Molding Process
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PA66 wall thickness design specifications
Problem Phenomenon
Thin-wall areas are underfilled, thick-wall areas have sink marks and vacuum bubbles, and the two difficulties coexist in the same product
Cause Analysis
PA66 flow length ratio is 150-200, wall thickness should not be less than 0.8mm, and conventional selection is 1-3.2mm; wall thickness differences make solidification time and shrinkage uneven, and short shots at thin areas and sink marks at thick areas appear simultaneously
Solution
①Control wall thickness at 0.8-3.2mm and make it as uniform as possible; ②Transition slope from thick wall to thin wall ≤1:3; ③Rib thickness not exceeding 60% of the main wall thickness; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 wall thickness design has a clear window; uniform wall thickness plus gentle transition is the fundamental means to resolve short shots and sink marks simultaneously from the structural end; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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