A machine whose principal function is forming paperboard into boxes or cartons — even if it also cuts and scores — classifies under 844130 (machines for making cartons, boxes, cases, tubes, drums, and similar containers). The converting function, not the cutting step, governs classification.

Machines that form articles — such as egg cartons, protective trays, or food-service containers — by molding paper pulp fall under 844140. This distinguishes them from machines that cut or fold pre-formed paperboard, which classify under other subheadings within 8441.