The latest generation of screen-changer controls from High-Technology Corp., Hackensack, N.J., enables complete integration of the extrusion process, including remote start/stop and interlocking features for high melt pressure. For the first time, various voltages for the heating elements can be accommodated, and the same supply voltage is used for both the process and control zones.
These controls provide continuous feedback on all the unit’s operating parameters, which are set via a door-mounted display panel. Alarms and indicators immediately alert to a system malfunction and facilitate troubleshooting by pinpointing the source of any failure. Temperature and pressure indicators have digital displays and security codes.
Safety features prevent operating the screen changer in an incorrect or unsafe mode, and include protections to prevent the operator from inputting improper settings or attempting accidental, unintended maneuvers.