Injection Molding
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PA12 Low-viscosity Grade Molding Precision
Problem Phenomenon
【Problem phenomenon】Low-viscosity PA12 (such as Vestamid L1670) drooled and stringed during '2079851475616104452, and dimensional precision was difficult to control
Cause Analysis
Low-viscosity grades have excellent melt fluidity, and ordinary open nozzles easily drool and contaminate the cavity; medical catheter processing materials recommend using needle valve nozzles to improve the molding precision of low-viscosity grades
Solution
Equip low-viscosity grades with needle valve nozzles to control opening and closing; execute drying and temperature according to the 180-220℃ low-temperature window; optimize the suck-back stroke to assist in preventing drooling; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low-viscosity PA12 equipped with a needle valve nozzle is the guarantee of precision, and open nozzles are hardly competent; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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