GLASS MASS DROP CUTTING SCISSORS Russian patent published in 2001 - IPC

FIELD: construction material, glass and chemical production. SUBSTANCE: scissors have two knives, each provided with V-shaped blade with cutting parts positioned at an angle of 85-90 deg one with respect to the other. Cutting edge is positioned on these cutting parts. Blade material on the base of silicium nitride contains baking additive such as yttrium oxide used in an amount of 2-18 wt.%, or magnesium oxide used in an amount of 1.5-2.5 wt.%. Each knife has cover mounted on base, with ceramic blade between them. Length and width of blade exceed diameter of water glass flow. Cutting edge is equipped with additional face positioned between double-edged face. V-shaped metal base has end parts extending beyond ceramic blade by distance of at least 5 mm. Scissors may be used for dividing liquid glass flow into separate portions (drops). EFFECT: increased service life of cutting tool and improved quality of glass articles. 5 cl, 2 tbl, 2 ex