Folding, Gluing, Double-Sided Tape Application , Window Patching

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Folding, Gluing, Double-Sided Tape Application, Window Patching

Folding and gluing

Folding and gluing is the critical final step in the packaging manufacturing process where flat, die-cut blanks of paperboard or corrugated board are converted into finished, three-dimensional boxes or envelopes.

Technique: Creased, die-cut paperboard or corrugated board is fed into a folder-gluer. Moving belts and plows systematically fold the flaps to specified angles. Simultaneously, an adhesive system (hot melt or cold PVA) is applied at critical joint points. The box then passes through a compression section to cure the bond and ensure structural integrity before it is packed flat.

Common Styles: Straight-line boxes, crash-lock (auto-bottom) boxes, and 4-6 corner trays.

Folding, Gluing, Double-Sided Tape Application, Window Patching

Double-Sided Tape Application

Technique: Specialty double-sided tapes (such as tissue, transfer, or foam tapes) are applied in-line on folder-gluers using automated tape applicators. These applicators automatically position the tape, cut it to length, and apply it with consistent pressure to avoid bubbles.

Uses: Vital for e-commerce packaging (creating peel-and-seal closures like tear strips) and for affixing POS displays, liner boards, or specialty rigid box lids.

Folding, Gluing, Double-Sided Tape Application, Window Patching

Stamp label

Technique: A transparent film (such as rigid APET, polyester, or flexible cellophane) is applied over a die-cut opening in a folding carton. A window-patching machine applies an adhesive pattern around the cut-out, cuts the exact shape/length of film from a continuous roll, and affixes it firmly to the carton.

Uses: Used heavily in food, cosmetics, and toy packaging to protect the product while letting consumers see what is inside.

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