Extrusion Cooling Path Length Calculator

Convert take-off speed and a trial-based cooling residence time into required in-water or controlled-cooling path length.

Formula and method

Required path length (m) = line speed (m/min) × required cooling residence time (s) ÷ 60.

Inputs and units

Use measured take-off speed and a cooling residence time established from a resin/process trial, heat-transfer analysis, or supplier guidance. Enter usable straight path per pass if considering a multi-pass arrangement.

Worked example

At 8 m/min with 45 s required residence, the controlled cooling path is 6 m; a 3.5 m usable straight path requires at least two idealized passes.

When to use it

Use for floor-layout screening, cooling-bath or spray-path planning, and assessing the line-speed effect of a validated cooling-time requirement.

How to interpret the result

The path is a kinematic requirement. If available path is shorter, reduce speed, improve the validated cooling method, add path, or revisit the product and material plan.

Assumptions and limitations

The tool does not calculate the required cooling time or heat-transfer coefficient. Water temperature, agitation, product section, crystallization, sizing contact, air gaps, and handling constraints remain separate.

Validation guidance

At the planned speed, verify exit temperature, shape retention, dimensions, surface, crystallinity where relevant, and downstream handling. Re-establish the time after material or section changes.

FAQ

Can I use the default 45 seconds for any extrusion?

No. The default is a worked arithmetic example only. Enter a trial- or supplier-supported time for the exact product, material, and cooling system.

Sources

SPE Extrusion Division: Planning the Extrusion Line · Eastman: Extrusion of Tubing and Profiles