Molding Process
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Extremely low strength at the weld line
Problem Phenomenon
The tensile strength at the weld line of PEEK products is only 30-40% of the base material
Cause Analysis
The temperature drops sharply at the melt convergence, causing insufficient molecular chain diffusion and entanglement; PEEK molecular chains are rigid, with diffusion rate far lower than flexible chains; the convergence surface cools quickly
Solution
Increase the mold temperature to above 200°C to extend the fusion window of the weld surface; optimize gate design to minimize the number of weld lines; use sequential valves to control the melt convergence timing
Key Takeaway
PEEK weld lines are the main weak link in the product structure
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