Extrusion & Post
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PA12 Medical Catheter Multi-segment Composite Molding
Problem Phenomenon
【Problem phenomenon】Nylon support segment + Pebax flexible segment composite catheter had poor interfacial bonding and delaminated during use
Cause Analysis
Multi-segment material integrated catheters rely on a setting temperature of 105-120℃ to ensure interfacial bonding strength; insufficient temperature causes weak interfacial diffusion bonding, and too high damages the material
Solution
Lock the setting temperature of composite catheters at 105-120℃; include interfacial bonding strength in tensile sampling inspection; control the processing temperature of each segment material according to its own window; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Composite catheter interfacial strength lies in the 105-120℃ setting window, and sampling inspection cannot be omitted; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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