EP0086285A1 - Cordages de raquettes - Google Patents

Cordages de raquettes Download PDF

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Publication number
EP0086285A1
EP0086285A1 EP82300662A EP82300662A EP0086285A1 EP 0086285 A1 EP0086285 A1 EP 0086285A1 EP 82300662 A EP82300662 A EP 82300662A EP 82300662 A EP82300662 A EP 82300662A EP 0086285 A1 EP0086285 A1 EP 0086285A1
Authority
EP
European Patent Office
Prior art keywords
string
racket
microns
particles
fluororesin
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.)
Withdrawn
Application number
EP82300662A
Other languages
German (de)
English (en)
Inventor
Tamanosuke Ohara
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.)
Gosen Co Ltd
Van Rijswijk Jacob
Original Assignee
Gosen Co Ltd
Van Rijswijk Jacob
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 Gosen Co Ltd, Van Rijswijk Jacob filed Critical Gosen Co Ltd
Priority to EP82300662A priority Critical patent/EP0086285A1/fr
Publication of EP0086285A1 publication Critical patent/EP0086285A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/10—Reinforcements for stringing
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/02—Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear

Definitions

  • the invention relates to racket strings and more particularly to a racket for use in tennis, badminton, squash, etc., incorporating such a string.
  • materials for natural or synthetic strings suitable for use as strings for rackets are conventionally classified into natural materials such as animal parts (commonly referred to as gut), e.g. intestines of sheep, whale tissue, etc., and synthetic polymeric material, for example, synthetic resins such as polyamide, nylon, etc.
  • natural materials such as animal parts (commonly referred to as gut), e.g. intestines of sheep, whale tissue, etc.
  • synthetic polymeric material for example, synthetic resins such as polyamide, nylon, etc.
  • the synthetic resin or natural string is stretched onto the racket and after the longitudinal strings have been formed, the lateral strings are threaded through the longitudinal strings at a high tension; in so doing friction between the longitudinal and lateral strings may readily cause damage to the strings.
  • oils for example, paraffin oil or silicone oil
  • silicone oil it has been usual to apply oils, for example, paraffin oil or silicone oil, to the string at the time of stretching the string onto a racket or to apply such oils or polyolefin or various wax emulsions to the string at the time of manufacture of the string to reduce the incidence of damage to the string during racket stringing and wear of the string due to frictional heat produced between longitudinal and lateral strings during play.
  • the present invention provides:
  • the fluororesin is a fluorinated ethylene resin, especially a tetrafluoroethylene resin. particle diameter
  • a resin preferably has an average/in the range of from 0.1 to 10 microns, especially of 0.3 microns.
  • the string generally includes a string body 1 made, for example, of synthetic resins, for example, polyamide group synthetic fibres, or natural materials, for example, intestines of sheep and whale tissue, and a coating film 2 formed around the surface of the string body 1.
  • the coating film 2 is formed by applying a dispersion of particles of a fluororesin, suitably a tetrafluoroethylene resin (dispersed either in a solvent or in a molten resin liquid), to the surface of the string body 1.
  • the coating may be applied with a spray, or by passing the string body 1 through the dispersion, after which the coating film 2 is dried.
  • a string when provided with the coating film 2 is less susceptible to damage than conventional strings, the coating providing a bearing or low friction effect which improves the wear resistance of the string.
  • the string may be formed with recessed portions.
  • recesses can be formed by the gaps between the monofilaments if they are twisted or plaited together or if one or more monofilaments are wound (preferably helically) round a core (formed by one or more monofilaments).
  • the fluororesin (preferably tetrafluoroethylene resin) particles have an average particle diameter in the range of from 0.1 microns to 10 microns and preferably of about 0 . 3 microns.
  • the average particle diameter is 20 microns or more the aforesaid bearing effect is less pronounced and the wear-resistance of the string is commensurately reduced. It is thought that this is because not enough of the fluororesin particles adhere to the (even if the Facticles areincorporated inasuitable fispevsion) stringlduring the coating process and, as a result, the final coating is made up predominantly of the dispersing medium.
  • Specimen A is prepared by passing a string body of polyamide resin prepared by an ordinary method (for example, a 0.16 mm diameter winding string wound doubly around a 0.8 mm diameter core string) through a dispersion of 4%, by weight, or paste tetrafluoroethylene powder/having an average particle diameter of 0.3 microns in a dispersing medium mainly composed of 1, 1, 1 trichloroethane, and drying the coating sticking to the string body.
  • Specimen B is a conventional string having a similar body to string A but not treated with tetrafluoroethylene and Specimen or paste C is prepared by applying tetrafluoroethylene powder having an average particle diameter of 20 microns to a string body (again similar to that of string A).
  • the frictional cutting test can be performed after 18 columns of longitudinal strings lla have been stretched on an ordinary (e.g. wooden) tennis racket 10 at a tension of about 70 pounds and seven rows of lateral strings llb have been stretched on the racket 10 from the longitudinal uppermost portion thereof at a tension of 70 pounds.
  • the portion of string extending (by about 1.5 m) to one side of the racket 10 is then repeatedly pulled (e.g. manually) to its full length (i.e. 1.5 m per stroke) until any of the longitudinal strings lla is cut apart.
  • the string A has a 10 to 20 times greater wear resistance than a conventional string or a string coated with a dispersion of tetrafluoroethylene particles of average particle diameter of 20 microns.
  • String A can not only better withstand high tension during stringing of the racket, but also lessens wear of the string produced at the points of intersection between longitudinal and lateral strings at the time of hitting of balls and wear due to the presence of sand and dust, etc., at the time of playing when incorporated into a racket.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP82300662A 1982-02-10 1982-02-10 Cordages de raquettes Withdrawn EP0086285A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP82300662A EP0086285A1 (fr) 1982-02-10 1982-02-10 Cordages de raquettes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82300662A EP0086285A1 (fr) 1982-02-10 1982-02-10 Cordages de raquettes

Publications (1)

Publication Number Publication Date
EP0086285A1 true EP0086285A1 (fr) 1983-08-24

Family

ID=8189572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300662A Withdrawn EP0086285A1 (fr) 1982-02-10 1982-02-10 Cordages de raquettes

Country Status (1)

Country Link
EP (1) EP0086285A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2167094A (en) * 1984-11-01 1986-05-21 Rucanor Bv String for sports racquets
EP1081270A1 (fr) * 1999-08-24 2001-03-07 E.I. Du Pont De Nemours And Company Modification de cordes pour équipement à cordes et instruments de musique à l'aide d'un polymère fluoré

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428810A1 (de) * 1961-07-13 1968-12-12 Gerhard Babucke Praeparat zur Erhoehung der Griffigkeit von Saiten,insbesondere Kunststoffsaiten,fuer Tennis- und Federballschlaeger u.a.
US3920658A (en) * 1972-01-20 1975-11-18 Martin James Benson Coated tennis string and process for coating
US4238262A (en) * 1978-07-26 1980-12-09 Fishel Clark W Applying particles and adhesive to racquet strings
US4300343A (en) * 1978-07-27 1981-11-17 Kureha Kagaku Kogyo Kabushiki Kaisha Gut
US4306410A (en) * 1980-11-12 1981-12-22 Kureha Kagaku Kogyo Kabushiki Kaisha String construction for athletic rackets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428810A1 (de) * 1961-07-13 1968-12-12 Gerhard Babucke Praeparat zur Erhoehung der Griffigkeit von Saiten,insbesondere Kunststoffsaiten,fuer Tennis- und Federballschlaeger u.a.
US3920658A (en) * 1972-01-20 1975-11-18 Martin James Benson Coated tennis string and process for coating
US4238262A (en) * 1978-07-26 1980-12-09 Fishel Clark W Applying particles and adhesive to racquet strings
US4300343A (en) * 1978-07-27 1981-11-17 Kureha Kagaku Kogyo Kabushiki Kaisha Gut
US4306410A (en) * 1980-11-12 1981-12-22 Kureha Kagaku Kogyo Kabushiki Kaisha String construction for athletic rackets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2167094A (en) * 1984-11-01 1986-05-21 Rucanor Bv String for sports racquets
EP1081270A1 (fr) * 1999-08-24 2001-03-07 E.I. Du Pont De Nemours And Company Modification de cordes pour équipement à cordes et instruments de musique à l'aide d'un polymère fluoré
US6835454B1 (en) 1999-08-24 2004-12-28 Stuart Karl Randa Fluoropolymer modification of strings for stringed sports equipment and musical instruments

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19840220

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850521

RIN1 Information on inventor provided before grant (corrected)

Inventor name: OHARA, TAMANOSUKE