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Publication numberUS3419060 A
Publication typeGrant
Publication dateDec 31, 1968
Filing dateNov 6, 1964
Priority dateNov 19, 1963
Also published asDE1510599A1
Publication numberUS 3419060 A, US 3419060A, US-A-3419060, US3419060 A, US3419060A
InventorsGoy Ronald Stansfield
Original AssigneeDunlop Rubber Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Textile cord material and pneumatic tires manufactured therewith
US 3419060 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

United States Patent 3,419,060 TEXTILE CORD MATERIAL AND PNEUMATIC TIRES MANUFACTURED THEREWITH Ronald Stansfield Goy, Sutton Coldfield, England, assignor to Dunlop Rubber Company Limited, London, England, a British company No Drawing. Filed Nov. 6, 1964, Ser. No. 409,598 Claims priority, application Great Britain, Nov. 19, 1963, 45,538/63 4 Claims. (Cl. 152-359) ABSTRACT OF THE DISCLOSURE A synthetic hot stretched textile filamentary cord wherein each filament thereof in the finished form of the cord has a denier which is greater than thereby contributing superior resistance to buckling of the cord under axial compression loading.

My invention relates to textile cord material and to pneumatic tires manufactured therewith.

Steel cords made from a plurality of wires twisted together to form strands, the strands being twisted to form a cord, have been used in the manufacture of pneumatic tires for a considerable length of time and they are of advantage particularly in respect of their high tensile modulus (Youngs modulus) and their high resistance to buckling under axial load. Known textile cords are considered inferior to steel cords in these respects and it is an object of the invention to provide a synthetic textile filamentary cord which has an improved performance when compared with existing synthetic textile cords.

In the manufacture of synthetic textile filamentary cords, the filamentary size is usually kept to a minimum in view of the fact that spinning of the filaments is more convenient with a thin filament than with a thick one and, furthermore, the finished yarn is of ifiner texture which is more suitable for most purposes. In addition, while it is 'known to hot stretch nylon cords, to reduce subsequent tire growth, heat treatment is also carried out so as to prevent subsequent shrinkage of the material upon heating during vulcanisation and so as to set the material thus stabilizing its length.

According to my invention a synthetic textile filamentary cord comprises a plurality of filaments or monofilaments, having a denier greater than 10, twisted together, the cord having been heat-stretched to increase the tensile modulus of the cord and to increase the resistance of the cord to buckling under an axial compression load.

According to my invention also, a pneumatic tire comprises a tire building element, e.g. a rigid breaker, carcass, and a filler or chafer, incorporating synthetic textile filamentary cords as defined in the preceding paragraph.

Preferably a cord in accordance with the invention is formed from a polyester, and preferably the polyester is polyethylene terephthalate known as Terylene (registered Trademark). Alternatively the cord may be formed from polypropylene, rayon or nylon.

An embodiment of the invention will now be described by way of example.

A synthetic textile filamentary cord is made by spinning together 50 monofilaments of polyethylene terephthalate to form a yarn and twisting two of these yarns together to form the cord. The monofilaments are formed by a melt spinning process and a hot drawing process in known manner and have a denier of The cord is then subjected to a hot stretching process during which the cord is raised to a temperature near to the melting point of the constituent monofilaments and simultaneously stretched. This process may take place in a fluid bed such as is described in the specification of British Patent No. 885,513. Fluid beds are very effective in carryice ing out this process since high temperatures can be achieved without degradation of the material. As a result of this process the yarn denier is reduced but the filament denier remains substantially constant.

The cords are assembled in the form of a sheet, the cords being interconnected by a very weak weft material and, as is common in the tire-building art, the sheet of cords is treated with adhesive to increase the rubber-tocord bond strength and rubberised on both sides by means of a calender in known manner.

A pneumatic tire is constructed from a plurality of layers of these cords utilised in the breaker and/or carcass construction.

In one pneumatic tire construction, the cords in the carcass lie at to a circumferential line and the breaker comprises three layers of cords according to the invention, the cords in each of the layers being laid in a dilferent direction to the cords in any of the other layers and to the cords in the carcass.

In another pneumatic tire construction a 90 cord carcass is used and two, four or more, breaker layers are utilised, the cords in one layer crossing those in the next adjacent layer or layers and the cords being disposed at about 18 to the mid-circumferential plane of the tire.

It is an advantage to manufacture tires of the kind described above comprising cords according to the invention in view of the fact that the cords have, on the one hand, a high tensile modulus and, on the other hand, a high compressive modulus and increased resistance to buckling under axial compression loads compared with known textile cord material. The resulting tire has improved performance and wear characteristics compared with previously known textile tire constructions.

Having now described my invention, what I claim is:

1. A synthetic textile filamentary cord comprising two or more yarns twisted together, each 'of such yarns comprising a plurality of filaments each of which has a denier greater than 10, the cord having been heat-stretched to increase the tensile modulus of the cord and to increase the resistance of the cord to buckling under an axial compression load.

2. A pneumatic tire comprising a carcass of elastomeric material and a reinforcement in said carcass of a synthetic textile filamentary cord comprising two or more yarns twisted together, each of such yarns comprising a plurality of filaments each of which has a denier greater than 10, the cord having been heat-stretched to increase the tensile modulus of the cord and to increase the resistance of the cord to buckling under an axial compression load.

3. The pneumatic tire of claim 2 in which the cord is formed of a polyester.

4. The pneumatic tire of claim 3 in which the polyester is polyethylene terephthalate.

References Cited UNITED STATES PATENTS 2,273,200 2/1942 Hofi 57140 XR 2,324,583 7/1943 Jackson et al. 57-140 2,755,214 7/1956 Lyons et al. 152359 XR 2,991,817 7/1961 Gay et al l52359 XR 3,051,212 8/1962 Daniels 152330 3,195,603 7/1965 Ahles 152-359 2,235,867 3/1941 Castricum et al. 57140 XR 3,243,338 3/1966 Jackson 152-359 XR FOREIGN PATENTS 512,002 8/1929 Great Britain.

FRANK J. COHEN, Primary Examiner. D. E. WATKINS, Assistant Examiner.

US. Cl. X.R. 5714O

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2235867 *Dec 7, 1939Mar 25, 1941Us Rubber CoPneumatic tire
US2273200 *Nov 1, 1938Feb 17, 1942Du PontArtificial structure
US2324583 *May 21, 1941Jul 20, 1943Celanese CorpCord for use in the covers of pneumatic tires and other reinforced articles of rubber and similar materials
US2755214 *Jul 18, 1952Jul 17, 1956Firestone Tire & Rubber CoTire cord and method of making same
US2991817 *Sep 4, 1957Jul 11, 1961Firestone Tire & Rubber CoPneumatic tire construction
US3051212 *Jun 26, 1959Aug 28, 1962Du PontReinforced composite structures
US3195603 *Apr 14, 1964Jul 20, 1965Du PontPneumatic tire and process of manufacture
US3243338 *Aug 7, 1961Mar 29, 1966Dunlop Tire & Rubber CorpFlexible elastomeric articles and reinforcement therefor
GB512002A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3638706 *Nov 3, 1969Feb 1, 1972Ici LtdMacrofilamentary tire yarns
US3690362 *Sep 28, 1970Sep 12, 1972Allied ChemHigh strength polyethylene terephthalate yarn and cord produced therefrom
US3849976 *Apr 10, 1972Nov 26, 1974Ici LtdHigh modulus tire cord
US3858386 *Jul 6, 1971Jan 7, 1975Fiber Industries IncPolyester yarn production
US3889457 *Oct 6, 1969Jun 17, 1975Ici LtdMacrofilamentary yarns
US4043985 *Sep 17, 1976Aug 23, 1977Hoechst AktiengesellschaftTire monofilaments
US4328850 *Dec 4, 1980May 11, 1982The Toyo Rubber Industry Co., Ltd.Radial tire for truck and bus having specified tread to tire width ratio
US4715176 *Jun 2, 1986Dec 29, 1987Mitsuboshi Belting Ltd.Power transmission tensile cord and belt manufacture
US5442903 *Nov 23, 1993Aug 22, 1995Rhone-Poulenc FibresThermoset twist composed of synthetic monofilaments
DE2161967A1 *Dec 14, 1971Jun 20, 1973Hoechst AgReifendraht und verfahren zur herstellung dieses drahtes
WO2016091810A1Dec 7, 2015Jun 16, 2016Compagnie Generale Des Etablissements MichelinCellulose textile cord having an at least triple twist
WO2016091811A1Dec 7, 2015Jun 16, 2016Compagnie Generale Des Etablissements MichelinAramid textile cord with an at least triple twist
WO2016091812A1Dec 7, 2015Jun 16, 2016Compagnie Generale Des Etablissements MichelinHigh modulus textile cord with an at least triple twist
Classifications
U.S. Classification152/556, 57/236, 57/902
International ClassificationD03D11/00, D02G3/22, D02G3/48, B60C9/00
Cooperative ClassificationY10S57/902, D03D2700/0114, D10B2331/04, B60C9/0042, D02G3/48, D03D11/00
European ClassificationD03D11/00, D02G3/48, B60C9/00F