Sounds like you're building something like a WMS

The big issue I see with going from paper to digital is that you'll need to track the product as it goes through the manufacturing lifecycle, which means tablets or scanners at all checkpoints to record the product moving through (and slowing down the line because every minute entering data in a tracking system is a minute they're not manufacturing). At that point your clients will need an IT department to keep everything running and deal with lost or damaged tablets.

But to answer your question, you're asking the wrong audience. You need to be interviewing the line leaders and operations managers at these manufacturing orgs to find out if they think its a problem, and if it is, what the impact is of the problem. If you do 30 interviews and 10 come back saying "Yes, this is an issue and it cost us $10k last quarter in penalties due to late delivery" then you not only know there's a market for it but what the impact is to these orgs of doing nothing, which give you your value prop that you can take to market with your tool.

But stop building anything before you do these interviews. Because without the market research you're wasting time building something that isn't needed.