Abstract: In order to improve the uniformity of wall thickness of extrusion-blow-molded parts, several improvements were made, including an automatic control device of wall thickness was used, the structure of parison extrusion die was improved, and automatic close-loop control was used during the whole working process. The efficiency of the improved machine was greatly improved, and at the same time the weight deviation of the extrusion-blow-molded parts and the average energy consumption was decreased.

Key words: extrusion blow molding, wall thickness, extrusion die, close-loop control