Material Drying
7 조회수
PA66 extruded rods and plates
문제 현상
Extruded PA66 rods have center bubbles and surface ripples, and internal looseness after machining
원인 분석
Rods have large wall thickness, the outer layer cools first and center feeding is insufficient, forming shrinkage voids and bubbles; micro-bubbles from insufficient drying also remain in the center; extrusion temperature fluctuation causes surface ripples; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
해결 방법
①Fully dry the raw material to moisture content ≤0.15%; ②Sizing sleeve slow cooling to reduce inner-outer temperature difference; ③Extrusion temperature stable within ±2℃ fluctuation; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
핵심 요약
The internal quality of PA66 rods relies on dual control of drying and slow cooling; once center shrinkage voids form they cannot be remedied, prevention is the only means; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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