A professional who tends pilling machine that compresses plastics powder into pellets or biscuits of specified weight and shape. Respnsibilities include:

• Dumps plastics powders into machine hopper, using drum hoist or starts screw conveyor that loads hopper with material from storage bin.
• Opens gate valve to control flow of powder from hopper into machine.
• Turns steam valve to regulate temperature of machine according to ammeter gauge, and adjusts die pressure to attain specified hardness of pill.
• May clean, change, and adjust die.
• May be designated according to type of machine tended as rotary preformer; single-stroke preformer.