The difference between the injection molding hot runner and cold runner system of Plastic Fan Mold Manufacturers

hot runner
Hot gate/runner systems use electrically heated cylinders to deliver preheated plastic into the mold cavity. The runners are built into the mold in the form of manifold plates and many hot runner drops.

benefit:

Precise temperature control for better finished appearance
Eliminate multi-cavity tool waste
Reduce cycle time

shortcoming:

more complex and expensive

cold runner
Cold runner systems are less expensive, but the length of the runner represents the plastic that is wasted with each cycle, which in turn increases the cost. Moving the witness marker to a more favorable location should be balanced against increased material consumption due to longer runners.

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