EP1280586B1 - Composite synthetic string for tennis racket - Google Patents

Composite synthetic string for tennis racket Download PDF

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Publication number
EP1280586B1
EP1280586B1 EP01931801A EP01931801A EP1280586B1 EP 1280586 B1 EP1280586 B1 EP 1280586B1 EP 01931801 A EP01931801 A EP 01931801A EP 01931801 A EP01931801 A EP 01931801A EP 1280586 B1 EP1280586 B1 EP 1280586B1
Authority
EP
European Patent Office
Prior art keywords
binder
monofilaments
rope
yarns
polyurethane
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.)
Expired - Lifetime
Application number
EP01931801A
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German (de)
French (fr)
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EP1280586A1 (en
Inventor
Yves Delvael
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.)
Cousin Biotech SAS
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Cousin Biotech SAS
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Filing date
Publication date
Application filed by Cousin Biotech SAS filed Critical Cousin Biotech SAS
Publication of EP1280586A1 publication Critical patent/EP1280586A1/en
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Publication of EP1280586B1 publication Critical patent/EP1280586B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
    • 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 present invention relates to a composite synthetic rope, intended in particular, but not exclusively, tennis racket string.
  • FR-A-2,770,140 a two-component synthetic rope is described: multifilament yarns of polyamide and polyurethane, the multifilaments being integrated in a polyurethane matrix.
  • the polyurethane binder whose elastic behavior is much greater than that of polyamide, makes it possible to obtain, with a particular structure of the rope, a high tensile strength and an average hardness resulting in a rapid return of the rope in its initial position after the impact of a bullet.
  • the present invention aims to use this advantage and greatly extend the life of tennis ropes, even used with rigid frame rackets, with an original appearance.
  • the synthetic composite rope in particular for tennis racket, comprising threads of a first synthetic material and a binder made of a second synthetic material impregnating at heart, joining and covering said spirally wound threads, the point of fusion of the binder being lower than that of the yarns and its much higher elasticity, said yarns being made of multifilaments, is characterized in that at least one monofilament with two flat sides is arranged at the center of the cord, the latter being bent under traction, after its formation, causing delamination.
  • the rope is characterized in that the oblong monofilament appears as a contrasted spiral through the transparent binder.
  • a single flat monofilament flat wire is sufficient to achieve the desired effect.
  • the central monofilament or monofilaments are elongated monofilaments with very high tenacity, whose section is of generally rectangular shape with rounded edges. They are in a way a soul of the rope. We can also provide some small monofilaments disposed at the periphery of the rope to resist abrasion.
  • the central monofilament (or a bundle of multifilaments) can be colored to enhance the iridescent light effect. It is also possible to stain the polyurethane or binder in the mass.
  • the rope according to the invention is composed of polyurethane 1, forming the matrix of the rope and impregnating and surrounding multifilaments and monofilaments.
  • the polyurethane is between the multifilaments 2, and the central monofilaments 3 thus constitutes a homogeneous whole. It is also the bark 4 or outer shell layer of the rope.
  • oblong monofilaments 3 which, in the example shown, are two in number. But in all cases, monofilaments 3 are secured with the multifilaments 2 by the polyurethane matrix.
  • Monofilaments 3 also support the dynamic work of the rope.
  • the rope according to the invention furthermore stiffened by the presence of monofilaments, is easier to string.
  • the multifilaments 2, as well as the monofilaments 3, consist of polyamide known under the designation "nylon 6.6", whose shore hardness "D” is 85, or other polyamides and copolyamides.
  • the method of manufacturing by twisting such a rope is traditional, that is to say it consists in coating monofilaments and multifilaments before twisting and twisting them with a twist rate of 50 to 200 revolutions / meter, the rope being, after twisting and evaporation of the solvent, passed through a die of contour regularization and evacuation of the polyurethane in excess. After that, the tension is exerted on the rope which produces a delamination and causes the central monofilaments to appear through the polyurethane.
  • the multifilament coils, elongated monofilaments and are mounted on a turntable on which the son are coated with a polyurethane solution.
  • the wires pass through an oven that evaporates the solvent and prepolymers the polyurethane.
  • the threads are milled in a ring and the binder is finally polymerized in an oven. After that pull on the wire to achieve the desired effect.
  • the rope can thus be built in one operation and without rework.
  • the bending under tension exerted on the rope causes a delamination which makes that the spiral of the central monofilaments appears like a helix through the transparent polyurethane.
  • the pitch of the spiral is a function of twisting. It has been noted that the strings according to the invention have a sound, when the impact of a ball similar to that of natural gut.
  • the rope shown in FIG. 1 has a diameter of 1.30 mm and has a tensile strength greater than 80 daN. Its elongation of rupture is of the order of 25%, and its mass of 1.5 grams per meter. It consists of two oblong monofilaments of 2,200 decitex which, during twisting, are spirally wound, and four multifilament yarns including 140 filaments each with a diameter of 28 microns. The set of threads is twisted at 80 revolutions / meter.
  • the multifilament and monofilament are polyamide
  • this material can be replaced by any other synthetic material having good dynamic characteristics, such as polyester, for example.
  • the central monofilament son may be of any section provided to have two flat sides so that the contact between the two son can be done on a non-point surface.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Reinforced Plastic Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Passenger Equipment (AREA)
  • Artificial Fish Reefs (AREA)

Abstract

The invention concerns a composite synthetic delaminated string in particular for a tennis racket. The string includes central monofilaments surrounded by multifilament yarns, the assembly being impregnated and coated with polyurethane and is subjected to tensile bending after it has been formed. The invention is useful for tennis strings with novel appearance, with long life span and quick reaction when hitting a ball.

Description

La présente invention a pour objet une corde synthétique composite, destinée en particulier, mais non exclusivement, au cordage de raquettes de tennis.The present invention relates to a composite synthetic rope, intended in particular, but not exclusively, tennis racket string.

On connaît déjà des cordes synthétiques composites. Dans FR-A-2 770 140, est décrite une corde synthétique à deux composants : des fils multifilaments de polyamide et du polyuréthane, les multifilaments étant intégrés dans une matrice de polyuréthane. Le liant de polyuréthane, dont le comportement élastique est très supérieur à celui du polyamide, permet d'obtenir avec une structure particulière de la corde, une résistance à la rupture élevée et une dureté moyenne se traduisant par un retour rapide de la corde dans sa position initiale après l'impact d'une balle.Composite synthetic ropes are already known. In FR-A-2,770,140, a two-component synthetic rope is described: multifilament yarns of polyamide and polyurethane, the multifilaments being integrated in a polyurethane matrix. The polyurethane binder, whose elastic behavior is much greater than that of polyamide, makes it possible to obtain, with a particular structure of the rope, a high tensile strength and an average hardness resulting in a rapid return of the rope in its initial position after the impact of a bullet.

La présente invention a pour objet d'utiliser cet avantage et d'allonger considérablement la durée de vie des cordages de tennis, même employés avec des raquettes à cadre rigide, en présentant un aspect original.The present invention aims to use this advantage and greatly extend the life of tennis ropes, even used with rigid frame rackets, with an original appearance.

Selon la présente invention, la corde composite synthétique, notamment pour raquette de tennis, comprenant des fils d'une première matière synthétique et un liant en une seconde matière synthétique imprégnant à coeur, réunissant et recouvrant lesdits fils, enroulés en spirale, le point de fusion du liant étant inférieur à celui des fils et son élasticité très supérieure, lesdits fils étant constitués de multifilaments, est caractérisée en ce qu'au moins un monofilament à deux côtés plats est disposé au centre de la corde, celle-ci subissant une flexion sous traction, après sa formation, provoquant un délaminage.According to the present invention, the synthetic composite rope, in particular for tennis racket, comprising threads of a first synthetic material and a binder made of a second synthetic material impregnating at heart, joining and covering said spirally wound threads, the point of fusion of the binder being lower than that of the yarns and its much higher elasticity, said yarns being made of multifilaments, is characterized in that at least one monofilament with two flat sides is arranged at the center of the cord, the latter being bent under traction, after its formation, causing delamination.

Selon une autre caractéristique de l'invention, la corde est caractérisée en ce que le monofilament oblong apparaît comme une spirale contrastée à travers le liant transparent.According to another characteristic of the invention, the rope is characterized in that the oblong monofilament appears as a contrasted spiral through the transparent binder.

Un seul fil monofilament central plat est suffisant pour obtenir l'effet désiré. De préférence, le ou les monofilaments centraux sont des monofilaments oblongs à très haute ténacité, dont la section est de forme générale rectangulaire à bords arrondis. Ils constituent en quelque sorte une âme de la corde. On peut également prévoir quelques petits monofilaments disposés à la périphérie de la corde pour résister à l'abrasion. Le monofilament central (ou un faisceau de multifilaments) peut être coloré pour accroître l'effet lumineux d'irisation. Il est également possible de colorer le polyuréthane ou liant dans la masse.A single flat monofilament flat wire is sufficient to achieve the desired effect. Preferably, the central monofilament or monofilaments are elongated monofilaments with very high tenacity, whose section is of generally rectangular shape with rounded edges. They are in a way a soul of the rope. We can also provide some small monofilaments disposed at the periphery of the rope to resist abrasion. The central monofilament (or a bundle of multifilaments) can be colored to enhance the iridescent light effect. It is also possible to stain the polyurethane or binder in the mass.

D'autres caractéristiques et avantages de l'invention apparaitront au cours de la description qui va suivre d'un mode particulier de réalisation, donné uniquement à titre d'exemple non limitatif, en regard des dessins qui représentent :

  • la figure 1, une section transversale d'une corde selon la présente invention.
  • la figure 2, une vue d'une corde selon l'invention.
Other features and advantages of the invention will become apparent from the following description of a particular embodiment, given solely by way of non-limiting example, with reference to the drawings which represent:
  • Figure 1, a cross section of a rope according to the present invention.
  • Figure 2 is a view of a rope according to the invention.

Sur la figure 1, on voit que la corde selon l'invention est composée de polyuréthane 1, formant la matrice de la corde et imprégnant et entourant les multifilaments et les monofilaments. Le polyuréthane se trouve entre les multifilaments 2, et les monofilaments centraux 3 constitue ainsi un ensemble homogène. Il constitue également l'écorce 4 ou couche enveloppe extérieure de la corde. À l'intérieur de la matrice des multifilaments sont répartis, au centre de la masse de ceux-ci, des monofilaments 3 oblongs qui, dans l'exemple représenté, sont au nombre de deux. Mais dans tous les cas, les monofilaments 3 sont solidarisés avec les multifilaments 2 par la matrice de polyuréthane.In Figure 1, we see that the rope according to the invention is composed of polyurethane 1, forming the matrix of the rope and impregnating and surrounding multifilaments and monofilaments. The polyurethane is between the multifilaments 2, and the central monofilaments 3 thus constitutes a homogeneous whole. It is also the bark 4 or outer shell layer of the rope. Inside the matrix of the multifilaments are distributed, in the center of the mass thereof, oblong monofilaments 3 which, in the example shown, are two in number. But in all cases, monofilaments 3 are secured with the multifilaments 2 by the polyurethane matrix.

Les monofilaments 3 prennent également en charge le travail dynamique de la corde. La corde selon l'invention, par ailleurs rigidifiée par la présence de monofilaments, est plus facile à corder.
Les multifilaments 2, de même que les monofilaments 3, sont constitués par du polyamide connu sous la désignation "nylon 6.6", dont la dureté shore "D" est de 85, ou autres polyamides et copolyamides.Monofilaments 3 also support the dynamic work of the rope. The rope according to the invention, furthermore stiffened by the presence of monofilaments, is easier to string.
The multifilaments 2, as well as the monofilaments 3, consist of polyamide known under the designation "nylon 6.6", whose shore hardness "D" is 85, or other polyamides and copolyamides.

Le procédé de fabrication par retordage d'une telle corde est classique c'est-à-dire qu'il consiste à enduire des monofilaments et des multifilaments avant retordage puis de les retordre avec un taux de torsion de 50 à 200 tours/mètre, la corde étant, après retordage et évaporation du solvant, passée à travers une filière de régularisation de contour et d'évacuation du polyuréthane en excès. Après quoi, on exerce une flexion sous tension sur la corde ce qui produit une délamination et fait apparaître les monofilaments centraux à travers le polyuréthane.The method of manufacturing by twisting such a rope is traditional, that is to say it consists in coating monofilaments and multifilaments before twisting and twisting them with a twist rate of 50 to 200 revolutions / meter, the rope being, after twisting and evaporation of the solvent, passed through a die of contour regularization and evacuation of the polyurethane in excess. After that, the tension is exerted on the rope which produces a delamination and causes the central monofilaments to appear through the polyurethane.

Les bobines de multifilaments, de monofilaments oblongs et sont montées sur un plateau tournant sur lequel les fils sont enduits par une solution de polyuréthane. Les fils passent dans un four qui évapore le solvant et pré polymérise le polyuréthane. Puis les fils sont moulinés dans un anneau et le liant est définitivement polymérisé dans un four. Après quoi on exerce une traction sur le fil pour obtenir l'effet désiré. La corde peut ainsi être construite en une seule opération et sans reprises.The multifilament coils, elongated monofilaments and are mounted on a turntable on which the son are coated with a polyurethane solution. The wires pass through an oven that evaporates the solvent and prepolymers the polyurethane. Then the threads are milled in a ring and the binder is finally polymerized in an oven. After that pull on the wire to achieve the desired effect. The rope can thus be built in one operation and without rework.

La flexion sous traction exercée sur la corde, par exemple au moyen d'un cabestan, ou par passage sur un axe ou dans une filière serrante, provoque un délaminage qui fait que la spirale des monofilaments centraux apparaît comme une hélice à travers le polyuréthane transparent. Le pas de la spirale est fonction du retordage.
On a remarqué que les cordes selon l'invention présentaient un son, lors de l'impact d'une balle analogue à celui du boyau naturel.The bending under tension exerted on the rope, for example by means of a capstan, or by passing on an axis or in a tightening die, causes a delamination which makes that the spiral of the central monofilaments appears like a helix through the transparent polyurethane. The pitch of the spiral is a function of twisting.
It has been noted that the strings according to the invention have a sound, when the impact of a ball similar to that of natural gut.

EXEMPLE :EXAMPLE:

La corde représentée sur la figure 1 est d'un diamètre de 1,30mm et présente une résistance à la rupture supérieure à 80 daN. Son allongement de rupture est de l'ordre de 25 %, et sa masse de 1,5 gramme par mètre. Elle se compose de deux monofilaments oblongs de 2.200 décitex qui, au cours du retordage sont enroulés en spirale, et de quatre fils multifilaments incluant 140 filaments chacun dont le diamètre est de 28 microns. L'ensemble des fils est retordu à raison de 80 tours/mètre.The rope shown in FIG. 1 has a diameter of 1.30 mm and has a tensile strength greater than 80 daN. Its elongation of rupture is of the order of 25%, and its mass of 1.5 grams per meter. It consists of two oblong monofilaments of 2,200 decitex which, during twisting, are spirally wound, and four multifilament yarns including 140 filaments each with a diameter of 28 microns. The set of threads is twisted at 80 revolutions / meter.

Bien que, dans la description qui précède, les multifilaments et les monofilaments soient en polyamide, cette matière peut être remplacée par toute autre matière synthétique présentant de bonnes caractéristiques dynamiques, telle que du polyester, par exemple. Les fils monofilaments centraux peuvent être de section quelconque à condition de présenter deux côtés plats de manière à ce que le contact entre les deux fils puisse se faire sur une surface non ponctuelle.Although, in the above description, the multifilament and monofilament are polyamide, this material can be replaced by any other synthetic material having good dynamic characteristics, such as polyester, for example. The central monofilament son may be of any section provided to have two flat sides so that the contact between the two son can be done on a non-point surface.

Il va de soi que de nombreuses variantes peuvent être apportées, notamment par substitution de moyens techniquement équivalents sans pour autant sortir du cadre de l'invention, qui est definie dans les revendications.It goes without saying that many variants can be made, in particular by substitution of technically equivalent means without departing from the scope of the invention, which is defined in the claims.

Claims (3)

  1. A synthetic composite cord, notably for tennis rackets, comprising yarns (2) of a first synthetic material and a binder (1) in a second core impregnating synthetic material, combining together and covering said spirally wound yarns, the melting point of the binder being less than that of the yarns and its elasticity much larger, said yards consisting of multifilaments, at least one monofilament (3) having two flat sides and positioned at the centre of the cord, characterized in that the cord is delaminated from tensile flexure.
  2. The composite cord according to claim 1, characterized in that the oblong monofilament (3) appears as a contrasted spiral through the transparent binder and the multifilaments (2).
  3. The composite cord according to any of claims 1 or 2, characterized in that the monofilaments (3) and the multifilament yarns (2) are in polyamide, the binder consisting of polyurethane.
EP01931801A 2000-05-09 2001-05-04 Composite synthetic string for tennis racket Expired - Lifetime EP1280586B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0005848A FR2808697B1 (en) 2000-05-09 2000-05-09 COMPOSITE SYNTHETIC ROPE FOR TENNIS RACQUET
FR0005848 2000-05-09
PCT/FR2001/001371 WO2001085268A1 (en) 2000-05-09 2001-05-04 Composite synthetic string for tennis racket

Publications (2)

Publication Number Publication Date
EP1280586A1 EP1280586A1 (en) 2003-02-05
EP1280586B1 true EP1280586B1 (en) 2006-12-06

Family

ID=8849993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01931801A Expired - Lifetime EP1280586B1 (en) 2000-05-09 2001-05-04 Composite synthetic string for tennis racket

Country Status (7)

Country Link
US (1) US6978593B2 (en)
EP (1) EP1280586B1 (en)
JP (1) JP2003532506A (en)
AT (1) ATE347411T1 (en)
DE (1) DE60125028D1 (en)
FR (1) FR2808697B1 (en)
WO (1) WO2001085268A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2006335800B2 (en) * 2006-01-23 2012-06-14 Yoz-Ami Corporation Colored yarn object, process for producing the same, and fishing line
US20080124546A1 (en) * 2006-11-16 2008-05-29 Nano-Proprietary, Inc. Buffer Layer for Strings
US8713906B2 (en) 2006-11-16 2014-05-06 Applied Nanotech Holdings, Inc. Composite coating for strings
US20080206559A1 (en) * 2007-02-26 2008-08-28 Yunjun Li Lubricant enhanced nanocomposites
FR2934958B1 (en) * 2008-08-12 2012-11-09 Babolat Vs ROPE FOR RACKETS, IN PARTICULAR FOR TENNIS RACKETS
BE1018246A3 (en) * 2008-08-14 2010-07-06 Luxilon Ind Nv SYNTHETIC STRAP.
JP6525638B2 (en) * 2015-02-26 2019-06-05 キヤノン株式会社 Recording method, recorded matter, processing method of recorded matter, and method for improving crack resistance of recorded matter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048078A (en) * 1960-04-29 1962-08-07 Kaplan Philip Method of producing extensible electric cables
US3371476A (en) * 1965-04-02 1968-03-05 Gen Motors Corp Glass plastic rope
US4055941A (en) * 1976-12-09 1977-11-01 E. I. Du Pont De Nemours And Company Integrated string
FR2491098B1 (en) 1980-09-26 1983-05-27 Cousin Freres Sa
FR2581094B1 (en) * 1985-04-29 1987-09-11 Michelin & Cie REINFORCEMENT ASSEMBLY WITH A CORE CONSTITUTED BY A SHAPE WIRE; ARTICLES COMPRISING SUCH ASSEMBLIES
US5145172A (en) * 1989-05-05 1992-09-08 Gosen Co., Ltd. String for racket
FR2770140B1 (en) * 1997-10-23 2002-09-27 Cousin Biotech COMPOSITE SYNTHETIC ROPE FOR TENNIS RACQUET

Also Published As

Publication number Publication date
FR2808697B1 (en) 2002-10-11
US6978593B2 (en) 2005-12-27
US20030145574A1 (en) 2003-08-07
FR2808697A1 (en) 2001-11-16
DE60125028D1 (en) 2007-01-18
EP1280586A1 (en) 2003-02-05
JP2003532506A (en) 2003-11-05
ATE347411T1 (en) 2006-12-15
WO2001085268A1 (en) 2001-11-15

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