PT ZONE: Hot Runners

PT Article Priamus Joins Stable of Hot-Runner Suppliers
Three hot-runner makers and a controls supplier come under the same umbrella. More (+)
TOOLING: Designing Molds for Easy Maintenance in the Press, Part 1
Attention to design of cooling, ejection, and slides can save downtime and maintenance headaches. More (+)


Save the Date: Molding 2016, March 29-31

Industry’s preeminent technical conference on injection molding will have broader appeal next year.

How to Optimize Pack & Hold Times for Hot-Runner & Valve-Gated Molds

Using scientific procedures will help you put an end to all that time-consuming trial and error. Part 1 of 2.

INJECTION MOLDING: Hot-Runner Nozzle Heaters Get More Compact Clamping Mechanism

Easier to work with in confined spaces.

Servo Valve-Gate Control Helps Auto Parts Weigh Less & Look Their Best

More uniform and lower pressure makes a thinner, better part.

Shiny New Hot-Runner Plant Is High Tech Showplace

HRSflow employs automation, sophisticated software tools in its first North American production plant.

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Hot Runners


A hot runner system is an assembly of heated components—hot halves, nozzles and gates and—that inject plastic into the cavities of an injection mold. The system usually includes a heated manifold and a number of heated nozzles. The manifold distributes the plastic entering the mold to the nozzles, which then meter it precisely to the injection points in the cavities. The hot runner is equipped with its own temperature control system.

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» Purging Compound

Sooner or later you will need to purge your machine. Which material should you use to purge your screw and barrel?

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