Molds & Tooling
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PA6 Thick-Walled Part Mold Temperature Increase
Problem Phenomenon
PA6 thick-walled products have severe surface sink marks, and improvement is limited after increasing the holding pressure
Cause Analysis
When the mold temperature of thick-walled parts is low, the surface layer solidifies quickly, the feeding channel for the core melt freezes prematurely, the holding pressure cannot be transmitted in, and sink marks are difficult to eliminate through holding pressure; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Raise the mold temperature of thick-walled PA6 products to 80-90°C to delay surface solidification, combined with sufficient holding pressure and time; when necessary, enlarge the gate to keep the feeding channel open
Key Takeaway
The root of sink marks in thick-walled parts is the feeding channel, and only high mold temperature plus effective holding pressure can solve it; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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