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Status:Open    Asked:Nov 30, 2012 - 01:27 PM

Can you recommend a test procedure that can evaluate seal integrity of plastic bags in PSI?

I have 22 different sized LLDPE 3mil bags used for product where I work (smallest 14.38” W x 34.00” L, largest 40.00” W x 70.00” L). We place compressed flex-duct material into the bags (not sure of the force being applied by the product) – envision the ‘springy-snakes-in-a-peanut-can-effect’ should we have a bag pop open. We have been experiencing seam failure/bag failure to the point where we have a deviation in place to hog tie the seamed ends for now – in other words, we do not trust the strength of the seams our supplier is producing.

Currently we have no formal, internal, testing to document bags/seal integrity. I’d like to better understand the amount of force the product is applying to the bag (PSI) 1 st , and compare to a PSI type measurement with the bag. Our product engineers are coming up with a method to do this for the product. From a bag material testing standpoint, I’m in need of some perspective – I’ve been envisioning a tensile test on cut and conditioned samples of the bag material (cross dir./machine dir./seam specific – dry heat/moist heat/cold/nominal). I’m looking for any other testing documents or method of approaches to consider? Other than what I’m thinking of? The seal widths on the 22 bags seem to have no consistency.. ranging from 1/8” to 5/8”; we’ve requested standardization of all seals to ¼” (+- 1/8” tolerance) as a 1 st step, to be continuously improved upon as we learn and define more detail per our specifications. Also, what's a good method of approach to inspect the bags upon arrival in one of our facilities to ensure compliance? Is there a better method of approach than what I'm doing? Are there existing test procedures

I’m unaware of? Also, what’s a good method of approach to inspect the bags upon arrival in one of our facilities to ensure compliance?

How would ISTA recommend approaching this quality issue per testing procedures, and seal width integrity, testing and specifying?

Thank you –

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