What is a folder-gluer?

Blanks are fed in a continuous stream, travel through folding sections that progressively break each crease, receive a bead of adhesive at the right moment, and are compressed as the glue sets. A straight-line carton runs quickly; a crash-lock base needs extra folding stations and runs more slowly.

What the machine can handle constrains the design, which is the part worth knowing before the dieline is drawn. Glue flap width, crease accuracy, the squareness of the blank and the absence of coating on the glue area all determine whether a carton runs cleanly or jams. A design that assembles perfectly by hand can be impossible to run automatically, and finding that out during production is expensive.

Some constructions are never machine-glued at all. Rigid boxes are wrapped and assembled by hand, and complex multi-panel or unusually shaped cartons are often hand-finished. That is a real cost and lead-time difference rather than a detail: hand assembly is why rigid boxes take substantially longer than folding cartons.

If your product is filled on an automatic line, tell us at the quotation stage. The requirements of your filling equipment feed back into the dieline.

Running speed also depends on the board. Very light stock flutters and jams; very heavy stock resists folding and needs slower running with longer compression while the glue sets. Neither is a problem, but both affect how long a run takes — worth raising when a quantity and a deadline are both tight.