Statistical Process ControlSPC

Nutrition Supply ForumNovember 5th-6th, 2019

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One objective : a product that meets specifications

“Regular” way

“New” way

Analysis of finished products

Trend analysis

Statistical Process Control

REAL-TIME

What is SPC?

Benefit :The main objective is to be able to guarantee quality control with a preventive method, without the need for individual analyses to release the products

SPC allows us to- Respond to clients expectations- React immediately- Improve the performance of a manufacturing process- Decrease the number of analyses on finished products- Decrease costs

History : automotive industry, metal industry, munitions factories, aeronautic industry…

Definition : method to control a manufacturing process, thanks to both statistical tools and the way they are used

How to implement SPC?

1st step : Evaluate the capability of the manufacturing process

2nd step : Control a manufacturing process thanks to Control Charts

How to implement SPC – Prior steps?

Scope

Qualification of equipment

Reliability of measuring tools (metrology, reliable method of analysis)

Implement measuring sensors and use statistical tools

Involvement of Top management and training of people

Process capability

Definition : ability of the process to meet the specifications of a product.

Design specification = nominal value + tolerance

Process capability

Indexes : Cp, Cpk

Normal Distribution

Potential Index Performance Index Cpk

Control charts

Statistical Process Control tool, used to study how a process changes over time

Cp =

Cpk =

Control charts

Statistical Process Control tool, used to study how a process changes over time

Cp =

Cpk =

Control charts

Statistical Process Control tool, used to study how a process changes over time

Control charts

Statistical Process Control tool, used to study how a process changes over time

Benefit of control charts

- To make real-time decisions and decrease the non-compliant products

- To identify causes of deviation

- To improve the process or demonstrate the improvements

Conclusion

SPC : method to control a manufacturing process, thanks to statistical tools

The 2 main steps ;- Capability of the manufacturing process, - Control ChartsAnd many prior steps

Expensive

Deserves serious consideration : quality control to detect deviation instead of default

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