Automated Setpoint Control for Tubing Extrusion Lines

Becoming an extrusion operator typically involves completing a high school diploma or GED, then gaining hands-on training through an entry-level manufacturing role or apprenticeship. Operators learn to set process parameters such as temperature, screw speed, and air pressure. Familiarity with setpoint control devices like motorized potentiometers and air pressure regulators is increasingly valuable for modern extrusion lines.

Automated setpoint control uses devices such as motorized potentiometers and ultra-low air pressure regulators to automatically adjust and maintain critical process variables — including internal air pressure and analog drive signals — on a tubing extrusion line. This ensures consistent tubing outside diameter, wall thickness, and structural integrity without constant manual intervention.

OLC's MicroAir regulators cover pressure ranges from as low as 0–2 inches of water up to 0–5 psi, with intermediate options including 0–3", 0–5", 0–10", 0–15", and 0–30" of water. This ultra-low range capability makes them uniquely suited for free-extrusion of medical, catheter, automotive, and multi-lumen plastic tubing.

Yes. MicroAir II units accept contact closure inputs (Air Up / Air Down) from OD diameter gauges or external controllers. MicroAir IV units accept 0–10 volt analog inputs, allowing direct integration with PLCs and other automation systems for high-speed switching, bump-and-taper tubing, and closed-loop diameter control on multi-channel extrusion lines.

A motorized potentiometer is a voltage-dividing device used to set analog signal levels for process controllers, drives, or PLCs, typically at low wattages (0.5W–5W). A motorized rheostat is used to vary resistance directly in a power circuit and is rated for higher wattages (25W–50W). Both combine a motor with a resistive element and slip clutch for automated or manual setpoint adjustment.

OLC motorized potentiometers offer life expectancies ranging from 500,000 turns for wirewound models up to 50 million turns for conductive plastic versions, depending on the element type. MicroAir air pressure regulators are engineered for a service life of 10 to 20 years in continuous extrusion line operation, with a 3-year warranty on all parts and labor.