Control system of super-critical CO2 polypropylene foaming production line

Abstract

The invention discloses a control system of a super-critical CO2 polypropylene foaming production line. The control system comprises a monitoring center, a main machine control system and an auxiliary machine control system. The main machine control system comprises a first PLC, a plurality of electromagnetic valves, a plurality of pressure sensors, a plurality of vector expression metering hoppers, a gravity sensor, a servo controller, a temperature control module and a rheometer. The electromagnetic valves, the pressure sensors and the vector expression metering hoppers are connected with the first PLC. The auxiliary machine control system comprises a second PLC, and a laser thickness gauge, a neck mold gap automatic regulation machine head, a plurality of frequency converters and a laser diameter measuring instrument which are connected with the second PLC. The numerical values of pressure, temperature, threaded rod rotating speeds, material amounts and the like in the super-critical CO2 polypropylene foaming production line are monitored and regulated in real time, coordination control over all parameters is achieved, and control accuracy and production efficiency of the super-critical CO2 polypropylene foaming production line are effectively improved.

Description

technical field [0001] The invention relates to the field of polypropylene foam production control, in particular to a supercritical CO 2 Control system of polypropylene foam production line. Background technique [0002] Polypropylene foam material has good flexibility, impact resistance, high temperature resistance, and the product is degradable. In recent years, it has gradually been widely used as a substitute material for PE, PVC, and PS. Supercritical CO 2 Non-toxic, odorless, non-flammable and non-explosive, and can be easily dissolved in polymers, it is an ideal gas for polypropylene foaming. Such as figure 1 As shown, the current use of supercritical CO 2 Production of polypropylene foam materials, the entire production line includes hoppers, supercritical CO 2 Injection device, extruder (including first-stage extruder and second-stage extruder), head mold, auxiliary machinery and other parts, the processes involved are feeding, gas injection, shear mixing, ext...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a supercritical CO 2 The control system of the polypropylene foaming production line to solve the problems of low control precision and low production efficiency of the polypropylene foaming production line existing in the prior art

Images