Tend machines that form opening in paper bags.
What does a Valving Machine Operator do?
Tends machine that forms opening in paper bags through which loose materials, such as cement, sugar, lime, fertilizers, and sand are poured into bag: Positions unsewed paper bag on machine bed between guide arms. Depresses pedal or moves lever to start machine that automatically creases and folds bottom of paper bag to form valve, and discharges it onto conveyor. May tend sleeve machine that automatically cuts and glues strips of paper used to close valves of filled bags [SLEEVER]. May tend machine that forms valve and sews ends of bags and be designated Combination Valving-And-Sewing-Machine Operator.