EP0257424A2 - Tennis string, tennis racket stringing made of it and method of making the tennis string - Google Patents

Tennis string, tennis racket stringing made of it and method of making the tennis string Download PDF

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Publication number
EP0257424A2
EP0257424A2 EP87111544A EP87111544A EP0257424A2 EP 0257424 A2 EP0257424 A2 EP 0257424A2 EP 87111544 A EP87111544 A EP 87111544A EP 87111544 A EP87111544 A EP 87111544A EP 0257424 A2 EP0257424 A2 EP 0257424A2
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EP
European Patent Office
Prior art keywords
tennis
core
string
coated
tennis string
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Withdrawn
Application number
EP87111544A
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German (de)
French (fr)
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EP0257424A3 (en
Inventor
Otto Schwertl
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Individual
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Individual
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Publication of EP0257424A2 publication Critical patent/EP0257424A2/en
Publication of EP0257424A3 publication Critical patent/EP0257424A3/en
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    • 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 a tennis string made of a coated elastic core made of untwisted or twisted plastic fibers, a tennis racket stringing consisting thereof and a method for producing the tennis string.
  • gut strings do have the required elasticity, ball acceleration and playing comfort properties, but have the very big disadvantage that a long lifespan is not guaranteed and, on the other hand, can only be played depending on the weather, ie only in completely dry weather; because the gut string is very sensitive even when there is noticeable humidity or even rain, then fibers and tears very quickly, which is perceived by the players as a very big disadvantage because of the relatively expensive cost price.
  • the synthetic string In contrast to the gut string, the synthetic string has a longer lifespan, is weather-independent and cheaper, but lacks the main properties that a tennis string should have, namely good elasticity and high ball acceleration.
  • a core made of twisted wire or fiber material for. B. made of steel wire, glass fibers or carbon fibers, and coated with plastic, in particular a fluorocarbon resin.
  • the invention has for its object to develop a tennis string of the type mentioned that an even better combination of the desired properties, ie. H. the elasticity, the high ball acceleration, the tensile strength and the playing comfort when used as a tennis racket string, with a weather independence and a comparable or superior life expectancy to plastic strings, and to specify a manufacturing process for this tennis string.
  • the desired properties ie. H. the elasticity, the high ball acceleration, the tensile strength and the playing comfort when used as a tennis racket string, with a weather independence and a comparable or superior life expectancy to plastic strings, and to specify a manufacturing process for this tennis string.
  • the core fibers consist of aramid "KEVLAR” (R).
  • the invention also relates to the tennis racket stringing consisting of a tennis string according to the invention.
  • the stated object is achieved according to the invention by a method for producing the tennis string with the characteristic that an elastic core made of untwisted or twisted, e.g. braided aramid fibers is coated by extrusion.
  • the desired combination of the desired properties can be attributed to the "KEVLAR" aramid fibers as the core material.
  • the coating can also be applied to the core consisting of untwisted or twisted aramid fibers instead of by extrusion by an impregnation or immersion process.
  • a tennis string 1 which is composed of a core 2 of approximately 1.1 mm in diameter and a coating 3 of approximately 0.15 mm in thickness, so that the overall diameter is approximately 1.4 mm.
  • the core 2 consists of a large number of hair-fine, twisted, for example approximately 10,000 braided "KEVLAR" aramid fibers
  • the coating 3 consists, for example, of a fluorocarbon resin applied by extrusion at approximately 360 ° C., in particular polytetrafluoroethylene or fluoroethylene propylene or a copolymer of ethylene and tetrafluoroethylene with a smooth surface.
  • This tennis string has a tensile strength of 120 kg (1177 N) with low elongation at break as well as good fatigue resistance, vibration damping and impact resistance.
  • coatings made of polyester, polyamide or polyurethane material or a mixture of carbon and an organic binder can also be used.
  • FIG. 2 shows a tennis racket frame R with the stringing according to the invention from the tennis string 1 according to FIG. 1.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Ropes Or Cables (AREA)

Abstract

This tennis string (1) comprises a coated elastic core made from untwisted or twisted plastic fibres (2). In order to achieve an improved combination of the desired properties, i.e. elasticity, high ball acceleration, tear strength and playing comfort when used as tennis racquet stringing, with weathering resistance and long life, the core fibres (2) comprise aramid "KEVLAR" (R). The aramid fibres (2), which are, for example, pleated, preferably have a coating (3) of fluorocarbon resin, in particular polytetrafluoroethylene or fluoroethylene-propylene or a copolymer of ethylene and tetrafluoroethylene. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Tennissaite aus einem beschichteten elastischen Kern aus unverzwirnten oder ver­zwirnten Kunststoffasern, eine daraus bestehende Tennis­schlägerbesaitung und ein Verfahren zur Herstellung der Tennissaite.The invention relates to a tennis string made of a coated elastic core made of untwisted or twisted plastic fibers, a tennis racket stringing consisting thereof and a method for producing the tennis string.

Seit Bestehen des Tennissports existiert das Problem der Besaitung. Bis jetzt gibt es vor allem zwei Arten von Besaitungs­material, nämlich Darmsaiten und Kunststoffsaiten. Die primären Eigenschaften, die eine Tennissaite besitzen soll, sind Elastizität, hohe Ballbeschleunigung, Spielkomfort und Lebensdauer.The problem of stringing has existed since tennis existed. So far, there are two main types of stringing material, namely gut strings and plastic strings. The primary properties that a tennis string should have are elasticity, high ball acceleration, playing comfort and durability.

Die bisher verwendeten und allgemein bekannten Darmsaiten haben zwar die erforderlichen Elastizitäts-, Ballbeschleunigungs- und Spielkomforteigenschaften, besitzen aber den sehr großen Nachteil, daß keine lange Lebensdauer gewährleistet ist und anderer­seits damit nur witterungsabhängig, d. h. nur bei völlig trockenem Wetter gespielt werden kann; denn schon bei merklicher Luft­feuchtigkeit oder gar bei Regen ist die Darmsaite sehr empfindlich, fasert und reißt dann sehr schnell, was bei den Spielern wegen des relativ teuren Gestehungspreises als sehr großer Nachteil empfunden wird.The previously used and generally known gut strings do have the required elasticity, ball acceleration and playing comfort properties, but have the very big disadvantage that a long lifespan is not guaranteed and, on the other hand, can only be played depending on the weather, ie only in completely dry weather; because the gut string is very sensitive even when there is noticeable humidity or even rain, then fibers and tears very quickly, which is perceived by the players as a very big disadvantage because of the relatively expensive cost price.

Es ist bekannt, daß man durch Kunststoffbeschichtung der Darm­saite versucht hat, den vorgenannten Nachteil zu mindern. Es ist aber ebenso bekannt, daß sich eine dünne Beschichtung sehr schnell abnutzt, eine dickere Beschichtung aber die Eigenschaft der Darmsaite hinsichtlich Elastizität und Ballbeschleunigung stark beeinträchtigt und mindert.It is known that attempts have been made to coat the intestinal string by plastic coating to alleviate the aforementioned disadvantage. It is also known, however, that a thin coating wears out very quickly, but a thicker coating greatly impairs and reduces the property of the gut string with regard to elasticity and ball acceleration.

Weiterhin ist bekannt, daß man versucht hat, den Nachteil der Darmsaite dadurch auszugleichen, daß man einen Stahldraht mit einem Kunststoff ummantelte. Dieser Aufbau hat sich insofern nicht bewährt, als einerseits die Verbindung zwischen Stahldraht und Kunststoffmantel einer hohen Belastung bei der Bespannung nicht standgehalten hat und andererseits bei einer Bespannung mit niedrigerer Belastung die erforderliche Elastizität nicht mehr gegeben war.It is also known that attempts have been made to compensate for the disadvantage of the gut string by sheathing a steel wire with a plastic. This structure has not proven itself in so far as the connection between the steel wire and the plastic sheath has not withstood a high load during the covering and, on the other hand, the required elasticity was no longer given with a covering with a lower load.

Im Gegensatz zur Darmsaite besitzt die Konststoffsaite eine längere Lebensdauer, ist witterungsunabhängig und preislich günstiger, es fehlen aber die Haupteigenschaften, welche eine Tennissaite besitzen soll, nämlich gute Elastizität und hohe Ballbeschleunigung.In contrast to the gut string, the synthetic string has a longer lifespan, is weather-independent and cheaper, but lacks the main properties that a tennis string should have, namely good elasticity and high ball acceleration.

Eine bessere Kombination der genannten erwünschten Eigenschaften ergibt sich nach der DE-OS 31 33 231 dadurch, daß man einen Kern aus verzwirntem Draht- oder Fasermaterial, z. B. aus Stahldraht, Glasfasern oder Kohlenstoffasern, verwendet und mit Kunststoff, insbesondere einem Fluorkohlenstoffharz, beschichtet.A better combination of the desired properties mentioned results from DE-OS 31 33 231 in that a core made of twisted wire or fiber material, for. B. made of steel wire, glass fibers or carbon fibers, and coated with plastic, in particular a fluorocarbon resin.

Der Erfindung liegt die Aufgabe zugrunde, eine Tennissaite der eingangs genannten Art zu entwickeln, die eine noch bessere Kom­bination der erwünschten Eigenschaften, d. h. der Elastizität, der hohen Ballbeschleunigung, der Reißfestigkeit und des Spiel­komforts bei ihrer Verwendung als Tennisschlägerbesaitung, mit einer Witterungsunabhängigkeit und einer mit bisher üblichen Kunststoffsaiten vergleichbaren oder diesen überlegenen Lebensdauer vereinigt, und ein Herstellungsverfahren für diese Tennissaite anzugeben.The invention has for its object to develop a tennis string of the type mentioned that an even better combination of the desired properties, ie. H. the elasticity, the high ball acceleration, the tensile strength and the playing comfort when used as a tennis racket string, with a weather independence and a comparable or superior life expectancy to plastic strings, and to specify a manufacturing process for this tennis string.

Diese Aufgabe wird erfindungsgemäß einerseits dadurch gelöst, daß die Kernfasern aus Aramid "KEVLAR" (R) bestehen.This object is achieved on the one hand in that the core fibers consist of aramid "KEVLAR" (R).

Vorteilhafte Ausgestaltungen sind in den Unteransprüchen 2 bis 7 gekennzeichnet.Advantageous embodiments are characterized in the subclaims 2 to 7.

Gegenstand der Erfindung ist außerdem die aus einer erfin­dungsgemäßen Tennissaite bestehende Tennisschlägerbesaitung.The invention also relates to the tennis racket stringing consisting of a tennis string according to the invention.

Die genannte Aufgabe wird erfindungsgemäß andererseits durch ein Verfahren zur Herstellung der Tennissaite mit dem Kenn­zeichen gelöst, daß ein elastischer Kern aus unverzwirnten oder verzwirnten, z.B. geflochtenen Aramidfasern durch Extrudieren beschichtet wird.On the other hand, the stated object is achieved according to the invention by a method for producing the tennis string with the characteristic that an elastic core made of untwisted or twisted, e.g. braided aramid fibers is coated by extrusion.

Eine vorteilhafte Ausgestaltung dieses Verfahrens ist im Unteranspruch 10 gekennzeichnet.An advantageous embodiment of this method is characterized in subclaim 10.

Die angestrebte Kombination der erwünschten Eigenschaften ist den "KEVLAR"-Aramidfasern als Kernmaterial zuzuschreiben.The desired combination of the desired properties can be attributed to the "KEVLAR" aramid fibers as the core material.

Die Beschichtung kann auf den aus unverzwirnten oder ver­zwirnten Aramidfasern bestehenden Kern statt durch Extrudieren auch durch ein Imprägnier- oder Tauchverfahren aufgebracht werden.The coating can also be applied to the core consisting of untwisted or twisted aramid fibers instead of by extrusion by an impregnation or immersion process.

Die Erfindung wird anhand eines in der Zeichnung veranschau­lichten Ausführungsbeispiels näher erläutert; darin zeigen:

  • Fig. 1 einen Querschnitt einer Tennissaite in vergrößertem Maßstab und
  • Fig. 2 eine Tennisschlägerbesaitung aus einer Tennissaite nach Fig. 1.
The invention is explained in more detail using an exemplary embodiment illustrated in the drawing; show in it:
  • Fig. 1 shows a cross section of a tennis string on an enlarged scale and
  • 2 shows a tennis racket stringing from a tennis string according to FIG. 1.

Man erkennt in Fig. 1 eine Tennissaite 1, die aus einem Kern 2 von etwa 1,1 mm Durchmesser und einer Beschichtung 3 von etwa 0,15 mm Dicke zusammengesetzt ist, so daß der Gesamtdurch­messer etwa 1,4 mm beträgt. Es können auch davon abweichende Abmessungen verwendet werden. Der Kern 2 besteht aus einer großen Zahl haarfeiner, verzwirnter, z.B. etwa 10 000 gefloch­tener "KEVLAR"-Aramidfasern, und die Beschichtung 3 besteht beispielsweise aus einem durch Extrudieren bei etwa 360° C aufgebrachten Fluorkohlenstoffharz, insbesondere Polytetra­fluorethylen oder Fluorethylenpropylen oder einem Copolymeren aus Ethylen und Tetrafluorethylen mit glatter Oberfläche. Diese Tennissaite weist eine Reißfestigkeit von 120 kg (1177 N) bei geringer Bruchdehnung sowie guter Ermüdungsbeständig­keit, Vibrationsdämpfung und Schlagzähigkeit auf.1 shows a tennis string 1 , which is composed of a core 2 of approximately 1.1 mm in diameter and a coating 3 of approximately 0.15 mm in thickness, so that the overall diameter is approximately 1.4 mm. Different dimensions can also be used. The core 2 consists of a large number of hair-fine, twisted, for example approximately 10,000 braided "KEVLAR" aramid fibers, and the coating 3 consists, for example, of a fluorocarbon resin applied by extrusion at approximately 360 ° C., in particular polytetrafluoroethylene or fluoroethylene propylene or a copolymer of ethylene and tetrafluoroethylene with a smooth surface. This tennis string has a tensile strength of 120 kg (1177 N) with low elongation at break as well as good fatigue resistance, vibration damping and impact resistance.

Statt der genannten Beschichtung können auch Beschichtungen aus Polyester-, Polyamid- oder Polyurethanmaterial oder einer Mischung von Kohlenstoff und einem organischen Bindemittel verwendet werden.Instead of the coating mentioned, coatings made of polyester, polyamide or polyurethane material or a mixture of carbon and an organic binder can also be used.

Fig. 2 zeigt einen Tennisschlägerrahmen R mit der erfindungs­gemäßen Besaitung aus der Tennissaite 1 nach Fig. 1.FIG. 2 shows a tennis racket frame R with the stringing according to the invention from the tennis string 1 according to FIG. 1.

Claims (10)

1. Tennissaite aus einem beschichteten elastischen Kern aus unverzwirnten oder verzwirnten Kunststoffasern,
dadurch gekennzeichnet,
daß die Kernfasern (2) aus Aramid "KEVLAR" (R) bestehen.1. tennis string made of a coated elastic core made of untwisted or twisted synthetic fibers,
characterized,
that the core fibers (2) consist of aramid "KEVLAR" (R). 2. Tennissaite nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (2) mit Fluorkohlenstoffharz, insbesondere Poly­tetrafluorethylen oder Fluorethylenpropylen oder einem Copolymeren aus Ethylen und Tetrafluorethylen, beschichtet ist.2. tennis string according to claim 1, characterized in that the core (2) with fluorocarbon resin, in particular polytetrafluoroethylene or fluoroethylene propylene or a copolymer of ethylene and tetrafluoroethylene, is coated. 3. Tennissaite nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (2) mit Polyestermaterial beschichtet ist.3. tennis string according to claim 1, characterized in that the core (2) is coated with polyester material. 4. Tennissaite nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (2) mit Polyamidmaterial beschichtet ist.4. tennis string according to claim 1, characterized in that the core (2) is coated with polyamide material. 5. Tennissaite nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (2) mit Polyurethanmaterial beschichtet ist.5. tennis string according to claim 1, characterized in that the core (2) is coated with polyurethane material. 6. Tennissaite nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (2) mit einer Mischung von Kohlenstoff und einem organischen Bindemittel beschichtet ist.6. tennis string according to claim 1, characterized in that the core (2) is coated with a mixture of carbon and an organic binder. 7. Tennissaite nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Kern (2) einen Durchmesser von 1,1 mm aufweist und die Dicke der Beschichtung (3) 0,15 mm ist.7. tennis string according to one of claims 1 to 6, characterized in that the core (2) has a diameter of 1.1 mm and the thickness of the coating (3) is 0.15 mm. 8. Tennisschlägerbesaitung, dadurch gekennzeichnet, daß sie aus einer Tennissaite (1) nach einem der Ansprüche 1 bis 7 besteht.8. tennis racket stringing, characterized in that it consists of a tennis string ( 1 ) according to any one of claims 1 to 7. 9. Verfahren zur Herstellung einer Tennissaite nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß ein elastischer Kern aus unverzwirnten oder verzwirnten, z.B. geflochtenen Aramidfasern durch Extrudieren beschichtet wird.9. A method for producing a tennis string according to any one of claims 1 to 7, characterized in that an elastic core made of untwisted or twisted, e.g. braided aramid fibers is coated by extrusion. 10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß eine Beschichtung mit Fluorkohlenstoffharz, insbesondere Polytetrafluorethylen oder Fluorethylenpropylen oder einem Copolymeren aus Ethylen und Tetrafluorethylen, durch Extru­dieren bei einer Temperatur in der Größenordnung von 360° C erfolgt.10. The method according to claim 9, characterized in that a coating with fluorocarbon resin, in particular polytetrafluoroethylene or fluoroethylene propylene or a copolymer of ethylene and tetrafluoroethylene, is carried out by extrusion at a temperature in the order of 360 ° C.
EP87111544A 1986-08-11 1987-08-10 Tennis string, tennis racket stringing made of it and method of making the tennis string Withdrawn EP0257424A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19868621534 DE8621534U1 (en) 1986-08-11 1986-08-11 Tennis string and tennis racket stringing made from it
DE8621534U 1986-08-11

Publications (2)

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EP0257424A2 true EP0257424A2 (en) 1988-03-02
EP0257424A3 EP0257424A3 (en) 1988-07-20

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EP87111544A Withdrawn EP0257424A3 (en) 1986-08-11 1987-08-10 Tennis string, tennis racket stringing made of it and method of making the tennis string

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DE (1) DE8621534U1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640149A1 (en) * 1988-12-14 1990-06-15 Cousin Freres Sa SYNTHETIC ROPE OF TENNIS OR THE LIKE AND METHOD OF MANUFACTURING THE SAME
WO1993008880A1 (en) * 1991-11-07 1993-05-13 Ferrari Importing Co Sports racquet with hybrid stringing arrangement
US6634968B2 (en) * 2000-09-29 2003-10-21 Peter Yeh String for a racket
US6835454B1 (en) 1999-08-24 2004-12-28 Stuart Karl Randa Fluoropolymer modification of strings for stringed sports equipment and musical instruments

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301167C2 (en) * 1993-01-20 2001-04-19 Horst Kirschbaum String for stringing ball game rackets

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1101384A (en) * 1963-10-18 1968-01-31 Dunlop Rubber Co Improvements relating to cords
FR2356762A1 (en) * 1976-06-29 1978-01-27 Robin Jacques Musical instrument or sports racquet strings - formed from tows of multifilaments impregnated with thermosetting resin which is partially polymerised before twisting string
GB1531652A (en) * 1977-01-22 1978-11-08 Ashaway Line & Twine Mfg String construction and method of making same
DE3133231A1 (en) * 1981-08-21 1983-03-10 Otto 8000 München Schwertl Tennis string, its production and use for stringing a tennis racket
GB2126614A (en) * 1982-09-02 1984-03-28 Explosifs Prod Chim Racket string

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1101384A (en) * 1963-10-18 1968-01-31 Dunlop Rubber Co Improvements relating to cords
FR2356762A1 (en) * 1976-06-29 1978-01-27 Robin Jacques Musical instrument or sports racquet strings - formed from tows of multifilaments impregnated with thermosetting resin which is partially polymerised before twisting string
GB1531652A (en) * 1977-01-22 1978-11-08 Ashaway Line & Twine Mfg String construction and method of making same
DE3133231A1 (en) * 1981-08-21 1983-03-10 Otto 8000 München Schwertl Tennis string, its production and use for stringing a tennis racket
GB2126614A (en) * 1982-09-02 1984-03-28 Explosifs Prod Chim Racket string

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640149A1 (en) * 1988-12-14 1990-06-15 Cousin Freres Sa SYNTHETIC ROPE OF TENNIS OR THE LIKE AND METHOD OF MANUFACTURING THE SAME
EP0377362A1 (en) * 1988-12-14 1990-07-11 Cousin Freres S.A. Synthetic tennis string or the like, and method of making the same
WO1993008880A1 (en) * 1991-11-07 1993-05-13 Ferrari Importing Co Sports racquet with hybrid stringing arrangement
US6835454B1 (en) 1999-08-24 2004-12-28 Stuart Karl Randa Fluoropolymer modification of strings for stringed sports equipment and musical instruments
US6634968B2 (en) * 2000-09-29 2003-10-21 Peter Yeh String for a racket

Also Published As

Publication number Publication date
EP0257424A3 (en) 1988-07-20
DE8621534U1 (en) 1987-01-15

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