A person or machine that packs or places items into cartons or cardboard boxes.
From carton combined with the agent noun suffix -er (one who does something). As industrial packaging became standardized, this term emerged to describe both human workers and automated machinery.
In factories, cartoners might be robots that can pack thousands of items per hour with perfect precision—they're actually among the most common industrial robots because packaging is so repetitive and economically important to manufacturers.
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