A professional who tends machine that mixes ground scrap rubber with pigments, caustics, and oils to prepare rubber for devulcanization. Respnsibilities include:

• Pulls slide on gravity chute or shovels ground scrap rubber into weigh hopper.
• Pulls lever to dump scrap rubber from weigh hopper into mixer.
• Measures and weighs pigments, caustics, and oils according to formula, and dumps or drains them into mixer.
• Starts machine that mixes materials for specified time.
• Pulls lever to release mixture from machine into pans.
• Lifts pans onto heater cars by hand or with hoist.
• Signals worker to move pans of mixed stock into heaters.
• May tend cracker mill that grinds scrap rubber into particles.
• May unload heaters and dump devulcanized scrap rubber from pans.
• May line pans with waxed paper or sprinkle with pulverized soapstone to prevent rubber from sticking.