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PET preform molds · Hot runner

Hot runner systems for PET preform molds.

The runner, the gate and the cooling around that gate are reviewed with the mold. A cavity count by itself does not describe the system.

Close view of a 64 cavity needle-valve hot runner layout for a PET preform mold
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The published molds use a needle valve.

OSLON's 64-cavity and 72-cavity PET preform records both specify a needle-valve hot runner. That is what those mineral water tools were built with. A heavier preform, a larger neck or a much lower cavity count is a reason to choose again.

An open gate relies on temperature at the tip. A valve gate uses a pin that stays open through filling and holding, then seats before the mold opens. On preform tools the pin is commonly driven by air. Confirm that, because the air supply is part of the mold.

Flow layouts

Cavity scale is a starting point.

These references show how a manifold is discussed at 24, 48, 64, 72 and 96 cavities. Balance, bore and the bends from the machine nozzle are set for the preform you send. They are not copied from the picture.

24 cavity PET preform hot runner layout rendering
24 cavity flow layout
48 cavity PET preform hot runner layout with flow reference labels
48 cavity flow layout
64 cavity needle-valve hot runner layout for a PET preform mold
64 cavity layout
72 cavity PET preform hot runner layout rendering
72 cavity flow layout
96 cavity PET preform hot runner layout rendering
96 cavity flow layout

Questions

What the hot runner line on a quotation should answer.

What hot runner is on the published PET preform molds?

Both documented projects use a needle-valve hot runner. The 64-cavity mold is a 14 g, 29/25 preform on a Yizumi 320T. The 72-cavity mold is a 14 g, 30/25 preform on a Yizumi 480T. Those records are not a rule that every mold must use a valve gate.

When is an open gate still the right choice?

An open gate closes on temperature. A valve gate closes with a pin. The pin gives a smaller vestige and a shut-off during a stop, and it adds pins, seals and, when the pin is pneumatic, an air supply. A lower cavity count, or a preform where that maintenance is the wrong trade, can still be an open-gate job.

Are the cavity layouts a finished hot runner design?

No. The 24, 48, 64, 72 and 96 cavity images are flow-layout references. Manifold balance, zone count, controller supply and nozzle service access are confirmed against your preform and machine.

What should two hot runner quotations both state?

Gate type, whether the manifold is balanced for that cavity count, how many zones there are, whether the controller is included, and which spares ship in the crate. Two offers that both say hot runner can still be different systems.

Start with confirmed project data

Send your preform drawing and production target.

Discuss your project
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