Molds & Tooling
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PLA slow crystallization rate and long molding cycle
Problem Phenomenon
Products are soft and deform after demolding; long cooling time and low efficiency.
Cause Analysis
PLA has a slow crystallization rate; under conventional cooling, crystallinity is low and setting is insufficient; low crystallinity also limits heat resistance.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Add nucleating agents to promote crystallization; ② increase mold temperature to 90~110℃ for heat setting; ③ select high-crystallinity grades; ④ extend setting time.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA slow crystallization is a dual bottleneck of efficiency and performance; nucleating agents plus hot mold setting are the industry standard combination.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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