A professional who tends injection-molding machines that form plastic or rubber products, such as typewriter keys, phonograph records, and luggage handles. Respnsibilities include:

• Dumps plastic powder, preformed plastic pellets, or preformed rubber slugs into hopper of molding machine.
• Starts machine that automatically liquefies pellets, slugs, or powder in heating chamber, injects liquefied material into mold, and ejects molded product.
• Observes gauges to ensure specified molding temperature and pressure are maintained.
• Examines molded product for surface defects, such as dents and cracks.
• May heat plastic material over steamtable or in oven to prepare material for molding.
• May remove product from mold, using handtools.
• May trim flash from product, using shears or knife.
• May place product in cold water or position it on cooling fixture to prevent distortion.