Making mineral fibers including adjustment of the position of a stream of glass and a rotor

Process of obtaining mineral fibers from a thermoplastic material comprising the steps of:

• melting the material,
• discharging the melted material in the form of a stream from a starting point to a point of impact onto a defined rotor of a centrifugal spinning machine having at least one rotor, whereby the stream of melted material arriving on one of said at least one rotors divides in two parts, one part remaining adhered to the periphery of said one rotor and the other part being ejected, such that mineral fibers are obtained;
• a first step of directly determining the position of the discharged stream in relation to the rotor in a first horizontal direction which is approximately perpendicular to a vertical plane containing the stream;
• a second step, occurring simultaneously with said first step, of determining the position of the said material in the melted state adhered to the periphery of a given one of the at least one rotors in a second horizontal direction substantially parallel to the vertical plane containing the stream;
• and
• a step of adjusting the position of at least one of the stream and at least the given rotor to regulate the position of the point of impact on the defined rotor in accordance with the positions determined in the first and second steps.