A professional who tends machine that mixes and strains filling and coating materials for paper. Respnsibilities include:

• Weighs and dumps specified quantities of materials, such as clay, soda ash, titanium dioxide, lithopone, or gypsum, into hopper of mixing machine.
• Turns valve to admit metered volume of water into mixing machine and starts machine that mixes ingredients.
• Starts pumps that force mixture through straining screens and into storage tanks.
• Lifts screens from machine and washes screens with water hose.
• May deliver sacks of materials to mixer, using handtruck or forklift truck.
• May weigh and add specified quantities of color pigments to mixture.
• May plan mixing according to paper production orders.