EP0213053B1 - Natural intestines provided with a protection against humidity, especially for tennis racket strings - Google Patents

Natural intestines provided with a protection against humidity, especially for tennis racket strings Download PDF

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Publication number
EP0213053B1
EP0213053B1 EP86440062A EP86440062A EP0213053B1 EP 0213053 B1 EP0213053 B1 EP 0213053B1 EP 86440062 A EP86440062 A EP 86440062A EP 86440062 A EP86440062 A EP 86440062A EP 0213053 B1 EP0213053 B1 EP 0213053B1
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EP
European Patent Office
Prior art keywords
solution
protection against
pearly pigment
hardener
layers
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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
EP86440062A
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German (de)
French (fr)
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EP0213053A1 (en
Inventor
Pierre Chouissa
Rémi Chouissa
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.)
BOYAUDERIE DE L'EST SA
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BOYAUDERIE DE L'EST SA
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Priority to AT86440062T priority Critical patent/ATE54575T1/en
Publication of EP0213053A1 publication Critical patent/EP0213053A1/en
Application granted granted Critical
Publication of EP0213053B1 publication Critical patent/EP0213053B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 present invention relates to the field of the manufacture of natural casings, in particular for strings of tennis rackets, and relates to natural casings having protection against moisture.
  • Document EP-A-83 824 discloses a natural hose, in particular for coding tennis rackets, which is provided with protection against humidity in the form of an adhesive layer.
  • the present invention aims to overcome these drawbacks.
  • the object of natural casings in particular for coding tennis rackets, provided with protection against humidity in the form of an adhesive layer, characterized in that the adhesive layer is formed from '' a dispersion of vinyl acetate in water and that the protection against humidity comprises one or more layers each formed from a mixture of a varnish-hardener-diluent solution with a pearlescent pigment, said pigment pearlescent being based on mica coated with titanium dioxide and having a very fine particle size.
  • the adhesive layer 1 is formed from a dispersion of vinyl acetate in water and the protection against humidity comprises one or more layers 2, 2 'and 2 "each formed at starting from a mixture of a varnish-hardener-diluent solution with a pearlescent pigment, said pearlescent pigment being based on mica coated with titanium dioxide and having a very fine particle size.
  • the protection against humidity is made up of the adhesive layer 1 allowing the additional layers to better adhere to the rope 3, and three other identical layers 2, 2 ′ and 2 " , so as to obtain a very effective protection against humidity.
  • the pearlescent pigment used is advantageously that known under the trade name Iriodine 110 Perle Fine from the company Merck. This pigment is very resistant to acids, alkalis and is insensitive to light and heat. It is practically insoluble and remains in suspension in the polyurethane mixture. In addition, and in a completely unexpected way, this pearlescent pigment does not only confer a pearlescent effect, in this case a matt pearlescent effect of silver color, but also a high covering power thanks to its very fine particle size, of less than 15 microns.
  • the pearlescent pigment flakes are oriented parallel to each other like roof tiles, providing a perfectly waterproof layer.
  • the varnish-hardener mixture corresponds to a polyurethane product forming a macromolecular chain of prepolymer. This mixture makes it possible to obtain a layer of varnish which is both hard and flexible and can be folded without cracking. The diluent, meanwhile, provides sufficient fluidity for the application of the mixture by sponges.
  • the pearlescent pigment must be added to the solution by a mixture carried out, for example manually, non-abruptly until saturation, so that the glitter of said varnish remains intact and is oriented parallel to each other so as to create a seal. perfect.
  • High speed mixers for example, are absolutely unsuitable because the flakes of pearlescent pigment must remain intact.
  • the alignment of intact flakes in the varnish-hardener mixture forming a macromolecular chain of prepolymer prevents any moisture from entering the ropes 3.
  • the solution forming the layer 1 advantageously contains approximately 20% of vinyl acetate and 80% of water.
  • the solution forming the layers 2, 2 ', 2 "advantageously contains approximately 50% of varnish, 40% of hardener and 10% of solvent, the quantity of pearlescent pigment to be added being approximately 40 g per liter of solution.

Abstract

1. Natural intestines, in particular for tennis racket strings provided with protection against humidity in the form of an adhesive layer (1), characterised in that the adhesive layer (1) is formed from a dispersion of vinyl acetate in water and in that the protection against humidity comprises one or more layers (2, 2' and 2") each formed from a mixture of a lacquer/hardener/diluent solution with a pearly pigment, said pearly pigment being based on mica coated with titanium dioxide and having a very fine grain size.

Description

La présente invention concerne le domaine de la fabrication de boyaux naturels, notamment pour cordages de raquettes de tennis, et a pour objet des boyaux naturels présentant une protection contre l'humidité.The present invention relates to the field of the manufacture of natural casings, in particular for strings of tennis rackets, and relates to natural casings having protection against moisture.

Actuellement, les boyaux naturels non plastifiés n'offrent pas de protection contre l'humidité, qui pénètre directement dans les fibres des boyaux. Il existe également des boyaux naturels avec protection plastifiée, mais seule une partie de l'humidité est absorbée par la protection plastifiée, et le reste de l'humidité pénétrant à l'intérieur des boyaux.Currently, unplasticized natural casings do not offer protection against moisture, which penetrates directly into the fibers of the casings. There are also natural casings with plastic protection, but only part of the moisture is absorbed by the plastic protection, and the rest of the moisture penetrates inside the casings.

Le document EP-A-83 824 divulgue un boyau naturel, notamment pour codages de raquettes de tennis, qui est muni d'une protection contre l'humidité sous la forme d'une couche adhésive.Document EP-A-83 824 discloses a natural hose, in particular for coding tennis rackets, which is provided with protection against humidity in the form of an adhesive layer.

Quant au document TENNIS n° 4 du 02.02.1979, page 16, il divulgue un boyau naturel pigmenté et muni d'un vernis de polyuréthane.As for the TENNIS document n ° 4 dated 02.02.1979, page 16, it discloses a natural pigmented hose fitted with a polyurethane varnish.

La présente invention a pour but de pallier ces inconvénients.The present invention aims to overcome these drawbacks.

Elle a, en effet, pour objet des boyaux naturels, notamment pour codages de raquettes de tennis, munis d'une protection contre l'humidité sous la forme d'une couche adhésive, caractérisés en ce que la couche adhésive est formée à partir d'une dispersion d'acétate de vinyle dans de l'eau et que la protection contre l'humidité comporte une ou plusieurs couches formées chacune à partir d'un mélange d'une solution vernis-durcisseur-diluant avec un pigment nacrant, ledit pigment nacrant étant à base de mica enrobé de dioxyde de titane et présentant une très fine granulométrie.It has, in fact, the object of natural casings, in particular for coding tennis rackets, provided with protection against humidity in the form of an adhesive layer, characterized in that the adhesive layer is formed from '' a dispersion of vinyl acetate in water and that the protection against humidity comprises one or more layers each formed from a mixture of a varnish-hardener-diluent solution with a pearlescent pigment, said pigment pearlescent being based on mica coated with titanium dioxide and having a very fine particle size.

L'invention sera mieux comprise, grâce à la description ci-après, d'un mode de réalisation préféré, donné à titre d'exemple non limitatif et expliqué avec référence au dessin schématique annexé, dont la figure unique est une vue en coupe d'un boyau naturel conforme à l'invention.The invention will be better understood, thanks to the description below, of a preferred embodiment, given by way of nonlimiting example and explained with reference to the appended schematic drawing, the single figure of which is a sectional view of 'A natural casing according to the invention.

Conformément à l'invention, la couche adhésive 1 est formée à partir d'une dispersion d'acétate de vinyle dans de l'eau et la protection contre l'humidité comporte une ou plusieurs couches 2, 2' et 2" formées chacune à partir d'un mélange d'une solution vernis-durcisseur-diluant avec un pigment nacrant, ledit pigment nacrant étant à base de mica enrobé de dioxyde de titane et présentant une très fine granulométrie.According to the invention, the adhesive layer 1 is formed from a dispersion of vinyl acetate in water and the protection against humidity comprises one or more layers 2, 2 'and 2 "each formed at starting from a mixture of a varnish-hardener-diluent solution with a pearlescent pigment, said pearlescent pigment being based on mica coated with titanium dioxide and having a very fine particle size.

Dans l'exemple de réalisation représentée à la figure annexée, la protection contre l'humidité est composée par la couche adhésive 1 permettant aux couches supplémentaires de mieux adhérer sur le cordage 3, et de trois autres couches identiques 2, 2' et 2", de manière à obtenir une protection très efficace contre l'humidité.In the embodiment shown in the appended figure, the protection against humidity is made up of the adhesive layer 1 allowing the additional layers to better adhere to the rope 3, and three other identical layers 2, 2 ′ and 2 " , so as to obtain a very effective protection against humidity.

Le pigment nacrant utilisé est avantageusement celui connu sous la dénomination commerciale Iriodine 110 Perle Fine de la société Merck. Ce pigment est très résistant aux acides, aux alcalins et est insensible à la lumière et à la chaleur. Il est pratiquement insoluble et reste en suspension dans le mélange polyuréthanne. De plus, et d'une manière totalement inattendue, ce pigment nacrant ne confère pas uniquement un effet nacré, en l'occurrence un effet nacré mat de couleur argentée, mais également un pouvoir couvrant élevé grâce à sa très fine granulométrie, de moins de 15 microns. Les paillettes du pigment nacrant s'orientent parallèlement les unes par rapport aux autres à la façon des tuiles d'un toit, offrant ainsi une couche parfaitement étanche.The pearlescent pigment used is advantageously that known under the trade name Iriodine 110 Perle Fine from the company Merck. This pigment is very resistant to acids, alkalis and is insensitive to light and heat. It is practically insoluble and remains in suspension in the polyurethane mixture. In addition, and in a completely unexpected way, this pearlescent pigment does not only confer a pearlescent effect, in this case a matt pearlescent effect of silver color, but also a high covering power thanks to its very fine particle size, of less than 15 microns. The pearlescent pigment flakes are oriented parallel to each other like roof tiles, providing a perfectly waterproof layer.

L'invention a également pour objet un procédé de plastification des boyaux naturels conformes à l'invention, qui consiste:

  • - à lisser par dessus et par dessous les cordages 3 tendus sur des chevilles entre deux métiers, à l'aide d'une éponge imbibée d'une solution d'acétate de vinyle et d'eau formant la couche adhésive 1;
  • - à laisser sécher ladite couche 1 durant au minimum 30 minutes;
  • - à lisser par dessus et par dessous les cordages tendus 3 tendus, à l'aide d'une éponge imbibée d'une solution, formant la couche 2, ladite solution étant obtenue par mélange d'un vernis et d'un durcisseur auquel on ajoute un diluant, ainsi que le pigment nacrant, ce dernier devant être rajouté à la solution par un mélange effectué de façon non brutale;
  • - à renouveler, le cas échéant, cette opération jusqu'à obtention du nombre de couches désirées, à intervalle de temps d'au minimum 30 minutes, un tel intervalle de temps permettant le séchage préalable de la couche précédente.
The subject of the invention is also a process for plasticizing natural casings according to the invention, which consists of:
  • - to smooth above and below the ropes 3 stretched on pegs between two looms, using a sponge soaked in a solution of vinyl acetate and water forming the adhesive layer 1;
  • - allow said layer 1 to dry for at least 30 minutes;
  • - to smooth above and below the stretched ropes 3 stretched, using a sponge soaked in a solution, forming layer 2, said solution being obtained by mixing a varnish and a hardener to which add a diluent, as well as the pearlescent pigment, the latter having to be added to the solution by a non-brutal mixture;
  • - To repeat, if necessary, this operation until the desired number of layers is obtained, at a time interval of at least 30 minutes, such a time interval allowing the previous drying of the previous layer.

Le mélange vernis-durcisseur correspond à un produit polyuréthanne formant une chaîne macromoléculaire de prépolymère. Ce mélange permet d'obtenir une couche de vernis à la fois dure et souple pouvant se plier sans craqueler. Le diluant, quant à lui, permet d'obtenir une fluidité suffisante pour l'application du mélange par des éponges.The varnish-hardener mixture corresponds to a polyurethane product forming a macromolecular chain of prepolymer. This mixture makes it possible to obtain a layer of varnish which is both hard and flexible and can be folded without cracking. The diluent, meanwhile, provides sufficient fluidity for the application of the mixture by sponges.

Le pigment nacrant doit être rajouté à la solution par un mélange effectué, par exemple manuellement, de façon non brutale jusqu'à saturation, afin que les paillettes dudit vernis restent intactes et s'orientent parallèlement les unes aux autres de manière à créer une étanchéité parfaite. Des mélangeurs à grande vitesse, par exemple, ne sont absolument pas appropriés car les paillettes du pigment nacrant doivent rester intactes. Ainsi, l'alignement de paillettes intactes dans le mélange vernis-durcisseur formant une chaîne macromoléculaire de prépolymère empêche toute humidité de pénétrer dans les cordages 3.The pearlescent pigment must be added to the solution by a mixture carried out, for example manually, non-abruptly until saturation, so that the glitter of said varnish remains intact and is oriented parallel to each other so as to create a seal. perfect. High speed mixers, for example, are absolutely unsuitable because the flakes of pearlescent pigment must remain intact. Thus, the alignment of intact flakes in the varnish-hardener mixture forming a macromolecular chain of prepolymer prevents any moisture from entering the ropes 3.

Selon une caractéristique de l'invention, la solution formant la couche 1 contient avantageusement environ 20% d'acétate de vinyle et 80% d'eau.According to a characteristic of the invention, the solution forming the layer 1 advantageously contains approximately 20% of vinyl acetate and 80% of water.

Selon une autre caractéristique de l'invention, la solution formant les couches 2, 2', 2" contient avantageusement environ 50% de vernis, 40% de durcisseur et 10% de solvant, la quantité de pigment nacrant à ajouter étant environ de 40 g par litre de solution.According to another characteristic of the invention, the solution forming the layers 2, 2 ', 2 "advantageously contains approximately 50% of varnish, 40% of hardener and 10% of solvent, the quantity of pearlescent pigment to be added being approximately 40 g per liter of solution.

Claims (5)

1. Natural intestines, in particular for tennis racket strings provided with protection against humidity in the form of an adhesive layer (1), characterised in that the adhesive layer (1) is formed from a dispersion of vinyl acetate in water and in that the protection against humidity comprises one or more layers (2, 2' and 2") each formed from a mixture of a lacquer/hardener/ diluent solution with a pearly pigment, said pearly pigment being based on mica coated with titanium dioxide and having a very fine grain size.
2. Natural intestines according to claim 1, characterised in that they comprise three layers of mixture (2, 2', 2") and of a lacquer/hardener/ diluent solution and of a pearly pigment.
3. A method of plasticising natural intestines according to one of claims 1 and 2, characterised in that it involves:
- smoothing the strings (3), which are tightened on pegs between two frames, from above and from below using a sponge imbibed with a solution of vinyl acetate and water which forms the adhesive layer (1);
- leaving said layer (1) to dry for at least 30 minutes;
-smoothing the tightened strings (3) from above and from below using a sponge imbibed with a solution which forms the layer (2), said solution being obtained by mixing a lacquer and a hardener to which a diluent is added, as well as a pearly pigment based on mica coated with titanium dioxide and having a very fine grain size, this pearly pigment having to be added to the solution by gentle mixing;
- repeating this operation, if necessary, until the desired number of layers is obtained at intervals of at least 30 minutes.
4. A method of plasticising natural intestines according to claim 3, characterised in that the solution forming the layer (1) advantageously contains about 20% of vinyl acetate and 80% of water.
5. A method of plasticising natural intestines according to claim 3, characterised in that the solution forming the layers (2, 2' and 2") advantageously contains about 50% of lacquer, 40% of hardener and 10% of solvent, the quantity of pearly pigment to be added being about 40 g per litre of solution.
EP86440062A 1985-07-17 1986-07-16 Natural intestines provided with a protection against humidity, especially for tennis racket strings Expired - Lifetime EP0213053B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86440062T ATE54575T1 (en) 1985-07-17 1986-07-16 NATURAL GUT WITH MOISTURE PROTECTION, ESPECIALLY FOR TENNIS RACKET STRINGS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511049 1985-07-17
FR8511049A FR2584934B1 (en) 1985-07-17 1985-07-17 NATURAL HOSES WITH MOISTURE PROTECTION, PARTICULARLY FOR TENNIS RACKET STRINGS

Publications (2)

Publication Number Publication Date
EP0213053A1 EP0213053A1 (en) 1987-03-04
EP0213053B1 true EP0213053B1 (en) 1990-07-18

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Application Number Title Priority Date Filing Date
EP86440062A Expired - Lifetime EP0213053B1 (en) 1985-07-17 1986-07-16 Natural intestines provided with a protection against humidity, especially for tennis racket strings

Country Status (4)

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EP (1) EP0213053B1 (en)
AT (1) ATE54575T1 (en)
DE (1) DE3672715D1 (en)
FR (1) FR2584934B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691141A1 (en) * 1994-06-06 1996-01-10 Lovato, Gianfranco Gut strings for tennis rackets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB897155A (en) * 1958-07-23 1962-05-23 Willi Bayer Strings for musical instruments and processes for making the same
US4391088A (en) * 1982-01-13 1983-07-05 United States Tennis Gut Association, Inc. String for sports rackets

Also Published As

Publication number Publication date
FR2584934B1 (en) 1987-07-31
FR2584934A1 (en) 1987-01-23
EP0213053A1 (en) 1987-03-04
DE3672715D1 (en) 1990-08-23
ATE54575T1 (en) 1990-08-15

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