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Fabric roll inspection - What type of Control Chart to use?

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AMIT BALLAL

Trusted Information Resource
#2
It depends on the type of data & subgroup size.
If your data is variable and subgroup size is 1, you can use a Xbar-R chart. Subgroup size 2 to 9, Xbar-R chart, Subgroup size of 10 or more - use Xbar-s chart.
If your data attribute, you can use p (for varying sample size) or np (for constant sample size) chart for defectives and for defects, you can use c (constant sample size) or u (varying sample size) chart.

Please give more details to answer your question better.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#3
Is this in processs inspection? Or inspection after the roll is finished?

Are there things you add to the roll material as it being fabricated before the final roll format? (Color, binders, other chemical additives, etc.) Are these effecting the characteristics you are inspecting for in the roll? Are there material lot/batch changes that might change while the roll is being made?

Do you know how your inspection characteristics vary across the roll and down the roll?
 
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