A professional who tends range that mercerizes and dries yarn in warp form. Respnsibilities include:

• Pours caustic soda, acids, and softeners into mixing tanks, according to formula.
• Turns valves to allow solutions to flow into mercerizing, neutralizing, and finishing vats.
• Mounts balls of warp yarn in creel, using hoist or lift and aid of yarn-mercerizer-operator helper.
• Ties ends of warp to leader, starts machine, and observes movement of warp through baths to detect breaks or tangles.
• Pulls broken yarn from vat, using hook, and ties ends.
• Tests caustic solution, using hydrometer, and adds water or caustic to restore solution to prescribed strength.
• Adjusts controls to regulate water and drier temperature and speed at which yarn passes through machine, according to yarn type.
• May tend discharge end of drier and observe yarn passing through swing-folding attachment into handtruck, boxes, or cans.
• May oil and make minor adjustments and repairs to machine.