Process for producing strings for stringing rackets

A process for producing a string for a racket, in which

• the surface (12) of an unheated string (10) made of plastic is processed so as to form a surface profile (20) on the string (10),
• wherein
• the string (10) is permanently deformed under pressure to form the surface profile (20) by depressions (14) being impressed in the surface (12) of the unheated string (10) by providing pairs of undriven shaping rollers (44a, 44b, 44c, 44d) which rotate about spaced-apart spindles (46a, 46b, 46c, 46d), the shaping rollers (44a, 44b, 44c, 44d) each comprising a circumferential surface (50) which has the negative form of the surface profile (20) which is to be impressed in the surface (12) of the string (10),
• the shaping rollers (44a, 44b, 44c, 44d) are arranged opposite each other with an interspace therebetween such that the distance between the circumferential surfaces (50) of the shaping rollers (44a, 44b, 44c, 44d) is slightly smaller than the external diameter (A) of the string (10) which is to be processed, and
• the string (10) is transported into the interspace between the shaping rollers (44a, 44b, 44c, 44d), so that the circumferential surfaces (50) of the shaping rollers (44a, 44d, 44c, 44d) press against the string (10), whereby the string (10) is transported by an advancement means (36, 38, 39) located downstream of the shaping rollers (44a, 44b, 44c, 44d) with the result that the circumferential surfaces (50) roll on the surface of the progressing string (10) to thereby drive the shaping rollers (44a, 44b, 44c, 44d).