I’ve talked in past columns about the four evils of overheating: Polymer degradation, cooling problems, sizing problems and the effect on additives. Summertime seems like a good time to revisit and expand on this theme.
To estimate the value of a used extrusion line, invoke the rule of thirds: Offer the seller one-third of the cost of a new line similar to the used one and set aside another third to fix what’s broken and for shipment expenses. The final third is your reward for buying used.
When monitoring the vital signs of the extrusion process—melt temperature, melt pressure and motor load—it’s critical to know where you are measuring, what to expect and what may throw off the results.