PaperFluteBasics
What is corrugated board?
A layered paper structure combining flat liners and a fluted medium to deliver strength at low weight.
Basic Knowledge
6 minbeginner·Updated 2026-06-20
Overview
Corrugated board is engineered from renewable paper: two flat sheets called liners are glued to a wavy sheet called the medium. The waves — flutes — create air columns that resist crushing and cushion the product inside. It is the dominant transport packaging worldwide because it is light, recyclable and highly customizable.
Classification
Single face
1 liner + 1 medium. Wrapping and interleaving.
Single wall
2 liners + 1 medium. Most e-commerce boxes.
Double wall
3 liners + 2 mediums. Heavy or fragile goods.
Triple wall
4 liners + 3 mediums. Industrial and export.
Advantages
- High strength-to-weight ratio
- Recyclable and renewable
- Fully customizable by size and print
Disadvantages
- Loses strength when wet
- Sensitive to humidity storage
Applications
- Shipping cartons for e-commerce
- Retail display packaging
- Industrial and export packaging
AI Summary
Corrugated board = 2+ liners glued to a fluted medium. Common builds are single-wall, double-wall and triple-wall. Choice depends on load, stacking, transport mode and humidity.