Abstract:

In the precise extrusion processing of polymers , the melt temperature and the pressure in the die constitute a key factor to the quality of the extruded product. In this paper , some dynamic characteristic experiments were carried out , and a transfer function matrix model was established according to the experimental data obtained via system identification. The model was used to describe the relationships between the input signals related to melt
temperature and die pressure and the output signals concerning heater power and screw speed. Then , a fuzzy decoupling control algorithm of melt temperature and die pressure for the precise extrusion processing was proposed and finally implemented on a programmable computer controller. Experimental results show that the proposed algorithm is effective and contributes significantly to the development of the control technology of precise extrusion processmg.

Key words: extrusion, melt temperature, die pressure, multivariable system, fuzzy control