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US 12,370,833 B2Granted
Rubberized strength member for elastomeric products, in particular vehicle tyres, wherein the strength member has at least one first yarn, method for producing the rubberized strength member, and vehicle tyre having at least one rubberized strength member
AssigneeContinental Reifen Deutschland GmbH
InventorsThomas Kramer, Nermeen Nabih, Wolfgang Reese, Michael Schunack
Life of this patent
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Abstract
The invention relates to a rubberized strength member for elastomeric products, especially vehicle tires, wherein the strength member includes at least one first yarn, to a process for producing the rubberized strength member and to a motor vehicle tire including at least one rubberized strength member. According to the invention, the first yarn is a yarn of HMLS-PET comprising recycled PET.
Claims18
A rubberized strength member for elastomeric products comprising:
- at least one first yarn comprised of a High Modulus Low Shrinkage polyethylene terephthalate (HMLS-PET) comprising recycled PET;
- wherein the first yarn is twisted in a x2 cord, where the cord has a twist factor of 150 to 250 and a breaking force of at least 6.3 g/den and has an elongation at 45 N of less than 0.0056%/den and hot shrinkage of less than 3%;
- wherein the first yarn of HMLS-PET has a crystallization level of 45% to 53.5%.
A process for producing a rubberized strength member comprising:
- a) providing PET chips comprising 100% by weight of recycled PET from PET bottles or other PET products and optionally provision of chips of virgin PET;
- b) performing pre-crystallization, crystallization and solid-state polymerization of the PET from a) to give high-viscosity PET chips having an intrinsic viscosity of 0.85 to 1.15 dl/g;
- c) drying, and mixing the chips of recycled PET with chips of virgin PET to obtain PET chips comprising up to 10% to 100% by weight of chips from recycled PET, melting and extruding of the PET chips for the yarn spinning, subsequent yarn spinning by means of a spinneret comprising a reheater having a buffer zone with the high-viscosity PET chips from step b), and stepwise cooling of the unstretched yarn, wherein the water content of the chips after drying is less than 30 ppm, the temperature of the reheater beneath the spinneret is 280 to 350° C. and the length of the buffer zone beneath the reheater during the stepwise cooling is 20 to 100 mm;
- d) oiling, drawing, heat-setting and winding after the stepwise cooling in step c) to obtain an HMLS-PET yarn;
- e) twisting;
- f) weaving;
- g) performing modification of adhesion with a dip;
- h) performing rubberization with a rubberization mixture;
- wherein the first yarn is twisted in a x2 cord, where the cord has a twist factor of 150 to 250 and a breaking force of at least 6.3 g/den and has an elongation at 45 N of less than 0.0056%/den and hot shrinkage of less than 3%;
- wherein the first yarn of HMLS-PET has a crystallization level of 45% to 53.5%.
7 more elements
A vehicle tire comprising:
- a sidewall having a plurality of strength members;
- the plurality of strength members comprised of a High Modulus Low Shrinkage polyethylene terephthalate (HMLS-PET) comprising recycled PET, 50% to 100% by weight, of recycled PET, 0.12% to 2.2% by weight, of isophthalic acid (IPA), a crystallization level of 45% to 53.5%, a fineness of 300 to 4000 denier (den), hot shrinkage of less than 8% and elongation at 45 N of less than 0.0056%/den, and a x2 cord, where the cord has a twist factor of 150 to 250 and a breaking force of at least 6.3 g/den and has an elongation at 45 N of less than 0.0056%/den and hot shrinkage of less than 3%.
Dependencies are inferred from the claim text.