A professional who tends machine that applies sealing glue, such as dextrin or latex, to envelope flaps and dries them by passing envelopes under heat element. Responsibilities include:

• Fills glue reservoir, starts and regulates burners in drying unit, and loads automatic feedrack with envelopes.
• Observes machine operation and examines envelopes to detect malfunctioning in feeding, gluing, or drying process.
• Adjusts rollers to regulate glue flow, and turns rheostat to synchronize rate of envelope feed with glue applicator.
• Removes jammed material from rollers.