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Dielines, Bleeds & Crease Tolerances: Prepress Notes for Designers

Avoid costly press checks and misaligned flaps with this thorough guide to fluting grain directions, safety margins, and vector die preparation.

Marcus ReyesOctober 13, 2026 · 4 min read
Curated Read
Dielines, Bleeds & Crease Tolerances: Prepress Notes for Designers

A 3D render might look flawless on a screen, but the physical world answers to the laws of caliper thickness and fold displacement. Here is how master packaging designers prepare production dielines that fold impeccably every single time.

Accounting for Paperboard Caliper in Folds

When heavy paperboard folds 90 or 180 degrees, the material inside compresses while the outer face stretches. Adding 1.5x paper thickness to dust flaps ensures seamless closures without bulging.

About the Author

Marcus Reyes

Writing on packaging engineering, circular material substrates, typography, and structural design for the Fable Packaging journal. Covers the intersection of craft, ecology, and consumer experience.