Lab-based Quality Control means the production line makes product, a sample is taken to the lab, one or more tests are done, some tests may take hours, days or even a week, the results are reviewed and then materials or process conditions are adjusted to keep product on-spec.
Unfortunately, in an operation such as this a LOT of off-spec product can be produced before you even know that you have a problem. Product that needs to be reworked, recycled, downgraded or just tossed.
You need a way to see and control quality directly on the production line itself.