Extrusion & Post
11 조회수
PC annealing treatment specification
문제 현상
Product internal stress exceeds standard, transparent parts have optical distortion, and crack immediately after solvent wiping
원인 분석
Orientation stress frozen during molding is not released, and the product is in a metastable state; when encountering solvent, load, or temperature difference, stress release manifests as cracking; annealing can relax molecular chains back to stability
해결 방법
①Hot air circulation oven annealing at 110-130℃ for 2-4 hours, add 0.5 hour for every 1mm increase in thickness; ②Slow cooling after annealing ≤20℃/h; ③Annealing temperature takes 10-20℃ below the heat deflection temperature
핵심 요약
Annealing is the standard post-treatment for PC to eliminate internal stress; temperature, time, and slow cooling three parameters are executed per specification, never fast-cool and waste previous efforts；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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