Production Ramp-Up: The Invisible Bottleneck Curve

量产爬坡：看不见的瓶颈曲线

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Ramp-up velocity isn’t linear; it follows a sigmoid curve shaped by operator fatigue, material batch variability, and line-balancing refinements.
The first 5% defect rate at launch often drops to 0.3% by week three—not from better training, but from tacit knowledge transfer among line workers.

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