
21The Process, the Product, and Its Ultimate Life Span
• Carefully engineered product properties will gradually change in
storage.
• Process dependency can manifest problems in many subtle ways.
• Process issues are interactive and cannot be addressed in isolation.
Process disruption
due to raw
material variability
Commercial production
and the ongoing
refinement of the
production process
In-house
testing
Fitness
testing
Product
cost
Material
specifications
Cannot be stopped
and restarted easily
Nonreversible
Changes/evolves
over time
Raw
materials
Process
equipment
- Size/residence time
- Batch vs. continuous
- Control system
- Heat source
- Wear/corrosion
Dynamic process ...