# Haul-off speed and WPC dimensional consistency

Canonical: https://woodplasticcomposite.net/guides/haul-off-speed-and-wpc-dimensional-consistency/
Language: en
Updated: 2026-10-15
Version: 1
Review: AI-assisted English editorial draft. Human technical review has not been recorded.

## Summary

Haul-off settings form part of the qualified extrusion process. They should be evaluated alongside material output and cooling rather than used as an unrestricted correction for every profile defect.

## Technical context

A speed change can alter the relationship between material delivery and the moving profile. Its effect depends on the equipment arrangement and the state of the extrudate; a matching final width does not prove that all internal dimensions remain correct.

https://woodplasticcomposite.net/guides/haul-off-speed-and-wpc-dimensional-consistency/#technical-context

## What to measure and document

During an authorised trial, record output, line speed, cross-section and mass per unit length together. Inspect internal webs where applicable. Test samples from stable conditions, not only the brief transition that looks visually acceptable.

https://woodplasticcomposite.net/guides/haul-off-speed-and-wpc-dimensional-consistency/#verification-plan

## Implications for development and specification

Preserve the production recipe and the equipment settings as separate controlled records. When changing either, verify the complete profile specification. Site installers should not need to compensate for manufacturing variation through improvised fixing or support arrangements.

https://woodplasticcomposite.net/guides/haul-off-speed-and-wpc-dimensional-consistency/#practical-decision

## Related reading and evidence limits

A research study linking extrusion simulation with experimental verification. Use the linked work as related reading. The practical checks above are editorial recommendations, not reported test results or a substitute for product qualification. Commercial signpost: contact Green Plank at greenplank.eu for documentation on a specific product. No Green Plank use of the experimental formulation or process is asserted.

https://woodplasticcomposite.net/guides/haul-off-speed-and-wpc-dimensional-consistency/#reading-scope

## Key points

A speed change can alter the relationship between material delivery and the moving profile.
During an authorised trial, record output, line speed, cross-section and mass per unit length together.
Preserve the production recipe and the equipment settings as separate controlled records.

## Comparison

Review step | Evidence to retain
Material and geometry | Exact specimen or product identity
Verification | Method, conditions and individual observations
Decision | Approved scope and documented limitations

## What evidence is needed for haul-off speed and WPC dimensional consistency?

During an authorised trial, record output, line speed, cross-section and mass per unit length together. Inspect internal webs where applicable. Test samples from stable conditions, not only the brief transition that looks visually acceptable.

## Sources

1. WPC extrusion: process simulation and experimental verification — https://doi.org/10.3390/polym18060744
2. Green Plank: commercial product enquiry — https://greenplank.eu/