One of the most common things I hear when troubleshooting a curing process is:
“We didn’t change anything.”
Maybe not intentionally, but manufacturing processes are constantly changing.
- A heavier part.
- A different color.
- A new powder chemistry.
- A different supplier lot.
- Parts hung closer together.
- A change in line loading.
- Even seasonal changes in temperature and humidity.
The oven settings may be exactly the same, but the process isn’t. And that’s what matters.
Every change affects how thermal energy moves through the system.
Some changes are obvious, others are so small they’re easy to overlook, but they all influence the coating’s thermal history. That’s why two parts can travel through the same oven at the same temperature, for the same amount of time, and produce very different results.
Not because the oven changed. Because the process changed.
That’s why I rarely start troubleshooting by looking at the controller. I start by asking,
“What changed?”
Sometimes the answer surprises everyone.