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