A professional who operates extruders and calender mill to remove moisture from butyl rubber crumbs. Respnsibilities include:

• Presses buttons on control panel to start conveyors that feed rubber crumbs from drier through extruder and into hot mill.
• Opens breech-lock head on extruder, using wrenches.
• Removes foreign matter from equipment, using hot hoe and wooden tamper.
• Turns handwheel to adjust space between rollers on hot mill to remove moisture and to regulate thickness of product on rollers.
• Observes color and surface characteristics of rubber to determine degree of dryness.
• Turns valves on steam lines to maintain temperatures.
• Turns handwheels to adjust mill knives.
• Cuts samples of product for laboratory tests and cleans undried rubber from rollers for remilling, using knife.
• Inspects machinery for lubrication and to detect mechanical malfunction.