1. Process parameters and product characteristics to be controlled
1.1 Process parameters
To control a process, it is necessary to work on the parameters of that process rather than on the characteristics of the product, i.e., to identify cause-and-effect relationships and quantify them at least roughly (for example, the effect of temperature on the viscosity of a polymer).
Various tools can be used for this research, including:
failure tree or cause tree;
cause-and-effect diagram (also known as a "fishbone diagram" or "Ishikawa diagram");
correlation and regression studies;
experimental designs;
data analysis: principal components......
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Process parameters and product characteristics to be controlled
Process variability
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