METHOD OF MANUFACTURE OF PLATE FOR PLATE-TYPE TUBE HEAT EXCHANGER Russian patent published in 1999 - IPC

FIELD: refrigerating engineering. SUBSTANCE: prior to piercing holes in separate runs, drawing of grooves of different heights is effected: at first run, all grooves or only central grooves (in the amount of 1 to 2) are drawn; at subsequent runs, all grooves are drawn; at initial runs, central grooves whose height exceeds height of all groves by 15% are draw. EFFECT: reduction of rejects; extended technological capabilities due to wide range of plates. 2 cl, 4 dwg