Hello everyone,
I have a question regarding the sample size of an in-process control and the resulting batch release. Since the product is just a folded, dry wipe in a sachet (low risk overall, deviations in the folding or in the size are hardly relevant to safety), that has been in production for more than 15 years - sample size was always 50 pieces - I would like to stay with such a low sample size, but at least be able to justify it accordingly or slightly adapt it.
According to ISO 2895, I would have to take 500 samples for a batch size of 35.500 pieces, if I take the batch size range below (because I only slightly exceed this), I still have to pick 200 samples. If I could use one of the special levels as a basis here, that would be great. Unfortunately, I can hardly find a definition of when and to what extent they can be used. Can anyone give me a hint, where I can finde more details/definitions?
In my case, I am thinking, if its possible to check 200 or 500 pieces, for example, for integrity of the packaging, proper printing etc. and then add these samples back to the batch (assuming they are in spec) and then use just a part of them and with an amount according to the special level, to open the packs and check the content? Until now we took 50 samples, open them and check if the wipe size is correct and folded properly. Checking the integrity of the packaging and printing is included and done before opening, but as this could be easily done and the samples used afterwards (if allowed to do so?) checking 200 would be acceptable.
Even if the value of the larger number of samples is not that high, it is still annoying when it ends up in the garbage afterwards, esp as there are actually hardly any errors here and, above all, no relevant ones. In this respect, it is certainly acceptable to reduce the sample size, the main question is according to which specifications and to what extent.
I would be happy to get some feedback about my thoughts for testing or new ideas, where to look for more information or suggestions or literature recommendations.....
Thanks a lot in advance
I have a question regarding the sample size of an in-process control and the resulting batch release. Since the product is just a folded, dry wipe in a sachet (low risk overall, deviations in the folding or in the size are hardly relevant to safety), that has been in production for more than 15 years - sample size was always 50 pieces - I would like to stay with such a low sample size, but at least be able to justify it accordingly or slightly adapt it.
According to ISO 2895, I would have to take 500 samples for a batch size of 35.500 pieces, if I take the batch size range below (because I only slightly exceed this), I still have to pick 200 samples. If I could use one of the special levels as a basis here, that would be great. Unfortunately, I can hardly find a definition of when and to what extent they can be used. Can anyone give me a hint, where I can finde more details/definitions?
In my case, I am thinking, if its possible to check 200 or 500 pieces, for example, for integrity of the packaging, proper printing etc. and then add these samples back to the batch (assuming they are in spec) and then use just a part of them and with an amount according to the special level, to open the packs and check the content? Until now we took 50 samples, open them and check if the wipe size is correct and folded properly. Checking the integrity of the packaging and printing is included and done before opening, but as this could be easily done and the samples used afterwards (if allowed to do so?) checking 200 would be acceptable.
Even if the value of the larger number of samples is not that high, it is still annoying when it ends up in the garbage afterwards, esp as there are actually hardly any errors here and, above all, no relevant ones. In this respect, it is certainly acceptable to reduce the sample size, the main question is according to which specifications and to what extent.
I would be happy to get some feedback about my thoughts for testing or new ideas, where to look for more information or suggestions or literature recommendations.....
Thanks a lot in advance