Extrusion & Post
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Orange Peel Surface in PEEK Extrusion
Problem Phenomenon
The surface of PEEK extruded profiles shows an orange-peel-like uneven texture, with poor gloss and rough feel; the appearance quality cannot meet the requirements of precision profiles.
Cause Analysis
Insufficient melt fluidity, rough die surface, or too fast cooling all form orange peel; the surface state of the melt when leaving the die lip is fixed by rapid cooling, and microscopic unevenness remains as visible texture.
Solution
①Raise barrel or die temperature to improve melt fluidity; ②Polish the die and fully preheat it; ③Change quenching to controlled multi-stage slow cooling to reduce surface stress and temperature difference; ④Check the die lip finish.
Key Takeaway
PEEK orange peel treatment revolves around the three elements of melt state, die state, and cooling method; multi-stage slow cooling is more favorable to surface quality than quenching; die polishing is basic work that is often overlooked.
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