Breviary Technical Ceramics






10.6.3 Statistical Process Control

SPC is a method for continuously improving processes and products. SPC is an abbreviation of Statistical Process Control.
Process is understood to refer to any repetitive operation. The SPC method is thus also applicable, for instance, to procurement, sales, engineering, research and development, production and management.

SPC serves

  • as proof of quality production,
  • process control and
  • systematic diagnosis for the analysis and solution of problems with the purpose of continuous quality improvement.

The control card technique is an important tool for SPC.

A process that displays only natural variability is stable and predictable. Such a process is, in other words, under statistical control. A process of this type is an important precondition for achieving the highest quality. A process that also contains unnatural variability is unstable and unpredictable. Such a process is not under statistical control. The unnatural variability occurs without warning, with unknown duration but will inevitably reoccur sometime. With the help of control cards it becomes possible to track down the cause of the unnatural variability. The effectiveness and permanence of the correction can be proven using control cards.

Figure 236: SPC and quality assurance systems


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