Injection Mold Design Guide: _best_
When molten plastic (300°C) rushes into a cavity, it compresses the air in front of it. Compressed air heats up—sometimes to 600°C. That burns the plastic, creating “dieseling” marks: black, carbonized spots.
When molten plastic (300°C) rushes into a cavity, it compresses the air in front of it. Compressed air heats up—sometimes to 600°C. That burns the plastic, creating “dieseling” marks: black, carbonized spots.