Nozzle tip for producing glass fibers and method for producing glass fibers

A nozzle tip for producing a glass fiber that is flat in cross-sectional shape, the nozzle tip being used by downwardly projecting from a bottom surface portion of a storage tank that stores a glass melt,

• the nozzle tip comprising a pair of long-side walls and a pair of short-side walls, each of the long-side walls and the short-side walls comprising platinum or a platinum alloy, and a nozzle orifice for discharging the glass melt,
• wherein the nozzle orifice has a flat hole shape in horizontal cross-section,
• wherein each of the long-side walls has a cut-out on a discharge side of the glass melt, a width of the cut-out being 10-55% of a length of a longitudinal center axis of the flat hole shape of the nozzle orifice, the width of the cut-out being defined along the longitudinal center axis of the flat hole shape of the nozzle orifice, and
• wherein the pair of long-side walls has a symmetrical shape about the center axis of the nozzle orifice,
• wherein an end surface on a side of the cut-out of the long-side wall has an inclined surface resulting from a gradual decrease of a thickness of the long-side wall toward the side of the cut-out, and
• wherein the inclined surface faces an inner side of the nozzle tip.