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
• • 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
• • 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]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S57/00—Textiles: spinning, twisting, and twining
  • Y10S57/902—Reinforcing or tire cords

Definitions

• ABSTRACT A pneumatic tire reinforcement element comprising a single bundle of continuous macrofilaments of synthetic polymeric material selected from the group consisting of polyester and polyamide, wherein each macrofilament has a denier in the range 100 to 1,500, and the bundle has a total denier of 1,000 to 10,000 and a twist level not exceeding 4 turns per inch.
• the present invention relates to filamentary yarns composed of macrofilaments and to pneumatic tires manufactured therewith
• macrofilament used herein is meant a monofilament having a denier greater than 50.
• Textile filamentary cords have previously been described for use in the manufacture of pneumatic tires.
• a typical exam pie is a cord formed from synthetic filaments by twisting a plurality of such filaments to form a yarn and then twisting together a number of these filamentary yarns.
• Each of the filaments in the cord has a denier of at least 10.
• a synthetic filamentary yarn having a total denier of 1,000 to 10,000, which comprises a plurality of macrofilaments, each macrofilament having a denier in the range 100 to 1,500, and which has a twist level not exceeding 4, turns per inch.
• a pneumatic tire comprises a tire building element, for example a breaker structure, incorporating synthetic filamentary yarns as defined in the preceding paragraph.
• the breaker structure may comprise two or more plies of yarns according to the invention.
• the yarns may be disposed at zero inclination or a small angle only, not exceeding 20, to the midcircumferential plane of the tire; and the yarns in one breaker ply may be disposed at zero inclination or at an angle, not exceeding 40, to those in the adjacent breaker ply or plies.
• a yarn in accordance with the invention is formed from polyester or polyamide macrofilaments.
• the preferred range of macrofilament denier is 200 to 700, desirably 400 to 600, and the total denier of the yarn is preferably in the range 2,000 to 5,000. It is preferable for each rnacrofilament in the yarn to be of the same denier.
• the number of macrofilaments forming the yarn is variable, for a given total yarn denier, it is preferred that the number of macrofilaments should be at least three and not greater than 20, and desirably should be seven.
• a synthetic filamentary yarn comprises seven synthetic macrofilaments, each of which has the same denier in the range 400 to 600, and the yarn has inserted therein about 2 turns per inch twist.
• This preferred yarn is circular in cross section and consequently has excellent packing characteristics coupled with desirable physical properties.
• the tenacity of each synthetic macrofilarnent is preferably greater than 5 grams per denier.
• the low twist yarns of the invention are preferably heat treated to modify certain yarn properties, for example shrinkage, prior to use. They may, for instance, be heat stretched or heat relaxed. The precise nature and temperature of such treatments will largely depend on the polymer from which the macrofilaments are formed.
• the yarns according to the invention exhibit a high compression modulus compared with known textile reinforcement materials, resulting in breaker structures of increased planar rigidity per unit weight of reinforcement material.
• the planar rigidity of the structure is defined as the resistance to shear and bending of the structure in the plane parallel with the reinforcing plies.
• this plane corresponds to the plane of the road contact patch of the tire.
• the yarns are particularly useful when used directly as reinforcement materials in pneumatic tires.
• the yarn may be supplied to tire manufacturers directly in the form suitable for use in tires or may be made into this form by the tire manufacturers from macrofilaments by a simple single-twisting operation,
• a pneumatic tire reinforcement element comprising a single bundle of continuous macrofilarnents of synthetic polymeric material selected from the group consisting of polyester and polyamide, wherein each macrofilament has a denier in the range to 1,500, and the bundle has a total denier of 1,000 to 10,000 and a twist level not exceeding 4 turns per inch.
• a synthetic filamentary element comprising seven synthetic macrofilaments, each of which has the same denier in the range 400 to 600, and the yarn has inserted therein about 2 turns per inch.
• a pneumatic tire comprising a tire building member incorporating reinforcement elements each of which comprises a single bundle of continuous macrofilaments of synthetic polymeric material selected from the group consisting of polyester and polyamide, and wherein each macrofilamcnt has a denier in the range 100 to 1,500, and each bundle has a total denier of 1,000 to 10,000 and a twist level not exceeding 4 turns per inch.

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 (1)

Publications (1)

Family

ID=10463838

Family Applications (1)

Country Status (12)

Cited By (10)

Families Citing this family (2)

Citations (8)

• 1968
  • 1968-11-05 GB GB52416/68A patent/GB1274223A/en not_active Expired
• 1969
  • 1969-11-03 US US874088A patent/US3638706A/en not_active Expired - Lifetime
  • 1969-11-03 NL NL6916559A patent/NL6916559A/xx unknown
  • 1969-11-03 ZA ZA697694A patent/ZA697694B/xx unknown
  • 1969-11-04 AT AT1036169A patent/AT305055B/de not_active IP Right Cessation
  • 1969-11-04 SE SE15111/69A patent/SE349608B/xx unknown
  • 1969-11-05 JP JP44088152A patent/JPS5134022B1/ja active Pending
  • 1969-11-05 FR FR6938087A patent/FR2022643A1/fr not_active Withdrawn
  • 1969-11-05 DE DE19691955691 patent/DE1955691A1/de active Pending
  • 1969-11-05 ES ES373184A patent/ES373184A1/es not_active Expired
  • 1969-11-05 CS CS729669A patent/CS158255B2/cs unknown
  • 1969-11-05 LU LU59760D patent/LU59760A1/xx unknown

Patent Citations (8)

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