Process for producing parisons from a thermoplastic for blow moulding hollow bodies

摘要

The invention relates to a process for producing tubular parisons with a specified longitudinal profile of wall thickness for blow moulding hollow bodies from a thermoplastic. To provide maximum profile constancy with, at the same time, a high production rate, the extrusion process is controlled such that the emergence acceleration (b(x)) of the resulting parison (6) and/or the derivative (W') with respect to time of the gap width (W) do/does not exceed, in value, specified limiting values (bmax; W'max). <IMAGE>