Method for manufacturing restored winding cores

A method for manufacturing restored winding cores comprising the steps of:

• a) collecting discarded winding cores, each of said cores having a first and a second extremity;
• b) internally grinding on a predetermined grinding distance each of said extremities of each of said discarded winding cores to provide internal ground portions thereon, said ground portions defining corresponding female joint sockets, each having a predetermined socket length and a predetermined socket thickness;
• c) providing hollow insert tubes diametrically snugly fitting into the female joint sockets, each of said hollow insert tubes having a cylindrical wall of a predetermined wall thickness corresponding to said socket thickness and a length corresponding to twice the predetermined socket length;
• d) supplying an apparatus with the discarded winding cores of step b) and with the plurality of hollow insert tubes of step c), the apparatus inserting each of said hollow insert tubes inside the corresponding joint sockets of successive ones of the discarded winding cores for joining said discarded winding cores end to end to form a recycled master core having an internal surface continuity therein, the recycled master core being moved forward by the apparatus with a rotational movement;
• e) spirally winding a finishing fold around the recycled master core and therealong for providing an endless restored winding core;
• and
• f) cutting said endless restored winding core to a predetermined length, wherein said steps d), e) and f) are performed continuously on the same apparatus.