Plastic Molding and Casting Machine Setters and Set-Up Operators

Set up or set up and operate plastic molding machines, such as compression or injection molding machines, to mold, form, or cast thermoplastic materials to specified shape.

Job Task

• Positions, aligns, and secures assembled mold, mold components, and machine accessories onto machine press bed, and attaches connecting lines.
• Installs dies onto machine or press and coats dies with parting agent, according to work order specifications.
• Presses button or pulls lever to activate machine to inject dies and compress compounds to form and cure specified products.
• Observes and adjusts machine set up and operations to eliminate production of defective parts and products.
• Weighs premixed compounds and dumps compound into die well or fills hoppers of machines that automatically supply compound to die.
• Reads specifications to determine setup and prescribed temperature and time settings to mold, form, or cast plastic materials.
• Sets machine controls to regulate molding temperature, volume, pressure, and time, according to knowledge of plastics and molding procedures.
• Mixes catalysts, thermoplastic materials, and coloring pigments according to formula, using paddle and mixing machine.
• Repairs and maintains machines and auxiliary equipment, using hand tools and power tools.
• Trims excess material from part, using knife, and grinds scrap plastic into powder for reuse.
• Removes finished or cured product from dies or mold, using hand tools and airhose.
• Measures and visually inspects products for surface and dimension defects, using precision measuring instruments, to ensure conformance to specifications.

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