Strings formed at least partially of synthetic material
OwnerJacques Andre Robininventor
Life of this patent
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Abstract
Strings constituted at least in part of synthetic material are described made of a bundle of multifilaments selected from the class consisting of natural and synthetic filaments which is impregnated with a thermosettable adhesive, with the multifilaments in non twisted condition, the adhesive is allowed to polymerize partly, the string is twisted and polymerization is then completed. Such strings are of particular value in stringing tennis rackets.
Claims14
A process of manufacturing strings constituted at least in part of synthetic material, said process comprising the following steps:
- (a) forming at least one bundle of multifilaments of material selected from the class consisting of synthetic and natural materials, the filaments being parallel one to another,
- (b) impregnating all the multifilaments of said bundle with a thermosettable adhesive impregnation product having an appropriate elasticity when hardened,
- (c) making said impregnation product prepolymerise up to a chosen degree of partial polymerisation,
- (d) twisting said bundle while avoiding the drying out of its impregnated multifilaments thanks to the partial degree of polymerisation chosen for this twisting step and
- (e) finally completing the polymerisation of said impregnation product to harden the same.
A process of manufacturing strings constituted at least partially of synthetic material, said process comprising the following steps:
- (a) forming at least one bundle of multifilaments in a material selected from the class consisting of synthetic and natural materials, the multifilaments being parallel one to another,
- (b) impregnating all the multifilaments of said bundle by immersing the said bundle in a bath of thermosetting adhesive impregnation product which is a liquid of low viscosity at ambient temperature and which has an approprite elasticity when hardened,
- (c) passing said bundle through a die of predetermined size so that the coat of liquid impregnation product surrounding the said bundle is eliminated,
- (d) making said impregnation product in said bundle prepolymerise up to a chosen degree of partial polymerisation,
- (e) twisting said bundle while avoiding the drying out of the impregnated multifilaments thanks to the degree of partial polymerisation chosen for this twisting step, and
- (f) finally completing the polymerisation of said impregnation product to harden the same.
A process for manufacturing strings constituted at least in part of synthetic material, said process comprising the following steps:
- (a) forming at least one bundle of multifilaments in a material selected from the class consisting of synthetic and natural materials, the multifilaments being parallel one to another,
- (b) impregnating all the multifilaments of said bundle with a thermosettable adhesive impregnation product having an appropriate elasticity when hardened,
- (c) making the impregnation product in said bundle prepolymerise up to a chosen degree of partial polyermisation,
- (d) twisting said bundle while avoiding the drying out of its impregnated multifilaments thanks to the degree of partial polymerisation chosen for this twisting step,
- (e) passing said impregnated and twisted bundle through a die of predetermined size so that a continuous sheath of impregnation product of predetermined thickness is retained around the said bundle, and
- (f) finally completing the polymerisation of said impregnation product to harden the same.
Dependencies are inferred from the claim text.