Extrusion & Post
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PCL low melt strength stringing
Problem Phenomenon
PCL has low melt strength during extrusion or printing, severe stringing, and poor surface finish.
Cause Analysis
PCL has low melt strength; stringing is prone to occur during high-speed extrusion; the melt stays in the nozzle too long and thermally degrades; bubbles and impurities are generated; printing accuracy decreases.
Solution
①Extrusion or printing speed control; ②Nozzle temperature management; ③Shortening of melt residence time; ④Retraction or wiping mechanism; ⑤'2079851475616104451.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PCL stringing is a direct manifestation of low melt strength; speed and temperature management; mechanism assistance improves the surface.；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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