22828900.5A
Other languages
German (de)
French (fr)
Other versions
EP4352290A4 (en
Inventor
Bahadir Kaya
Yusuf Alper GUL
Mehmet Sadettin Fidan
Caner IHTIYAR
Erhan KOP
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
Priority claimed from PCT/TR2022/050542 external-priority patent/WO2022271128A2/en
Publication of EP4352290A2 publication Critical patent/EP4352290A2/en
Publication of EP4352290A4 publication Critical patent/EP4352290A4/en
Pending 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
    • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
    • B60C2009/0085—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
    • B60C9/02—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 a process for manufacturing a novel polyester carcass reinforcement which has high tenacity improved tensile properties and high Modulus Enhancement Potential (MEP).
  • MEP Modulus Enhancement Potential
  • polyester yams should be stronger to help reducing weight of it without losing dimensional stability.
  • the carcass is one of the most important parts of a radial tire, transferring all forces from the road surface to the rim, interacting with the belt package and providing flexible sidewalls. As the carcass greatly influences handling, comfort and safety, its reinforcement plays an essential role with respect to the quality of the tire and thus to its performance and durability.
  • the tire manufacturer intends to reduce reinforcement material in tire weight while using lower denier yarns, higher tenacity and better MEP (Modulus Enhancement Potential) materials.
  • MEP Modulus Enhancement Potential
  • MEP Modulus Enhancement Potential
  • Balanced twisted reference greige test cord has twist multiplier between 22 and 23.
  • United States patent document no. US6887414 B2 discloses the high tenacity polyethylene terephthalate filaments which are useful in industrial applications, such as a tire cord for reinforcing rubber, a seat belt, a V-belt, and a hose. According to the document, efforts have been made to improve physical properties of a high tenacity industrial yam, in particular, a toughness of a treated cord and a dimensional stability, useful as a fiber reinforcement in a rubber tire. A method for producing high strength and low shrinkage polyester fibers with a uniform fineness and physical properties are stated in this patent.
  • the United States patent application with the publication number of US4827999 A relates to a polyester fiber having excellent thermal dimensional stability, chemical stability, as well as high tenacity; and to a process for the production thereof.
  • the cost of the starting materials of organic fibers for example nylon 6, the cost of the starting materials of polyesters (particularly of polyethylene terephthalate), has increased less and it is expected that this stable cost of polyesters will be maintained in future. This fact may promote enlarged demand for polyester high tenacity yarns.
  • a polyester fibre having excellent thermal dimensional stability and chemical stability as well as high tenacity which is a drawn yam produced by melt-spinning a polyester comprising predominantly polyethylene terephthalate, solidifying the spun yam and then drawing the yarn.
  • the polyester has specified properties such as intrinsic viscosity, diethylene glycol content, and carboxyl group content.
  • the yam has specified properties such as average birefringence, yarn tenacity and difference of average birefringence between surface and center of monofilament, and further low dry heat shrink and work loss when heat-treated.
  • the spinning and drawing are conducted under specified conditions.
  • the resultant polyester fiber is useful as a reinforcement for rubber goods, specifically as a tire cord.
  • the European patent document no EP0080906 B1 an application known in the state of the art, discloses use of a polyester tire cord fiber which has specified properties such as intrinsic viscosity, diethylene glycol content, and carboxyl group content, and the yarn has specified properties such as average birefringence, yarn tenacity and difference of average birefringence between surface and center of monofilament, and further low dry heat shrink and work loss when heat-treated.
  • the United States patent document no US6828021 B2 describes polyester multifilament yam with high modulus and low shrinkage particularly useful for the textile reinforcement of tires. This invention relates to polyester multifilament yarn with high modulus and low shrinkage particularly useful for the textile reinforcement of tires.
  • the yam of the invention provides high tenacity while maintaining or increasing dimensional stability with amorphous orientation function of less than about 0.75.
  • the described polyester fiber of this invention is produced with drawing under heated conditions has higher crystalline and amorphous orientation, in other words higher birefringence than that of conventional tire grade PET fibers.
  • An objective of the present invention is to provide a novel polyester carcass ply and production method.
  • Novel high-tenacity polyester tire cord of the invention improves the load capacity of tire and decreases the number reinforcement layer which makes the tire lighter and decreases the rubber content of the tire.
  • a Novel Polyester Carcass Reinforcement developed to fulfill the objectives of the present invention is clarified such that there is no limiting effect for the sake of better understanding.
  • the present invention relates to a carcass reinforcement comprising:
  • a drawn polyethylene terephthalate yam comprising at least 90 % PET by mole
  • Said yarn has minimum 8.8g/d tenacity and 2.8g/d 5% SASE
  • the greige cord, obtained by that yam, has at least 110 % modulus enhancement potential after being heat- set
  • the dipped and heat-set cord of the said yarn has maximum 0.20g/dtex shrinkforce at 180 °C under 0.05g/dtex pretension in 2 mins.
  • the present invention relates to a process for manufacturing a novel polyester tire cord reinforcement which has high tenacity tensile properties.
  • high purity chips (90 mol% or more PET chips) are subjected to a solid phase polymerization to obtain chips which has an intrinsic viscosity (IV) of 0.96 to 1.2.
  • these chips reach to extruder having temperature controllable zones which have set values between 230 and 320 °C.
  • the next step is melt-zone, comprise of manifold and spin-pack, which is kept under temperature control by a secondary heating medium with a temperature between 260 to 330 °C.
  • a secondary heating medium with a temperature between 260 to 330 °C.
  • Properly controlled melted polymer is pumped by gear pumps through the spinneret with certain number of holes depending on product type.
  • the quench zone starts.
  • the starting part of the quench zone with certain length is kept heated with electrical heaters between 180 and 400 °C. With the help of this higher temperature quench zone, the spun yarn finds residence area for slow cooling and avoids rapid quenching.
  • the spun yam After heated-quench zone, the spun yam enters into a quenching area that cool down the fibers with forced air supply. Spun filament yam delivered is firstly wrapped to feed roll. The drawing of yarn occurs in two different sections, and the draw ratio of first and second zones are 1.1 to 3.0, and 1.4 to 5.0 respectively. Each of the roll-sets, except first - feed roll, are heated to specific temperature.
  • the drawn filament yam coming from the last drawing roll is feed to the relaxing section with relax percentage of 0 % to 20% on roll set with certain temperature control.
  • Control samples A and B were compared with the invention (C) in Table 1. According to this, improved sample has higher tenacity and higher MEP (Modulus Enhancement Potential) parameter with same cord construction which has 1670 dtex, 2 plies, 390*390 TPM (twist number per meter) and heat treated at 250 °C under 1.2g/dtex stress for 30 secs under static conditions in Testrite apparatus (%). The cords that heat set at 250 °C under 1.2g/dtex stress were freely waited in the laboratory conditions without any tension and then measurements in the Table 1 were taken via Instron testing apparatus. Table 1. MEP Comparison of Control A & B vs Invention (C)
  • Twist Multiplier Twist (tpm) x (Vtotal dtex) / 1000
  • MEP Modulus Enhancement Potential: Stress increase at 5% elongation after being heat-set at 250 °C under 1.2g/dtex stress for 30secs under static conditions in Testrite apparatus (%). Instron testing after 1 hour relaxation at 20-25 °C with free ends. Balanced twisted reference greige test cord has twist multiplier between 22 and 23.
  • the MEP value higher than 110% provides sufficient resist to tire growth under high speed driving conditions and improves high speed durability of the tire.
  • the cord shrinkforce less than 0.20g/dtex provides sufficient uniformity after curing process at splice zone of the carcass layer and reduces sidewall indentation (SWI).
  • the 5 % SASE of the said dipped and heat-set cord is between 2.0g/dtex and 4.0g/dtex and because provides sufficient dimensional stability with enough fatigue resistance, it is preferably 2.5 g/dtex and 3.5 g/dtex.
  • the useful linear density range of the PET yarn is between 300 and 3500 dtex. Lower than 300 dtex yarns are more expensive and the higher than 3500 dtex might not have sufficient uniformity.

Landscapes

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

Abstract

The present invention relates to a process for manufacturing a novel polyester carcass reinforcement which has high tenacity improved tensile properties and high Modulus Enhancement Potential (MEP).

Description

A NOVEL POLYESTER CARCASS REINFORCEMENT
Field of the Invention
The present invention relates to a process for manufacturing a novel polyester carcass reinforcement which has high tenacity improved tensile properties and high Modulus Enhancement Potential (MEP).
Background of the Invention
The most common tires like passenger cars and light commercial vehicles are in the trend of change. The main reason is environmental concerns and government initiatives on emission, fuel economy and noise. Therefore, the regulations demanding higher fuel economy are possibly the most immediate and important driver of change. As a raw material of tire, polyester yams should be stronger to help reducing weight of it without losing dimensional stability.
The carcass is one of the most important parts of a radial tire, transferring all forces from the road surface to the rim, interacting with the belt package and providing flexible sidewalls. As the carcass greatly influences handling, comfort and safety, its reinforcement plays an essential role with respect to the quality of the tire and thus to its performance and durability. The tire manufacturer intends to reduce reinforcement material in tire weight while using lower denier yarns, higher tenacity and better MEP (Modulus Enhancement Potential) materials. MEP (Modulus Enhancement Potential) is stress increase at 5% elongation after being heat-set at 250°C under 1.2g/dtex stress for 30 secs under static conditions in Testrite apparatus (%). Balanced twisted reference greige test cord has twist multiplier between 22 and 23. United States patent document no. US6887414 B2 discloses the high tenacity polyethylene terephthalate filaments which are useful in industrial applications, such as a tire cord for reinforcing rubber, a seat belt, a V-belt, and a hose. According to the document, efforts have been made to improve physical properties of a high tenacity industrial yam, in particular, a toughness of a treated cord and a dimensional stability, useful as a fiber reinforcement in a rubber tire. A method for producing high strength and low shrinkage polyester fibers with a uniform fineness and physical properties are stated in this patent.
The United States patent application with the publication number of US4827999 A relates to a polyester fiber having excellent thermal dimensional stability, chemical stability, as well as high tenacity; and to a process for the production thereof. In spite of recent significant increases in the cost of the starting materials of organic fibers, for example nylon 6, the cost of the starting materials of polyesters (particularly of polyethylene terephthalate), has increased less and it is expected that this stable cost of polyesters will be maintained in future. This fact may promote enlarged demand for polyester high tenacity yarns. A polyester fibre having excellent thermal dimensional stability and chemical stability as well as high tenacity, which is a drawn yam produced by melt-spinning a polyester comprising predominantly polyethylene terephthalate, solidifying the spun yam and then drawing the yarn. The polyester has specified properties such as intrinsic viscosity, diethylene glycol content, and carboxyl group content. The yam has specified properties such as average birefringence, yarn tenacity and difference of average birefringence between surface and center of monofilament, and further low dry heat shrink and work loss when heat-treated. The spinning and drawing are conducted under specified conditions. The resultant polyester fiber is useful as a reinforcement for rubber goods, specifically as a tire cord.
The European patent document no EP0080906 B1 an application known in the state of the art, discloses use of a polyester tire cord fiber which has specified properties such as intrinsic viscosity, diethylene glycol content, and carboxyl group content, and the yarn has specified properties such as average birefringence, yarn tenacity and difference of average birefringence between surface and center of monofilament, and further low dry heat shrink and work loss when heat-treated. The United States patent document no US6828021 B2 describes polyester multifilament yam with high modulus and low shrinkage particularly useful for the textile reinforcement of tires. This invention relates to polyester multifilament yarn with high modulus and low shrinkage particularly useful for the textile reinforcement of tires. The yam of the invention provides high tenacity while maintaining or increasing dimensional stability with amorphous orientation function of less than about 0.75. The described polyester fiber of this invention is produced with drawing under heated conditions has higher crystalline and amorphous orientation, in other words higher birefringence than that of conventional tire grade PET fibers.
Summary of the Invention
An objective of the present invention is to provide a novel polyester carcass ply and production method. Novel high-tenacity polyester tire cord of the invention improves the load capacity of tire and decreases the number reinforcement layer which makes the tire lighter and decreases the rubber content of the tire. Detailed Description of the Invention
“A Novel Polyester Carcass Reinforcement” developed to fulfill the objectives of the present invention is clarified such that there is no limiting effect for the sake of better understanding. The present invention relates to a carcass reinforcement comprising:
• A drawn polyethylene terephthalate yam comprising at least 90 % PET by mole,
• Said yarn has minimum 8.8g/d tenacity and 2.8g/d 5% SASE,
• The greige cord, obtained by that yam, has at least 110 % modulus enhancement potential after being heat- set,
• The dipped and heat-set cord of the said yarn has maximum 0.20g/dtex shrinkforce at 180 °C under 0.05g/dtex pretension in 2 mins.
The present invention relates to a process for manufacturing a novel polyester tire cord reinforcement which has high tenacity tensile properties.
For the production of high tenacity fibers, high purity chips (90 mol% or more PET chips) are subjected to a solid phase polymerization to obtain chips which has an intrinsic viscosity (IV) of 0.96 to 1.2. In the next step, these chips reach to extruder having temperature controllable zones which have set values between 230 and 320 °C.
The next step is melt-zone, comprise of manifold and spin-pack, which is kept under temperature control by a secondary heating medium with a temperature between 260 to 330 °C. Properly controlled melted polymer is pumped by gear pumps through the spinneret with certain number of holes depending on product type. After generating filaments by using spinneret, the quench zone starts. The starting part of the quench zone with certain length is kept heated with electrical heaters between 180 and 400 °C. With the help of this higher temperature quench zone, the spun yarn finds residence area for slow cooling and avoids rapid quenching.
After heated-quench zone, the spun yam enters into a quenching area that cool down the fibers with forced air supply. Spun filament yam delivered is firstly wrapped to feed roll. The drawing of yarn occurs in two different sections, and the draw ratio of first and second zones are 1.1 to 3.0, and 1.4 to 5.0 respectively. Each of the roll-sets, except first - feed roll, are heated to specific temperature.
As a next step, the drawn filament yam coming from the last drawing roll is feed to the relaxing section with relax percentage of 0 % to 20% on roll set with certain temperature control. Finally, the drawn yam winded at a speed of 3500 to 6500 m/min.
Control samples A and B were compared with the invention (C) in Table 1. According to this, improved sample has higher tenacity and higher MEP (Modulus Enhancement Potential) parameter with same cord construction which has 1670 dtex, 2 plies, 390*390 TPM (twist number per meter) and heat treated at 250 °C under 1.2g/dtex stress for 30 secs under static conditions in Testrite apparatus (%). The cords that heat set at 250 °C under 1.2g/dtex stress were freely waited in the laboratory conditions without any tension and then measurements in the Table 1 were taken via Instron testing apparatus. Table 1. MEP Comparison of Control A & B vs Invention (C)
The definitions of the parameters belonging to the samples are given below:
• 5 % SASE: Stress at 5 % elongation (g/dtex)
• Twist Multiplier (T.M.): Twist (tpm) x (Vtotal dtex) / 1000
• MEP (Modulus Enhancement Potential): Stress increase at 5% elongation after being heat-set at 250 °C under 1.2g/dtex stress for 30secs under static conditions in Testrite apparatus (%). Instron testing after 1 hour relaxation at 20-25 °C with free ends. Balanced twisted reference greige test cord has twist multiplier between 22 and 23.
The following technical results have been found in line with the parameters of the polyester tire cord reinforcement obtained within the scope of the invention.
• Tenacity higher than 8.8g/d enables to use thinner reinforcements in tire leading to weight and rolling resistance reduction.
• The 5% SASE higher than 2.8g/d help to obtain high modulus tire cord reinforcement after being dipped and heat-set in hot stretching process.
• The MEP value higher than 110% provides sufficient resist to tire growth under high speed driving conditions and improves high speed durability of the tire.
• The cord shrinkforce less than 0.20g/dtex provides sufficient uniformity after curing process at splice zone of the carcass layer and reduces sidewall indentation (SWI).
• The 5 % SASE of the said dipped and heat-set cord is between 2.0g/dtex and 4.0g/dtex and because provides sufficient dimensional stability with enough fatigue resistance, it is preferably 2.5 g/dtex and 3.5 g/dtex.
• The useful linear density range of the PET yarn is between 300 and 3500 dtex. Lower than 300 dtex yarns are more expensive and the higher than 3500 dtex might not have sufficient uniformity.
• The cord twist multiplier between 15 and 30 provides sufficient compression fatigue resistance of the carcass under dynamic conditions.

Claims

1. A carcass reinforcement comprising:
• a drawn polyethylene terephthalate yam comprising at least 90 % PET by mole,
• said yam has minimum 8.8g/d tenacity and 2.8g/d 5% SASE,
• the greige cord, obtained by that yam, has at least 110 % modulus enhancement potential after being heat- set,
• the dipped and heat-set cord of the said yam has maximum 0.20g/dtex shrinkforce at 180 °C under 0.05g/dtex pretension in 2 mins.
2. A carcass reinforcement according to Claim 1, wherein 5 % SASE of the said dipped and heat-set cord is between 2.0 g/dtex and 4.0 g/dtex.
3. A carcass reinforcement according to Claim 2, wherein 5 % SASE of the said dipped and heat-set cord is between 2.5 g/dtex and 3.5 g/dtex.
4. A carcass reinforcement according to any one of the preceding claims, wherein the linear density of the said polyethylene terephthalate yarn in cord plies is minimum 300 dtex and maximum 3500 dtex.
5. A carcass reinforcement according to any one of the preceding claims, wherein twist multiplier of the said dipped and heat-set cord is between 15 and 30.
6. A carcass reinforcement according to any one of the preceding claims, wherein the said dipped and heat-set polyethylene terephthalete cord is used as carcass ply in pneumatic radial tires as dipped and heat-set cord.
EP22828900.5A 2021-06-07 2022-06-07 NEW POLYESTER CARCASS REINFORCEMENT Pending EP4352290A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR202110189 2021-06-07
PCT/TR2022/050542 WO2022271128A2 (en) 2021-06-22 2022-06-07 A novel polyester carcass reinforcement

Publications (2)

Publication Number Publication Date
EP4352290A2 true EP4352290A2 (en) 2024-04-17
EP4352290A4 EP4352290A4 (en) 2025-01-08

Family

ID=90231717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22828900.5A Pending EP4352290A4 (en) 2021-06-07 2022-06-07 NEW POLYESTER CARCASS REINFORCEMENT

Country Status (1)

Country Link
EP (1) EP4352290A4 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414169A (en) * 1979-02-26 1983-11-08 Fiber Industries, Inc. Production of polyester filaments of high strength possessing an unusually stable internal structure employing improved processing conditions
JP5802761B2 (en) * 2010-12-29 2015-11-04 コーロン インダストリーズ インク Polyethylene terephthalate drawn yarn, tire cord, and production method thereof
KR102127495B1 (en) * 2015-09-25 2020-06-26 코오롱인더스트리 주식회사 Poly(ethyleneterephthalate) Yarn, Method for Manufacturing The Same, and Tire Cord Manufactured Using The Same

Also Published As

Publication number Publication date
EP4352290A4 (en) 2025-01-08

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