... 3ply, 5ply, 7ply, and multi-function corrugated cardboard production line mainly consist of the following equipments. The 3ply, 5ply ... corrugated cardboard production line mainly consist of the following equipments: Mill Roll Stand, Pre-conditioner, Pre-heater, Auto-splicer, ... Single Facer, Conveying Span Bridge, Multi-ply Pre-heater, Glue Application Machine, Double Facer, ...