Extrusion & Post
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PVDF Piezoelectric Film Stretching and Polarization Process
Problem Phenomenon
【Problem Phenomenon】After stretching and polarization of PVDF piezoelectric film, the piezoelectric constant fluctuates greatly between batches
Cause Analysis
β phase content and orientation degree determine piezoelectric performance; slight drift in stretching ratio, temperature and polarization electric field parameters is amplified into performance fluctuation; film processing and polarization must be controlled as one
Solution
Lock the three elements of stretching ratio, temperature and speed and monitor online; close the loop of polarization electric field and temperature according to the procedure; incorporate batch-to-batch raw material molecular weight differences into feedforward adjustment; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Piezoelectric film performance lies in the stretching polarization window, and parameter closed-loop is the premise of batch stability; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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