PROCEDIMENTO PER LA PRODUZIONE DI FILI O CAVI DI MATERIALE TER MONOPLASTICO SINTETICO IN PARTICO LARE DI POLIAMMIDI AVENTI UN ANI MA CAVA LONGITUDINALE NELL INTER NO E PRODOTTI MEDESIMI OTTENUTI

摘要

Thermoplastic, esp. nylon-6, is extruded from a 10-25 mm nozzle, being air blown troug a central pin of dia. =1.5 mm and 1 mm bore. The extrusion is two stage cooled in water at controlled temps., ten hot stretched by passing throug rollers rotating at different speeds, and finally reeled. The finised tubing as excellent flexibility, toughness, mechanical strength and uniformity of diameter.