METHOD AND DEVICE FOR CONTINUOUS CASTING AND MAKING GRANULES FROM THREADS OF THERMOPLASTIC MATERIAL

摘要

FIELD: process engineering.SUBSTANCE: invention relates to continuous casting and production of granules from threads of thermoplastic material. Proposed device comprises nozzle head with multiple nozzles, water-sprayer guide device to cool and direct polymer threads outcoming from nozzles via fee rollers to granulator inlet for it to grind polymer threads to obtain the granules. Said polymer threads feature higher velocity gradient in the nozzle spatially central area in direction from nozzle inner surface to central area wherein flow rate makes at least 100 m/min. Nozzle shape makes arbitrary cut volume segment of relatively large diameter ahead of the nozzles stretch notable in lengthwise direction after polymer threads enter the nozzles. Therefore its diameter decreases to be transformed into appropriate segment of the volume. Thereafter it passes through the nozzles wherein its surface is notably stretched. Polymer threads stretch so that volume segment thickness increase but crystallisation effect at segment surface caused by contraction in nozzles is not lost.EFFECT: decreased sticking of granules.2 dwg