STRETCHING/BLOWING CONDITIONS IN ONE-STAGE INJECTION-STRETCH-BLOW-MOULDING

摘要

The present invention discloses a method for preparing containers by one-stage injection-stretch-blow-moulding with a resin comprising:-a random copolymer of propylene (RCP) having a melt index of from 1.5 to 35 dg/min, an ethylene content of less than 6 wt% with respect to the weight of the RCP; and-optionally a nucleating and/or a clarifying agent; wherein the preform injection temperature is larger than 200 °C and wherein the stretching and blowing temperature Tsb is limited to a very narrow range T of at most 15 °C, said range being a function of the injection temperature Tinj.