Device and method for turning selvedges on a calender

摘要

Method of calendering the continuous ply of reinforcing threads, during which: said ply of reinforcing threads is positioned between a continuous upper sheet of rubber and a continuous lower sheet of rubber, said sheets of rubber having a width greater than the width of the ply of reinforcing threads, so that the two lateral parts of said sheets of rubber which are not vertically aligned with the ply of reinforcing threads form selvedges. The assembly formed in the preceding step is introduced into the nip of a calendering comprising at least two rolls, so as to cause the rubber to penetrate the spaces between the reinforcing threads. Prior to the ply of reinforcing threads and the sheets of rubber being introduced into the nip of the calender, the two selvedges of one of the sheets of rubber are turned up on themselves.

主权项

1. A method of calendering a continuous ply of reinforcing threads, comprising:
positioning a continuous ply of reinforcing threads having spaces between adjacent reinforcing threads between a continuous upper sheet of rubber and a continuous lower sheet of rubber to form an assembly comprising the continuous ply of reinforcing threads and the sheets of rubber, said sheets of rubber having a width (Ls) greater than a width (Lf) of the continuous ply of reinforcing threads, so that two lateral parts of said sheets of rubber which are not vertically aligned with the ply of reinforcing threads form selvedges, introducing the assembly formed in the preceding step into a nip of a calender comprising at least two calendering rolls, to cause the rubber to penetrate the spaces between the reinforcing threads, turning up both selvedges of at least one of the sheets of rubber on themselves such that each turned up selvedge comprises a selvedge edge portion folding each selvedge so that there is contact between portions of selvedge, wherein the step of turning up both selvedges of at least one of the sheets of rubber on themselves is performed prior to the step of introducing the assembly into the nip of the calender.