Corrugated Flutes Explained

Close view of a kraft carton corner with rows of ventilation holes.
Overview

Flute is one part of a corrugated specification. The facing papers, board construction and box design also matter.

Describe the board

Specify the flute, facing papers, board construction and carton style together. Cartons with the same flute can still differ in papers, dimensions, seams and closures.

Describe the load

Describe the packed load and route before selecting a construction. Stacking, carrying, moisture exposure and the way the carton is closed can all affect the evaluation needed. A sample should include the actual contents and any internal supports.

Compare samples

Check print, folding and the loaded carton against the agreed requirements. Record dimensions, board reference, packed weight and closure method for comparison. Ask which evidence concerns the board and which concerns the assembled pack. Keep those scopes separate when deciding whether more evaluation is needed.

Related specification support

Packaging Structural Design

Develop a packaging construction around the actual product and its use.

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Record the complete board and pack

Two cartons described by the same flute letter may still use different liners or board combinations. Compare quotations using the actual construction, usable carton dimensions and packed load, then review the proposed sample.

Board construction and packed load

Check What to do Why it matters
Board Record flute and liner construction. A flute code is not a complete strength specification.
Carton Identify openings, closures and dimensions. Converted geometry affects the finished pack.
Use Describe loading, stacking and environment. An empty sample does not represent distribution.

Record the actual product, material or file version used for the comparison. Identify what remains undecided and which sample or document can resolve it.

Discuss corrugated board specification

Describe the product and proposed corrugated pack, then include available specifications and the sample or file for review.

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Further reference

FEFCO: corrugated design reference. Use the source to understand the topic; it does not certify an ElevaPack product or replace an agreed project specification.

Corrugated Flutes Explained FAQ

Select around the complete application. Space, printing, converting and transport needs can pull in different directions, so compare the actual packed options.

No. Include the facing papers, board construction, carton dimensions, seams and closures. A flute code alone is not a complete strength specification for the finished pack.

Use the actual contents and internal supports, with the proposed closure. Record packed weight, dimensions and board reference, and review the loaded carton against the intended handling, stacking and environmental conditions.