Dear AllStaters,
I have a problem and I'm not quite sure on how to solve it.
What I need is to compute for an overall variation. Here is the
situation:
A pack bar of soap contains dye solution. But this dye solution comes from
different sources:
1. A dye solution batch is made. Variation is introduced due to the batch to
batch variation in dye concentration.
2. At some point in the soap process, dye solution from #1, is added to
the soap. Another source of variation is introduced because the flow rate
in the addition varies. #1 and #2 happens in the making area.
3. In packing, we take dye solution from #1 and add more raw material
to it (e.g. preservative and water). This new batches of diluted solution
varies again because of a varying amount of water addition.
4. The solution in #3 is added to soap as it is packed. The addition
rate also varies another source of variation.
Soap processing is a continuous process as opposed to batch. So the dye addition
is continuous but are made in batches. We are collecting data for the amount of
dye in the soap. Time interval is every two hours, i.e.. amount of dye that is
in the soap made every two hours. How can I compute for the total variation
(from #1, #2, #3 and #4)? I trust you can help me with this...Thanks.
Here is a typical data...data taken every 2 hours:
Dye batch used From batch Diluted from batch
Time (concentration) 1st dye addition 2nd dye addition
8 AM 1.05% 24 lbs 10.0 lbs
10 AM 1.05% 24 lbs 9.25 lbs
12 AM 0.998% 24 lbs 10.01 lbs
. . . .
. . . .
Any help or lead is greatly appreciated and thank you very much in
advance.
Kind regards,
Don
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