# Glue flap

> A glue flap is an extra strip of a packaging blank that bonds to another panel to form a seam.

Canonical: https://dielinemaker.com/glossary/glue-flap
Last updated: 2026-10-26

Geometry

## What it means in packaging

Its width, position and surface treatment must work with the adhesive and the folder-gluer. It is part of the structure, but often not a visible artwork panel once assembled. A narrower flap does not automatically mean a better sheet yield.

## A practical example

A tuck carton body closes when the narrow side flap is glued behind the opposite body panel.

## What to check

Keep the agreed glue area compatible with the adhesive; ask whether ink, varnish or laminate must be excluded.

## Use it in your project

- [Reverse tuck end template](https://dielinemaker.com/dielines/reverse-tuck-end)
- [Place artwork and manage layers](https://dielinemaker.com/learn/artwork-and-layers)

## Related terms

- [Blank](https://dielinemaker.com/glossary/blank) — A blank is the flat piece of material cut to shape before it is folded or assembled into packaging.
- [Coating](https://dielinemaker.com/glossary/coating) — A coating is a surface layer applied to paper, board or printed artwork to change its finish or performance.
- [Tuck end](https://dielinemaker.com/glossary/tuck-end) — A tuck end is a carton closure whose main flap has a tongue that slides inside the carton body.

## Related

- [Packaging glossary](https://dielinemaker.com/glossary)