Mineral fiber forming device

A mineral fiber forming device for producing an insulating product comprising:

• a molten glass feeding system configured to supply molten glass;
• a hollow shaft having a top end coupled to the molten glass feeding system so as to receive the molten glass,
• a centrifuge coupled to a bottom end of the hollow shaft so that the molten glass flows into the hollow shaft until the molten glass arrives into the centrifuge when the device is in operation, the hollow shaft having a same axis of symmetry as the centrifuge, the centrifuge being configurated to rotate about a rotation axis, the centrifuge comprising an annular wall pierced by a plurality of orifices, an axis of symmetry of the annular wall being the rotation axis, and the annular wall having a height,
• a first annular inductor positioned above the annular wall and configured to heat a top area of the annular wall to generate a first heating zone on said annular wall,
• a second annular inductor comprising one or more coils, the second annular inductor positioned below a bottom of the annular wall such that each of the one or more coils is positioned below the annular wall pierced by a plurality of orifices and such that the second annular inductor is configured to heat a bottom area of the annular wall to generate a second heating zone on said annular wall,
• one or more power generators adapted to power said first and second annular inductors so that said first heating zone and said second heating zone only partially overlap on said annular wall to generate a gradient of temperatures along the height of said annular wall;
• a conveyor configured to receive and convey mineral fibers,
• a first blowing ring configured to blow air on the mineral fibers that are about to leave through the plurality of orifices in the annular wall so as to drive them to the conveyor,
• wherein the mineral fiber forming device is devoid of any burner located externally to said centrifuge.