Molds & Tooling
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Excessive Post-Shrinkage of PEEK Products
Fenómeno del problema
PEEK products are dimensionally qualified at demolding, but dimensions continue to change after several days of storage or high-temperature use, and fits go out of tolerance during assembly, causing complaints.
Análisis de la causa
Insufficiently crystallized amorphous regions undergo secondary crystallization upon subsequent heating, accompanied by volume shrinkage; slow relaxation of internal stress also causes slight shape change; the high-temperature use environment accelerates the post-shrinkage process.
Solución
①Raise the mold temperature to ensure crystallization is fully completed during molding; ②Subject products to temperature-conditioning setting treatment; ③Reserve post-shrinkage compensation in mold design; ④Perform dimensional aging verification at the use temperature.
Conclusión clave
The root of PEEK post-shrinkage is still crystallinity management; completing crystallization properly during molding is the most thorough solution; high-temperature applications must undergo aging dimensional verification before finalizing the design.
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