FIELD: process engineering.
SUBSTANCE: invention relates to blades for thermoplastic polymer pelletising and to method of their sharpening. Said blade is made from tool steel for cold machining with hardness making at least 65 units in Rockwell C-scale. Prior to fitting in pelletiser, said blade is heated treated at 500-700°C for over 5 minutes at the rate equal to or lower than 15°C/min. Blades are sharpened by abrasion against extrusion head plate surface. Force acting on blade at pressing it against plate surface does not exceed 0.5 N. Simultaneously, cooling is performed by circulating thermostatic fluid at variable flow rate.
EFFECT: higher quality of cutting, lower wear rate.
10 cl, 4 dwg, 2 tbl, 6 ex
