Molds & Tooling
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Insufficient PPO Weld Line Strength
Problem Phenomenon
The weld line strength of PPO multi-gate products is low, cracking occurs under stress, and the confluence area has both appearance and performance defects.
Cause Analysis
The high-viscosity PPO melt fronts do not converge and entangle sufficiently; low mold temperature cools the melt front; poor venting weakens the interface; gate layout places the weld line in the stressed area.
Solution
①Increase mold temperature and injection speed to strengthen convergence; ②strengthen venting in the confluence area; ③adjust gate layout to move the weld line position; ④use overflow wells if necessary to improve interface quality.
Key Takeaway
PPO weld line treatment mainly relies on temperature and speed; gate layout determines the position at the design stage; overflow wells are an effective means for load-bearing parts.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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