Corrugated Box Machine Suppliers & Manufacturers

Corrugated board production and converting

Corrugated packaging is produced in two stages: corrugated board production (the corrugator produces flat sheets of corrugated board); and corrugated converting (converting machines cut, score, print, fold, and glue the flat sheets into finished boxes, trays, and displays). Corrugated board production — the corrugator: a corrugator is a large, continuous production machine that produces corrugated board from paper rolls; the inner medium paper is corrugated (fluted) by passing between heated corrugating rolls; the fluted medium is glued to one or two flat liner sheets; the result is single-face (one liner) or double-face (two liners) corrugated board (the familiar brown corrugated sheet); board flute types: A-flute (5mm) — cushioning and stacking strength; B-flute (3mm) — good crush resistance, common for display packaging; C-flute (4mm) — the most common general-purpose flute; E-flute (1.5mm) — fine flute for point-of-purchase displays and outer cartons; F-flute (0.7mm) — microflute for premium retail applications; double-wall and triple-wall board (two or three fluted layers) for extra strength. Corrugated converting machines: flexo folder gluer (FFG) — the main converting machine; prints on the board (flexographic printing, 2–4 colours), cuts and creases (die-cut or slotted), folds, and glues the box blank in one pass; produces RSC (regular slotted container) and similar box styles; output rates of 10,000–50,000 boxes per hour on high-speed machines. Die-cutter: a flatbed or rotary die-cutter cuts complex box blank shapes, display trays, and die-cut boxes that cannot be produced on a folder gluer. Stitcher (stapler): a wire stitcher staples box blanks instead of gluing — used for heavy-duty cases and certain export markets. Case taper / box erector-taper: these are downstream packaging machines used in the end-packing line, not box manufacturing equipment.

Machine scale, board grades, and sourcing

Corrugated board and box production is divided between large integrated corrugated board mills (who run full-width corrugators and supply sheets and boxes to the market) and smaller independent box plants (who buy corrugated sheets from a sheet feeder or mill and convert them on their own machines). For businesses considering entry into corrugated converting: sheet-fed converter — buy pre-cut corrugated sheets from a sheet feeder and run a die-cutter, folder gluer, and stitcher to produce finished boxes; lower capital investment than a full corrugator; suitable for short-to-medium run local supply. Independent box plant with a slitter scorer and FFG — produces standard RSC cases and slotted boxes from purchased board; produces 10,000–100,000+ boxes per day. Full corrugator operation — the largest investment; produces board and converts in-house. Board grades: Kraft liner (KL) — virgin kraft fibre; high strength; standard for export and demanding applications. Test liner (TL) — recycled fibre; adequate for domestic distribution. White top liner — kraft or test liner with a white coated top surface for printing. Recycled medium (semi-chemical or recycled). Board combination (e.g. KL/medium/KL) determines the box's ECT (edge crush test) performance — the key structural specification for corrugated cases. Key machinery suppliers: BHS Corrugated (Germany), Fosber (Italy), ISOWA (Japan), Koenig & Bauer (printing), BOBST (die-cutting), Sun Automation (US), and many Chinese corrugated machinery manufacturers. When sourcing, specify: target board type (single-wall, double-wall), flute profile(s) required, production width, target output, print requirement, box styles required, and whether a full corrugator or sheet-fed converter is planned.

Frequently asked questions