Injection Molding
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Short shot of PP thin-wall lunch boxes
Problem Phenomenon
The edges or corners of thin-wall lunch boxes are incompletely filled, and the short shot rate rises during high-speed production.
Cause Analysis
When the wall thickness is less than 1mm, the flow length-to-thickness ratio far exceeds the conventional level, and the melt front cools and solidifies rapidly; insufficient injection speed or pressure and low melt temperature all cause short shots.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Increase the injection speed and pressure; ②appropriately increase the melt temperature; ③select a high-melt-index special grade for thin walls; ④optimize the gate layout to shorten the flow length.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
The core contradiction of thin-wall '2079851475616104452 is the race between rapid filling and rapid cooling; high speed, high melt temperature, plus a high-flow grade is the standard solution.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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