Extrusion & Post
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Annealing treatment of high impact polystyrene products to improve stress
Problem Phenomenon
Products have large internal stress after processing; annealing treatment reduces residual stress, improving dimensional stability and stress cracking resistance.
Cause Analysis
(1) Residual stress generated during processing needs to be released by annealing
(2) Product use environment temperature is high; unannealed products easily deform or crack
(3) High-precision products need annealing to stabilize dimensions
(4) Large product wall thickness, large residual stress requires annealing
(5) Products need to contact chemical media; annealing improves stress cracking resistance
Solution
(1) Annealing temperature set 5-10°C below heat deflection temperature (usually 60-80°C)
(2) Annealing time determined according to product wall thickness, usually 1-4h
(3) Uniform annealing environment temperature, temperature difference not exceeding ±3°C
(4) Slowly cool to room temperature after annealing
(5) Test product dimensional change and stress improvement effect after annealing
Key Takeaway
Annealing treatment is an effective method to reduce product residual stress.
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