GLASS-MELTING CRUCIBLES CONTAINING TERMINAL LEDGES WITH RECESSES Russian patent published in 2017 - IPC C03B37/83 

FIELD: glass.

SUBSTANCE: invention relates to equipment for production of glass fibre. Glass-melting crucible (2) containing terminal ledges for heating of spinneret holder and walls, attached to opposite end walls (2A) of the crucible, each terminal ledge comprises electrically conductive plate (1) having the first outer edge (1D), attached to the first end wall (2A) of the vessel and extending from said end wall to the second free outer edge (1A), made with possibility of connection to power supply (5, 6), said plate has recess (3) containing: (a) a first open end (3A), width W_A, located on the second free edge (1A) of the plate; (b) elongated section (3B) passing in direction of the first outer edge (1D), width W_B, and (b) of the second closed end (3C) separated from the first outer edge (1D) of the terminal ledge, of a curved shape, note that curvature, 1/(2R), at any point of curved second end (3C) of the recess is less than the value 1/W₀ reciprocal to minimum gap width W₀, the first open end (3A), W_A, and elongated section (3B), W_B, where R is radius of curvature of curved second end (3C) in any point.

EFFECT: technical result consists in reduction of rise of internal stresses inside the projection of a terminal, subjected to temperature drop with providing higher freedom of design to reduce cooling of end walls.

8 cl, 4 dwg