Extrusion & Post
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Annealing Treatment of acrylonitrile-styrene copolymer Products to Improve Stress
Problem Phenomenon
The internal stress of the product after processing is large; annealing treatment is used to reduce the residual stress and improve dimensional stability and stress cracking resistance.
Cause Analysis
（1）The residual stress generated during processing needs to be released by annealing
（2）The product service environment temperature is high, and non-annealed products easily deform or crack
（3）High-precision products need annealing to stabilize dimensions
（4）The product wall thickness is large, the residual stress is large, and annealing is needed
（5）The product needs to contact chemical media, and annealing improves the stress cracking resistance
Solution
（1）Set the annealing temperature to 5-10°C below the heat deflection temperature (usually 60-80°C)
（2）The annealing time is determined according to the product wall thickness, usually 1-4h
（3）The annealing environment temperature is uniform, with the temperature difference not exceeding ±3°C
（4）Slowly cool to room temperature after annealing
（5）After annealing, test the dimensional change of the product and the stress improvement effect
Key Takeaway
Annealing treatment is an effective method to reduce the residual stress of products.
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