Extrusion & Post
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Annealing Deformation of PBT Products
Fenómeno do problema
PBT products deform during annealing treatment, and the dimensions change after annealing.
Análise das causas
The annealing temperature is too high, approaching the softening point of PBT; there is no support or improper support during annealing; the release of internal stress of the product is accompanied by deformation.
Solução
Control the annealing temperature at 120-130°C; use fixtures to support and maintain the shape; raise and lower the temperature slowly.
Conclusão principal
PBT annealing deformation requires suitable tooling and heating rate.
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