A professional who tends machine that mercerizes yarn in skein form. Respnsibilities include:

• Shakes skeins of yarn to remove tangles and loads skeins on roller arms of machine.
• Starts machine that puts yarn under tension, passes skeins through caustic solution, and rinses skeins.
• Tests caustic solution, using hydrometer, and adds soda or water to maintain uniform strength as specified.
• Removes skeins from mercerizer and hangs skeins on rack of tank for neutralizing.
• Turns valves to start spray of water and neutralizing solution.
• Tests neutralization, using litmus paper.
• May weigh and mix caustic and neutralizing solutions according to formula.
• May extract moisture from yarn and dry yarn in steam chamber.