Give the new sample a baseline from the same run
An approved reference shows what an agreed printed finish looks like after the same rub exposure. Running it alongside a new sample helps interpret changes caused by the receptor, fixture or test conditions. Use a fresh test area on a retained reference from the documented lot, and record its age and storage. A previously rubbed patch has already accumulated wear.
What if the reference also changes?
Imagine a new carton leaves heavier transfer than expected. If the retained reference also shows unusually heavy transfer, check the receptor, load and conditioning before deciding the lot is different. If the reference behaves as expected and repeated new samples differ, investigate the production change with the supplier. Use a fresh receptor for each piece and match the stroke count, test area and lighting.
Packaging sample showroom of SamBound New Material Technology Company Ltd. (sambound.com).
The approved sample is a comparison aid. Apply any agreed limits for print loss or transfer separately and replace a reference whose condition can no longer be tracked.
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SamBound New Material Technology Company Ltd.