
In the middle of the night shift, a batch of light-gray plastic emerged, streaked with debris. The machine operator took one look and did what came most naturally: he cranked up the screw speed and increased the back pressure to ensure the orange-colored pellets melted completely. By morning, the color was indeed more uniform. A few weeks later, the customer returned the entire shipment the products had become brittle, cracking at the slightest impact, and the color varied from one delivery to the next, failing to match the approved standard




